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DIY VACUUM TUBE (VALVE) AMPLIFIER PROJECTS The 6DJ8 tube headphone amplifier is suitable for use with many Hi-Fi headphones. Output power is over 100 mW between 32 ohms to 300 ohms. The response is 20 Hz to 28 kHz within 0.5 dB and the wide band signal-to-noise is -84 dB. DIY EL84 Push-Pull (Class-A, Ultra-Linear) Amplifier - 30 September 2012. LM317 / LM338 / LM350 CURRENT REGULATOR CALCULATOR AND LM317 / LM338 / LM350 Current Regulator Calculator. You can use this Current Regulator Calculator to vary the value of the program resistor (R 1) and calculate the output current from the LM317 / LM338 / LM350 family of three terminal adjustable regulators. This Current Regulator Calculator will work for all adjustable integrated circuit DIY LIGHTSPEED ATTENUATOR Photograph 7: Finished Lightspeed Passive Attenuator. The cost for my DIY Lightspeed Attenuator was about $40-50US, $30 of which went towards the matched set of optocouplers. If you are interested in higher quality volume controls, this is a very good project toconsider.
OATLEY K272 JAN 6418 VALVE (TUBE) PREAMPLIFIER / HEADPHONE Update Feb 2010: Oatley Electronics has introduced an updated version of this kit, the K272A.See the 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) thread for more info.. Update May 2010: Oatley Electronics has introduced a phono preamp kit, using the same 6418 valves.See my build of the Oatley Electronics K282 6418 Valve RIAA Phono Preamplifier Kit. VACUUM TUBE POWER SUPPLY DESIGN LOW-INDUCTANCE DIY BRAIDED HI-FI SPEAKER CABLES Low-Inductance DIY Hi-Fi Speaker Cables. The 1.618wr speaker cables turned out well and I thought I would share the instructions and results. I am using these DIY low-inductance speaker cables with my DIY Hi-Vi 3-Way Speakers.The speaker cables use 16AWG strnaded copper wire, a total of 4 x 16AWG wires for each speaker cable conductor which give an equivalent AWG of 10 (see American GOBO STEREO AUDIO AMPLIFIER KIT (LM1875, 15W, CLASS-AB The Gobo amplifier kit is a complete kit in that it includes all the necessary parts and enclosure required to build a complete stereo amplifier. The LM1875 amplifier kit is easy to build armed with just soldering skills and the detailed step-by-step instructions. The amplifier kit comes with audio-grade capacitors and toroidaltransformer.
DIY ECC802S (12AU7 / ECC82) VACUUM TUBE SRPP PREAMPLIFIER The DIY version of the ForeWatt tube preamp. The preamplifier uses the 12AU7 family of tubes that also includes ECC802S and ECC82 valves. Thepreamp uses a
JORDAN JX92S FULLRANGE LOUDSPEAKER DRIVER / TRANSDUCER Jordan JX92S Fullrange Speaker Driver (Transducer) Note - this driver has been discontinued and is no longer being produced. The Jordan JX92S is a 5" metal cone fullrange driver which is listed by the manufacturer as having an X max of 9 mm. DIY AND HI-FI AUDIO SCHEMATICSLACEWOODST35DYNACO A420 TRANSFORMER2A3 SINGLE-ENDED TRIODEST70 This is our collection of DIY and Hi-Fi Audio Schematics. Feel free to send us your hi-fi audio schematics and we will add them here. If you have built any of these circuits, we would love to hear from you so send us your comments. Many of these diy Audio Books contain schematics. You can also find more schematics through some of thesites
DIY VACUUM TUBE (VALVE) AMPLIFIER PROJECTS The 6DJ8 tube headphone amplifier is suitable for use with many Hi-Fi headphones. Output power is over 100 mW between 32 ohms to 300 ohms. The response is 20 Hz to 28 kHz within 0.5 dB and the wide band signal-to-noise is -84 dB. DIY EL84 Push-Pull (Class-A, Ultra-Linear) Amplifier - 30 September 2012. LM317 / LM338 / LM350 CURRENT REGULATOR CALCULATOR AND LM317 / LM338 / LM350 Current Regulator Calculator. You can use this Current Regulator Calculator to vary the value of the program resistor (R 1) and calculate the output current from the LM317 / LM338 / LM350 family of three terminal adjustable regulators. This Current Regulator Calculator will work for all adjustable integrated circuit DIY LIGHTSPEED ATTENUATOR Photograph 7: Finished Lightspeed Passive Attenuator. The cost for my DIY Lightspeed Attenuator was about $40-50US, $30 of which went towards the matched set of optocouplers. If you are interested in higher quality volume controls, this is a very good project toconsider.
OATLEY K272 JAN 6418 VALVE (TUBE) PREAMPLIFIER / HEADPHONE Update Feb 2010: Oatley Electronics has introduced an updated version of this kit, the K272A.See the 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) thread for more info.. Update May 2010: Oatley Electronics has introduced a phono preamp kit, using the same 6418 valves.See my build of the Oatley Electronics K282 6418 Valve RIAA Phono Preamplifier Kit. VACUUM TUBE POWER SUPPLY DESIGN LOW-INDUCTANCE DIY BRAIDED HI-FI SPEAKER CABLES Low-Inductance DIY Hi-Fi Speaker Cables. The 1.618wr speaker cables turned out well and I thought I would share the instructions and results. I am using these DIY low-inductance speaker cables with my DIY Hi-Vi 3-Way Speakers.The speaker cables use 16AWG strnaded copper wire, a total of 4 x 16AWG wires for each speaker cable conductor which give an equivalent AWG of 10 (see American GOBO STEREO AUDIO AMPLIFIER KIT (LM1875, 15W, CLASS-AB The Gobo amplifier kit is a complete kit in that it includes all the necessary parts and enclosure required to build a complete stereo amplifier. The LM1875 amplifier kit is easy to build armed with just soldering skills and the detailed step-by-step instructions. The amplifier kit comes with audio-grade capacitors and toroidaltransformer.
DIY ECC802S (12AU7 / ECC82) VACUUM TUBE SRPP PREAMPLIFIER The DIY version of the ForeWatt tube preamp. The preamplifier uses the 12AU7 family of tubes that also includes ECC802S and ECC82 valves. Thepreamp uses a
JORDAN JX92S FULLRANGE LOUDSPEAKER DRIVER / TRANSDUCER Jordan JX92S Fullrange Speaker Driver (Transducer) Note - this driver has been discontinued and is no longer being produced. The Jordan JX92S is a 5" metal cone fullrange driver which is listed by the manufacturer as having an X max of 9 mm. DIY AND HI-FI AUDIO SCHEMATICS This is our collection of DIY and Hi-Fi Audio Schematics. Feel free to send us your hi-fi audio schematics and we will add them here. If you have built any of these circuits, we would love to hear from you so send us your comments. Many of these diy Audio Books contain schematics. You can also find more schematics through some of thesites
OP-AMP BASED RIAA PHONO PREAMP FOR MM AND MC PHONO CARTRIDGES Design Considerations - Op-amp based Phono Preamp. The circuit is a non-inverting IC based filter with significant gain. Four of the components in the feedback loop determine the proper RIAA compensation. Slight variation in any of them is unlikely to be audible. The remaining components determine the gain and are forstability.
PHONO PREAMP KI.
Phono Preamp Ki. The cct. brd was assemble and the ABS plastic case drilled ready for assemble. ABS is a very hard plastic to drill. HIRAGA MC PHONO PREAMPLIFIER Hiraga MC Phono Preamplifier Finding I liked Moving Coil cartridges I tried my hand at yet another MC preamp. SINGLE-ENDED 833 MONOBLOCK TUBE AMPLIFIER Single-Ended 833 Monoblock Tube Amplifier I have built a monoblock 833 SET tube amplifier with zero feedback and a fixed bias. LE PACIFIC JFET PHONO PREAMP FOR MM AND MC CARTRIDGES Figure 1: Le Pacific JFET Phono Preamplifier Schematic. This is a strip board construction using brown polypropylene caps from the local electronics store. The large electrolytic capacitor is 10,000uF fed by a 1 ohm resistor. Wire wrap wire is used as hook-up wire. Silver based solder, gold RCAs and all installed in an embossed gold chocolatesbox.
DIY ECC802S (12AU7 / ECC82) VACUUM TUBE SRPP PREAMPLIFIER The DIY version of the ForeWatt tube preamp. The preamplifier uses the 12AU7 family of tubes that also includes ECC802S and ECC82 valves. Thepreamp uses a
DIY SHIELDED RCA INTERCONNECT CABLES DIY Shielded RCA Interconnect Cables. This project is a guide to build your own simple high quality RCA interconnect cables for your Hi-Fi audio system. These "better DIY RCA interconnects" are unbalanced and made using shielded instrument cable and high quality RCA plugs. This is a fairly easy DIY cable project and one stereo pair of DIY SMALL FOSTEX FULLRANGE SPEAKER MODIFICATIONS AND TWEAKS The modifications and tweaks are generally focused around the idea that the light-weight stamped steel chassis can "ring". These modifications and tweaks are suitable for the Fostex (FE83En, FE103En, FE126En, FF85WK, FF105WK, FF125WK) drivers and can likely be applied to similar small speaker drivers that also use a stamped steelchassis.
LOUDSPEAKER DIFFRACTION LOSS AND BAFFLE STEP COMPENSATION Loudspeaker Diffraction Loss and Baffle Step Compensation Circuit. At high frequencies, a loudspeaker radiates sound directly forward inhalf space.
PUSH-PULL (PP) EL84 TUBE AMPLIFIER SCHEMATIC (ECC83 INPUT) Push-Pull (PP) EL84 Tube Amplifier Schematic (ECC83 input) Push-Pull (PP) EL84 Tube Amplifier Schematic with ECC83 input stage. The tube rectified power supply uses an EZ81 tube. KT120 PUSH-PULL TUBE AMPLIFIER SCHEMATIC (ODDWATT AUDIO OBHO) This KT120 push-pull amplifier is a class-A, ultra-linear design with a self-inverting output stage, much like the other ones posted in previous projects. The amplifier will deliver approximately 45 watts RMS with a bandwidth of 10 Hz to 25 kHz +/- 0.5 dB (with the negative feedback engaged). Distortion is under 1% at half power and gradually LE PACIFIC JFET PHONO PREAMP FOR MM AND MC CARTRIDGES Figure 1: Le Pacific JFET Phono Preamplifier Schematic. This is a strip board construction using brown polypropylene caps from the local electronics store. The large electrolytic capacitor is 10,000uF fed by a 1 ohm resistor. Wire wrap wire is used as hook-up wire. Silver based solder, gold RCAs and all installed in an embossed gold chocolatesbox.
EMINENCE ALPHA-15A
The Eminence Alpha-15A is a 381 mm (15") diameter paper cone woofer. Eminence recommends the Alpha-15A driver for professional audio and bass guitar applications as a woofer in a vented or sealed enclosure. The woofer has a high Q ts and works very well with open baffle speaker designs. We have found the Alpha-15A to be a cost effectiveand
JEAN HIRAGA'S SUPER CLASS-A AMPLIFIER My version of the Jean Hiraga Super Class-A Amplifier is running at a bias of about 1.65A @ 35V resulting in about 58W of continuous dissipation per transistor in the output stage (just over 1/3 their rating of 150W). As you can imagine, the heat sink runs quite hot, approximately 40 Celsius (100F) above room temperature. DIY LIGHTSPEED ATTENUATOR Photograph 7: Finished Lightspeed Passive Attenuator. The cost for my DIY Lightspeed Attenuator was about $40-50US, $30 of which went towards the matched set of optocouplers. If you are interested in higher quality volume controls, this is a very good project toconsider.
300B SINGLE-ENDED (SE) TUBE AMPLIFIER SCHEMATIC (6SN7 INPUT) 300B Single-Ended Triode (SET) Amplifier Schematic. This amp is the quintessential triode amp. It just does its job, period. It is honest and accurate and sweet and will drive a surprising number of commercial speakers to acceptable levels. OATLEY K272 JAN 6418 VALVE (TUBE) PREAMPLIFIER / HEADPHONE Update Feb 2010: Oatley Electronics has introduced an updated version of this kit, the K272A.See the 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) thread for more info.. Update May 2010: Oatley Electronics has introduced a phono preamp kit, using the same 6418 valves.See my build of the Oatley Electronics K282 6418 Valve RIAA Phono Preamplifier Kit. JORDAN JX92S FULLRANGE LOUDSPEAKER DRIVER / TRANSDUCER Jordan JX92S Fullrange Speaker Driver (Transducer) Note - this driver has been discontinued and is no longer being produced. The Jordan JX92S is a 5" metal cone fullrange driver which is listed by the manufacturer as having an X max of 9 mm. TDA2050 - 32W HI-FI AUDIO POWER AMPLIFIER DATASHEET SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VS Supply Voltage ±25 V Vi Input Voltage VS Vi Differential Input Voltage ±15 V IO Output Peak Current (internally limited) 5 A Ptot Power Dissipation TCASE = 75°C25W Tstg, Tj Storage and Junction Temperature -40 to 150 °C THERMAL DATA Symbol Description Value Unit Rth j-case Thermal Resistance junction-case Max 3 °C/W PUSH-PULL (PP) EL84 TUBE AMPLIFIER SCHEMATIC (ECC83 INPUT) Push-Pull (PP) EL84 Tube Amplifier Schematic (ECC83 input) Push-Pull (PP) EL84 Tube Amplifier Schematic with ECC83 input stage. The tube rectified power supply uses an EZ81 tube. KT120 PUSH-PULL TUBE AMPLIFIER SCHEMATIC (ODDWATT AUDIO OBHO) This KT120 push-pull amplifier is a class-A, ultra-linear design with a self-inverting output stage, much like the other ones posted in previous projects. The amplifier will deliver approximately 45 watts RMS with a bandwidth of 10 Hz to 25 kHz +/- 0.5 dB (with the negative feedback engaged). Distortion is under 1% at half power and gradually LE PACIFIC JFET PHONO PREAMP FOR MM AND MC CARTRIDGES Figure 1: Le Pacific JFET Phono Preamplifier Schematic. This is a strip board construction using brown polypropylene caps from the local electronics store. The large electrolytic capacitor is 10,000uF fed by a 1 ohm resistor. Wire wrap wire is used as hook-up wire. Silver based solder, gold RCAs and all installed in an embossed gold chocolatesbox.
EMINENCE ALPHA-15A
The Eminence Alpha-15A is a 381 mm (15") diameter paper cone woofer. Eminence recommends the Alpha-15A driver for professional audio and bass guitar applications as a woofer in a vented or sealed enclosure. The woofer has a high Q ts and works very well with open baffle speaker designs. We have found the Alpha-15A to be a cost effectiveand
JEAN HIRAGA'S SUPER CLASS-A AMPLIFIER My version of the Jean Hiraga Super Class-A Amplifier is running at a bias of about 1.65A @ 35V resulting in about 58W of continuous dissipation per transistor in the output stage (just over 1/3 their rating of 150W). As you can imagine, the heat sink runs quite hot, approximately 40 Celsius (100F) above room temperature. DIY LIGHTSPEED ATTENUATOR Photograph 7: Finished Lightspeed Passive Attenuator. The cost for my DIY Lightspeed Attenuator was about $40-50US, $30 of which went towards the matched set of optocouplers. If you are interested in higher quality volume controls, this is a very good project toconsider.
300B SINGLE-ENDED (SE) TUBE AMPLIFIER SCHEMATIC (6SN7 INPUT) 300B Single-Ended Triode (SET) Amplifier Schematic. This amp is the quintessential triode amp. It just does its job, period. It is honest and accurate and sweet and will drive a surprising number of commercial speakers to acceptable levels. OATLEY K272 JAN 6418 VALVE (TUBE) PREAMPLIFIER / HEADPHONE Update Feb 2010: Oatley Electronics has introduced an updated version of this kit, the K272A.See the 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) thread for more info.. Update May 2010: Oatley Electronics has introduced a phono preamp kit, using the same 6418 valves.See my build of the Oatley Electronics K282 6418 Valve RIAA Phono Preamplifier Kit. JORDAN JX92S FULLRANGE LOUDSPEAKER DRIVER / TRANSDUCER Jordan JX92S Fullrange Speaker Driver (Transducer) Note - this driver has been discontinued and is no longer being produced. The Jordan JX92S is a 5" metal cone fullrange driver which is listed by the manufacturer as having an X max of 9 mm. TDA2050 - 32W HI-FI AUDIO POWER AMPLIFIER DATASHEET SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VS Supply Voltage ±25 V Vi Input Voltage VS Vi Differential Input Voltage ±15 V IO Output Peak Current (internally limited) 5 A Ptot Power Dissipation TCASE = 75°C25W Tstg, Tj Storage and Junction Temperature -40 to 150 °C THERMAL DATA Symbol Description Value Unit Rth j-case Thermal Resistance junction-case Max 3 °C/W OP-AMP BASED RIAA PHONO PREAMP FOR MM AND MC PHONO CARTRIDGES Design Considerations - Op-amp based Phono Preamp. The circuit is a non-inverting IC based filter with significant gain. Four of the components in the feedback loop determine the proper RIAA compensation. Slight variation in any of them is unlikely to be audible. The remaining components determine the gain and are forstability.
OATLEY K272 JAN 6418 VALVE (TUBE) PREAMPLIFIER / HEADPHONE Update Feb 2010: Oatley Electronics has introduced an updated version of this kit, the K272A.See the 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) thread for more info.. Update May 2010: Oatley Electronics has introduced a phono preamp kit, using the same 6418 valves.See my build of the Oatley Electronics K282 6418 Valve RIAA Phono Preamplifier Kit. 50EH5 SINGLE-ENDED (SE) DIY TUBE AMPLIFIER PROJECT The 50EH5 is a miniature power pentode which was primarily designed and widely used in the audio power output stage of radio and television receivers and in phonographs. The tube features high power sensitivity at low plate and screen voltages. Tube characteristics and the typical operation for a Class A1 Amplifier is summarized below. Tokeep
JBAA - HIGH FIDELITY TUBE JUNK BOX AUDIO AMPLIFIER Bruce Heran outlines the design and construction of a High Fidelity Tube Junk Box Audio Amplifier (JBAA). The JBAA tube amplifiers can use a 12AX7, 12AU7, ECC82, ECC83, 5751, 12SL7, 6SL7 in the driver position and 6V6, 6AQ5, 6005, 6Y6G, EL84, 6BQ5, 6F5P, 6P15P-EB, 6Y6GA, 6K6, 6W6, 6GV8, 6BM8, ECL82, ECL85 output tubes. The circuit is biased into Class-A, ultra-linear operation. DIY 6V6 PUSH-PULL TUBE AMPLIFIER DIY 6V6 Push-Pull Tube Amplifier 6V6 push-pull tube amp with Hammond 1608A audio output transformers. 6SL7 input and GZ34 rectifier. DIY ECC802S (12AU7 / ECC82) VACUUM TUBE SRPP PREAMPLIFIER The DIY version of the ForeWatt tube preamp. The preamplifier uses the 12AU7 family of tubes that also includes ECC802S and ECC82 valves. Thepreamp uses a
GOBO STEREO AUDIO AMPLIFIER KIT (LM1875, 15W, CLASS-AB The Gobo amplifier kit is a complete kit in that it includes all the necessary parts and enclosure required to build a complete stereo amplifier. The LM1875 amplifier kit is easy to build armed with just soldering skills and the detailed step-by-step instructions. The amplifier kit comes with audio-grade capacitors and toroidaltransformer.
LOW-INDUCTANCE DIY BRAIDED HI-FI SPEAKER CABLES Low-Inductance DIY Hi-Fi Speaker Cables. The 1.618wr speaker cables turned out well and I thought I would share the instructions and results. I am using these DIY low-inductance speaker cables with my DIY Hi-Vi 3-Way Speakers.The speaker cables use 16AWG strnaded copper wire, a total of 4 x 16AWG wires for each speaker cable conductor which give an equivalent AWG of 10 (see American NELSON PASS B1 BUFFER PREAMP Nelson Pass B1 Buffer Preamp - rear DIY Nelson Pass B1 Buffer from the rear shows two selectable inputs and a single output. HORN LOUDSPEAKER DESIGN Horn loudspeaker design Three articles summarizing the development of design theories and concluded with two systems for construction by J.Dinsdale, M.A..
DIY AND HI-FI AUDIO SCHEMATICSLACEWOODST35DYNACO A420 TRANSFORMER2A3 SINGLE-ENDED TRIODEST70 This is our collection of DIY and Hi-Fi Audio Schematics. Feel free to send us your hi-fi audio schematics and we will add them here. If you have built any of these circuits, we would love to hear from you so send us your comments. Many of these diy Audio Books contain schematics. You can also find more schematics through some of thesites
DIY VACUUM TUBE (VALVE) AMPLIFIER PROJECTS The 6DJ8 tube headphone amplifier is suitable for use with many Hi-Fi headphones. Output power is over 100 mW between 32 ohms to 300 ohms. The response is 20 Hz to 28 kHz within 0.5 dB and the wide band signal-to-noise is -84 dB. DIY EL84 Push-Pull (Class-A, Ultra-Linear) Amplifier - 30 September 2012. JBAA - HIGH FIDELITY TUBE JUNK BOX AUDIO AMPLIFIERJUNK BOX FOR SALEMYJUNK BOX
Bruce Heran outlines the design and construction of a High Fidelity Tube Junk Box Audio Amplifier (JBAA). The JBAA tube amplifiers can use a 12AX7, 12AU7, ECC82, ECC83, 5751, 12SL7, 6SL7 in the driver position and 6V6, 6AQ5, 6005, 6Y6G, EL84, 6BQ5, 6F5P, 6P15P-EB, 6Y6GA, 6K6, 6W6, 6GV8, 6BM8, ECL82, ECL85 output tubes. The circuit is biased into Class-A, ultra-linear operation.EMINENCE ALPHA-15A
The Eminence Alpha-15A is a 381 mm (15") diameter paper cone woofer. Eminence recommends the Alpha-15A driver for professional audio and bass guitar applications as a woofer in a vented or sealed enclosure. The woofer has a high Q ts and works very well with open baffle speaker designs. We have found the Alpha-15A to be a cost effectiveand
JEAN HIRAGA'S SUPER CLASS-A AMPLIFIER My version of the Jean Hiraga Super Class-A Amplifier is running at a bias of about 1.65A @ 35V resulting in about 58W of continuous dissipation per transistor in the output stage (just over 1/3 their rating of 150W). As you can imagine, the heat sink runs quite hot, approximately 40 Celsius (100F) above room temperature. OATLEY K272 JAN 6418 VALVE (TUBE) PREAMPLIFIER / HEADPHONEHEADPHONE AMPLIFIER KITAUDIO TUBE AMPLIFIER KIT Update Feb 2010: Oatley Electronics has introduced an updated version of this kit, the K272A.See the 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) thread for more info.. Update May 2010: Oatley Electronics has introduced a phono preamp kit, using the same 6418 valves.See my build of the Oatley Electronics K282 6418 Valve RIAA Phono Preamplifier Kit. DIY SILVER RCA INTERCONNECT CABLES DIY Silver RCA Interconnect Cable Construction. This single-ended RCA interconnect (IC) cable project is very easy to construct, extremely satisfying and relatively inexpensive to complete with astonishingresults.
300B SINGLE-ENDED (SE) TUBE AMPLIFIER SCHEMATIC (6SN7 INPUT)300B TUBE AMPLIFIER300B TUBE AMPLIFIER SCHEMATIC300B TUBE AMPLIFIER SCHEMATIC300B AMPLIFIER KIT300B TUBE AMP KIT300B TUBE AMP SCHEMATIC 300B Single-Ended Triode (SET) Amplifier Schematic. This amp is the quintessential triode amp. It just does its job, period. It is honest and accurate and sweet and will drive a surprising number of commercial speakers to acceptable levels. LE PACIFIC JFET PHONO PREAMP FOR MM AND MC CARTRIDGESJFET PHONO PREAMPBEST PHONO PREAMP KITJFET GUITAR PREAMPRIAA PHONO PREAMP KITFET PREAMP CIRCUITMOSFET PREAMP Figure 1: Le Pacific JFET Phono Preamplifier Schematic. This is a strip board construction using brown polypropylene caps from the local electronics store. The large electrolytic capacitor is 10,000uF fed by a 1 ohm resistor. Wire wrap wire is used as hook-up wire. Silver based solder, gold RCAs and all installed in an embossed gold chocolatesbox.
SMALL FOSTEX FULLRANGE SPEAKER MODIFICATIONS AND TWEAKS The modifications and tweaks are generally focused around the idea that the light-weight stamped steel chassis can "ring". These modifications and tweaks are suitable for the Fostex (FE83En, FE103En, FE126En, FF85WK, FF105WK, FF125WK) drivers and can likely be applied to similar small speaker drivers that also use a stamped steelchassis.
DIY AND HI-FI AUDIO SCHEMATICSLACEWOODST35DYNACO A420 TRANSFORMER2A3 SINGLE-ENDED TRIODEST70 This is our collection of DIY and Hi-Fi Audio Schematics. Feel free to send us your hi-fi audio schematics and we will add them here. If you have built any of these circuits, we would love to hear from you so send us your comments. Many of these diy Audio Books contain schematics. You can also find more schematics through some of thesites
DIY VACUUM TUBE (VALVE) AMPLIFIER PROJECTS The 6DJ8 tube headphone amplifier is suitable for use with many Hi-Fi headphones. Output power is over 100 mW between 32 ohms to 300 ohms. The response is 20 Hz to 28 kHz within 0.5 dB and the wide band signal-to-noise is -84 dB. DIY EL84 Push-Pull (Class-A, Ultra-Linear) Amplifier - 30 September 2012. JBAA - HIGH FIDELITY TUBE JUNK BOX AUDIO AMPLIFIERJUNK BOX FOR SALEMYJUNK BOX
Bruce Heran outlines the design and construction of a High Fidelity Tube Junk Box Audio Amplifier (JBAA). The JBAA tube amplifiers can use a 12AX7, 12AU7, ECC82, ECC83, 5751, 12SL7, 6SL7 in the driver position and 6V6, 6AQ5, 6005, 6Y6G, EL84, 6BQ5, 6F5P, 6P15P-EB, 6Y6GA, 6K6, 6W6, 6GV8, 6BM8, ECL82, ECL85 output tubes. The circuit is biased into Class-A, ultra-linear operation.EMINENCE ALPHA-15A
The Eminence Alpha-15A is a 381 mm (15") diameter paper cone woofer. Eminence recommends the Alpha-15A driver for professional audio and bass guitar applications as a woofer in a vented or sealed enclosure. The woofer has a high Q ts and works very well with open baffle speaker designs. We have found the Alpha-15A to be a cost effectiveand
JEAN HIRAGA'S SUPER CLASS-A AMPLIFIER My version of the Jean Hiraga Super Class-A Amplifier is running at a bias of about 1.65A @ 35V resulting in about 58W of continuous dissipation per transistor in the output stage (just over 1/3 their rating of 150W). As you can imagine, the heat sink runs quite hot, approximately 40 Celsius (100F) above room temperature. OATLEY K272 JAN 6418 VALVE (TUBE) PREAMPLIFIER / HEADPHONEHEADPHONE AMPLIFIER KITAUDIO TUBE AMPLIFIER KIT Update Feb 2010: Oatley Electronics has introduced an updated version of this kit, the K272A.See the 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) thread for more info.. Update May 2010: Oatley Electronics has introduced a phono preamp kit, using the same 6418 valves.See my build of the Oatley Electronics K282 6418 Valve RIAA Phono Preamplifier Kit. DIY SILVER RCA INTERCONNECT CABLES DIY Silver RCA Interconnect Cable Construction. This single-ended RCA interconnect (IC) cable project is very easy to construct, extremely satisfying and relatively inexpensive to complete with astonishingresults.
300B SINGLE-ENDED (SE) TUBE AMPLIFIER SCHEMATIC (6SN7 INPUT)300B TUBE AMPLIFIER300B TUBE AMPLIFIER SCHEMATIC300B TUBE AMPLIFIER SCHEMATIC300B AMPLIFIER KIT300B TUBE AMP KIT300B TUBE AMP SCHEMATIC 300B Single-Ended Triode (SET) Amplifier Schematic. This amp is the quintessential triode amp. It just does its job, period. It is honest and accurate and sweet and will drive a surprising number of commercial speakers to acceptable levels. LE PACIFIC JFET PHONO PREAMP FOR MM AND MC CARTRIDGESJFET PHONO PREAMPBEST PHONO PREAMP KITJFET GUITAR PREAMPRIAA PHONO PREAMP KITFET PREAMP CIRCUITMOSFET PREAMP Figure 1: Le Pacific JFET Phono Preamplifier Schematic. This is a strip board construction using brown polypropylene caps from the local electronics store. The large electrolytic capacitor is 10,000uF fed by a 1 ohm resistor. Wire wrap wire is used as hook-up wire. Silver based solder, gold RCAs and all installed in an embossed gold chocolatesbox.
SMALL FOSTEX FULLRANGE SPEAKER MODIFICATIONS AND TWEAKS The modifications and tweaks are generally focused around the idea that the light-weight stamped steel chassis can "ring". These modifications and tweaks are suitable for the Fostex (FE83En, FE103En, FE126En, FF85WK, FF105WK, FF125WK) drivers and can likely be applied to similar small speaker drivers that also use a stamped steelchassis.
HI-FI AUDIO DRIVERS
Hi-Fi Audio Drivers (Speakers and Tweeters) These are some of the drivers that we have had the opportunity to try out over the years. The pages contain information about the drivers (transducers) including photographs, history and background information, driver specifications and links to DIY speaker enclosure designs. OP-AMP BASED RIAA PHONO PREAMP FOR MM AND MC PHONO CARTRIDGES Design Considerations - Op-amp based Phono Preamp. The circuit is a non-inverting IC based filter with significant gain. Four of the components in the feedback loop determine the proper RIAA compensation. Slight variation in any of them is unlikely to be audible. The remaining components determine the gain and are forstability.
DIY VACUUM TUBE (VALVE) AMPLIFIER PROJECTS The 6DJ8 tube headphone amplifier is suitable for use with many Hi-Fi headphones. Output power is over 100 mW between 32 ohms to 300 ohms. The response is 20 Hz to 28 kHz within 0.5 dB and the wide band signal-to-noise is -84 dB. DIY EL84 Push-Pull (Class-A, Ultra-Linear) Amplifier - 30 September 2012. LE PACIFIC JFET PHONO PREAMP FOR MM AND MC CARTRIDGES Figure 1: Le Pacific JFET Phono Preamplifier Schematic. This is a strip board construction using brown polypropylene caps from the local electronics store. The large electrolytic capacitor is 10,000uF fed by a 1 ohm resistor. Wire wrap wire is used as hook-up wire. Silver based solder, gold RCAs and all installed in an embossed gold chocolatesbox.
GOBO STEREO AUDIO AMPLIFIER KIT (LM1875, 15W, CLASS-AB The Gobo amplifier kit is a complete kit in that it includes all the necessary parts and enclosure required to build a complete stereo amplifier. The LM1875 amplifier kit is easy to build armed with just soldering skills and the detailed step-by-step instructions. The amplifier kit comes with audio-grade capacitors and toroidaltransformer.
BOOZHOUND LABORATORIES JFET RIAA PHONO PREAMP KIT Figure 1: Boozhound Labs JFET Phono (RIAA) Preamp Kit Schematic. BHL has altered the schematic slightly by adding small source resistors, power supply (PS) decoupling resistors, additional smoothing capacitors and some refinements of the RIAA equalization network. But they took the whole concept of the kit a lot further than most byoffering
DIY SPEAKER / AMPLIFIER DUMMY LOAD DIY Speaker / Amplifier Dummy Load. This is a simple DIY Speaker dummy load that was put together very quickly. After constructing an AMP6 T-Amp kit, and while testing the maximum power output using 4.7 ohm 50W ceramic power resistors the hot resistors had begun to scortch a cutting mat they were resting on and also melting the wire insulation of test leads which had fallen on one of the KT120 PUSH-PULL TUBE AMPLIFIER SCHEMATIC (ODDWATT AUDIO OBHO) This KT120 push-pull amplifier is a class-A, ultra-linear design with a self-inverting output stage, much like the other ones posted in previous projects. The amplifier will deliver approximately 45 watts RMS with a bandwidth of 10 Hz to 25 kHz +/- 0.5 dB (with the negative feedback engaged). Distortion is under 1% at half power and graduallySTEVE'S TUBE PAGES
Battery Powered Tube Amplifiers. This section contains schematics and description of all battery powered tube amplifiers. The couple watter uses PP or PPP 6AK6 output stage and includes a switching supply to upconvert 12 volts to about 170V. JORDAN JX92S FULLRANGE LOUDSPEAKER DRIVER / TRANSDUCER Jordan JX92S Fullrange Speaker Driver (Transducer) Note - this driver has been discontinued and is no longer being produced. The Jordan JX92S is a 5" metal cone fullrange driver which is listed by the manufacturer as having an X max of 9 mm. * DIY Audio Projects* DIY Audio Forum
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NEW Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) BiasOptimization .
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* DIY SPEAKER Projects * Speaker Drivers / Tweeters * DIY SOLID STATE Projects * DIY IC / OP-AMP Projects * DIY PHONO Projects * DIY CABLE Projects * Misc. Audio Projects * Hi-Fi Audio SCHEMATICS * Technical Audio Information * Testing Equipment / Tools* DIY Audio LINKS
* Contact / About Us DIY AUDIO PROJECTS - DIY HI-FI FOR AUDIOPHILESDIY AUDIO PROJECTS
Do-It-Yourself (DIY) Audio Projects - projects for audiophiles, hi-fi enthusiasts, music lovers, electronic hobbyists, woodworkers and those who like to learn, build and listen to music. This site exists to promote the hobby of DIY Audio. There is nothing for sale here. All project documentation presented on this site is free for personal non-commercial use. If you have a DIY Audio Project that you would like to share with others through this site, or if you have any comments, contact us or post a message on the DIY Audio Projects Forum . Questions about a specific projects can be sent to the project author noted at the top of the project page. If you are new to DIY Audio but want to learn more, take a look at our DIY Audio Book recommendations. Last update: 10 November 2019 FOLLOW DIY AUDIO PROJECTSShare
-------------------------DIY AUDIO PROJECTS
These are some of our featured DIY audio projects. For more DIY projects, use the navigation menu on the left hand side of the page. High Fidelity Tube Junk Box Audio Amplifier - _10 November 2019_NEW
Bruce Heran outlines the design and construction of a High Fidelity Tube Junk Box Audio Amplifier (JBAA). The schematic is similar to the PoddWatt design and able to use a huge variety of tubes. The JBAA tube amplifier can use a 12AX7, 12AU7, ECC82, ECC83, 5751, 12SL7 or 6SL7 in the driver position while 6V6, 6AQ5, 6005, 6Y6G, EL84, 6BQ5, 6F5P, 6P15P-EB, 6Y6GA, 6K6, 6W6, 6GV8, 6BM8, ECL82 or ECL85 can be used for the output tubes. The circuit is biased into Class-A, ultra-linear operation and output power will be dependent on the tubes utilized. ------------------------- 6CY7 Single-Ended Triode (SET) Amplifier- _30 July 2016_
This inexpensive Single-Ended Triode (SET) amp is built around a pair of 6CY7 vertical deflection dual triodes built for TVs. At full output the amp produces a clean 1.3 Watts output per channel into 8Ω. The Edcor XSE output transformers are rated from 70Hz to 18kHz. This amplifier did a little better than this having a -3dB bandwidth from about 46Hz to about 30kHz. The 6CY7 stereo amp uses a 6CA4 tube rectified power supply with excellent channel separation. Matt reports: _This is quickly becoming my favorite amp. I currently have a set of NOS Sylvania tubes in it, but I have also used a set of old used GE tubes which sound just as good. I highly recommend that anyone looking for a little iPod or computer amp give this one a try._ ------------------------- DIY JFET MC Pre-Preamp Kit - _19 Sept 2015_ KIT LOW VOLTAGE This is the Boozhound Laboratories JFET Moving-Coil (MC) Pre-Preamp Kit. The MC pre-preamp kit consists of a PCB, standoffs, the circuit parts and building instructions. The builder will need to provide a 12-24VDC power supply, an enclosure and miscellaneous hardware like connectors and switches. The kit uses 2SK170 JFET transistors and comes with fabulous vintage Russian military paper-in-oil (PIO) capacitors. Mark uses 9V batteries for the power supply and is very pleased with the results. ------------------------- 6EM7 Single-Ended Triode (SET) Amplifier- _29 June 2015_
Matt describes the design and construction of a Single-Ended Triode (SET) amplifier built around a pair of 6EM7 double triode tubes. The clean output power from the 6EM7 SET amplifier is about 2.2 Watts per channel with a frequency response that matches the audio output transformers. The single-ended 6EM7 amplifier is housed in a vertical wooden chassis that has been styled after early vacuum tube equipment of the 1920s. The 6EM7 SET amplifier uses a 6CA4 tube rectified power supply with excellent channel separation and which is very quiet. Matt reports that _the 6EM7 amplifier sounds wonderful! The bass is well articulated without being boomy, mid-tones are clear and even, and the highs are crystal clear_. ------------------------- Fostex FE206En in Back-Loaded Horn Speaker Cabinets- _1 September
2014_
Once again Mark tries on the Fostex FE206En high sensitivity fullrange driver, but this time the end result is a large elaborate back-loaded horn loudspeaker. The speaker cabinet plans are from the FE206En driver datasheet. The horn loudspeaker cabinets are made from 21 mm thick pine plywood and use a single FE206En fullrange driver and no crossover. Australian beeswax is used on the outside of the horn cabinet and heavy cedar oil was applied to the mouth of the horn. The sensitivity of the FE206En driver is greater than 96 dB / 1W / 1m, so the rear-loaded horn speakers are very well suited for use with very low power tube amplifiers. Mark reports that the horn speakers can draw an extremely accurate soundstage, sound excellent and have lead to a whole new listening experience with Paris, a 2.5W 6EM7 SETamplifier.
------------------------- Gobo LM1875 Stereo Amplifier Kit -_21 July 2014_
The Gobo Stereo Amplifier kit is a class-AB chip amp kit based around the LM1875 IC. This is a complete amp kit that includes all the necessary parts and enclosure to build a stereo amplifier. The LM1875 amp kit comes with audio-grade capacitors and toroidal transformer. The Gobo amplifier kit is easy to build, looks and sounds great. The amplifier kit is well suited to first time amp builders. ------------------------- DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier- _24 March 2014_
This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. As a thank you for the 300B amplifier schematics, Stamou has shared his implementation of the 300B single-ended tube amplifier schematic by J.C. Morrison. The 300B SET amp uses a 6SN7 direct coupled driver stage and an all low mu triode array. The power supply filtering sections have been duplicated for each channel for this 300B triode amplifier and premium parts are used throughout. The audio output transformers are Lundahl LL1623. This is a great sounding 300B triode amplifier that I am sure DIYers will find very rewarding. ------------------------- 4S Universal Preamplifier for 12A*7 Tubes - _15 December 2013_ The 4S Universal preamp is a Super Simple Single Stage (4S) line level Hi-Fi preamplifier that works well with the entire range of 12A*7 tubes - 12AU7, 12AV7, 12AY7, 12AT7, 12AZ7, and 12AX7. You can change the tube type to vary the sound and gain considerably. The preamp uses a 6CA4 tube rectified power supply which is very quiet. The Universal preamp is fun as it allows tube rolling to compare various tubes in your stash. This is a great simple preamplifier unit to bring out the most in your power amps. ------------------------- Fostex FE103En Bass Reflex Bookshelf / Nearfield Monitor Speakers- _14 Apr 2013_
Gio has put together a small bookshelf / monitor speaker using a single inexpensive fullrange speaker driver. The enclosure is a 6.9 L bass reflex cabinet tuned to about 95 Hz that follows the speaker box plans included with the driver datasheet. The loudspeakers use a single Fostex FE103En fullrange driver with no crossover circuit. The speakers work well as nearfield monitors and combined with a subwoofer the speakers can be used for home theater duties. ------------------------- DIY 6DJ8 (ECC88) Tube Headphone Amplifier - _24 November 2012_ This low power tube headphone amplifier project comes from Bruce Heran. The simple tube headamp uses one 6DJ8 (ECC88) tube per channel. The amplifier circuit is push-pull and biased into class-A operation with a CCS. Gain is sufficient that no driver stage is required for the tube amp. The 6DJ8 tube headphone amplifier is suitable for use with many Hi-Fi headphones. Output power is over 100 mW between 32 ohms to 300 ohms. The response is 20 Hz to 28 kHz within 0.5 dB and the wide band signal-to-noise is -84 dB. ------------------------- Speaker Projects Gallery - Parts-Express.com-
Check out the Parts-Express.com Speaker Projects Gallery for a wide range of DIY Loudspeaker projects. The Speaker Projects Gallery features over 50 DIY speaker projects that have been built by other DIY audio enthusiasts. Each speaker project includes complete drawings to illustrate construction of the speaker enclosure, crossover schematics, a full parts list and photographs of the finished speakerproject.
Shown in the photo to the left is the TriTrix MTM TL DIY speaker project. For those who are not great with woodworking, the TriTrix is available as complete kit. ------------------------- DIY EL84 Push-Pull (Class-A, Ultra-Linear) Amplifier - _30 September 2012_ Bruce Heran of OddWatt Audio outlines the design and construction of monoblock Push-Pull EL84 (6BQ5) valve amplifiers. The Mini Block tube amps use a 5751 twin triode to drive the EL84 push-pull output stage which is biased into class-A operation, ultra-linear mode. Output power is 5.8 W @ 2% (0.25% @ 1 W) and the response is 10 Hz to 44 kHz within 0.2 dB. Bruce reports that the Mini Blocks are more powerful than the Poddwatts and seem to have more detail while retaining all the good characteristics of the Poddwatt amps. ------------------------- Fostex FE206En Double Bass-Reflex Speaker Project- _17
September 2012_
Mark has put together his second set of the Fostex FE206En double bass-reflex speakers. The speaker box plans are from the datasheet that was supplied with the drivers. The loudspeakers use a single Fostex FE206En fullrange driver and no crossover. The sensitivity of the drivers is about 96 dB / 1W / 1m, so the double bass-reflex speakers are well suited for use with flea and low power tube amps. The two chamber box design extracts good bottom end from these low displacement drivers. The speakers will be used in a home theater so for a non-reflective finish the speaker enclosures are painted with a undercoating paint for a stipple like finish and flat black paint. Mark reports that the speakers are an excellent mate for use with his2.5W 6EM7 SET amp.
------------------------- DIY Stepped Attenuator Volume Control- _21 June 2012_
In this DIY attenuator project Matt uses an inexpensive ladder type stepped attenuator to make a passive stereo volume control. The switched attenuator comes fully assembled and uses 1% precision metal film resistors on a make before break 2-pole (stereo) 24-position switch. Checking noise, Matt found that the stepped attenuator has a noise figure which is about 26dB lower than a PEC hot molded carbon potentiometer of the same value. This attenuator project is simple to build and should save you some money if you are in the market for a passive hi-fi volume control. ------------------------- DIY Hi-Fi Phono Turntable - _26 March2012_
Nandor a very talented DIYer from Hungary has built this fabulous looking Hi-Fi record player. The DIY turntable project uses the platter and the direct drive motor assembly and controls from a Dual 701 record player. The tonearm is built from scratch following a magnetically Stabilized design which means that there are no fixed pivot points or bearings. The turntable plinth is made using stacked layers of plywood. A DIY record weight rounds out this challenging DIY record player project. ------------------------- DIY Shielded RCA Interconnect Cables - _22 February 2012_ Tom has put together an instructional guide to construct simple line-level RCA interconnect cables. The cables use shielded instrument wire and is very simple to construct requiring only some basic soldering skills. The required parts are easy to source and a pair of these shielded RCA cables can be built for as little as $10. Use these simple DIY cables to upgrade your stock and inexpensive interconnects. ------------------------- ------------------------- DIY 12AU7 (ECC82) / IRF510 Headphone Amplifier - _12 April 2010_LOW VOLTAGE
Rogers has built an improved version of his popular and simple low voltage 12AU7 / IRF612 Headphone Amplifier (5 Aug 2008). The new version allows novice builders to experience assembling and listening to their own headamp. The headphone amplifier is similar to the previous version in that a single 12AU7 (ECC82) vacuum tube is used for voltage gain and an IRF510 MOSFET follower stage is used to provide current to drive demanding headphones. The hybrid tube and MOSFET amplifier operates off a 12V SLA battery so there are no high voltage concerns. The main difference from the original version is that a LM317 regulator is used as a CCS to bias the MOSFET into class-A operation instead of a load resistor. The project includes PCB image files and can also be built on a protoboard. This simple headphone amp can be built for about $40-50. ------------------------- Tang Band D4-1 DIY Back Horn Speaker Kit- _10 March 2010_
KIT
The D4-1 DIY Back Horn Speaker Kit put together by Tang Band is very simple to build, sleek looking and sounds great. The DIY speaker kit comes complete with all the parts and tools required (except for a soldering iron) to build a great looking, little rear loaded single driver horn speaker system. There is no cutting or finishing (painting / staining) required to complete the speaker kit. The small horn speaker kit goes together much like ready-to-assemble furniture. The end result is an attractive and compact horn speaker that sounds great and is fun to build. ------------------------- DIY 6L6 / 5881 Single-Ended (SE) Tube Amplifier - _9 February 2010_ This fantastic looking tube amplifier was put together by Mr. Chey in Thailand. The DIY enclosure is constructed from aluminum sections and the audio output transformer covers are built using copper clad board. The circuit is very simple, a single-ended output stage using 6L6 or 5881 tubes, driven by 6SJ7 or 6SD7 cutoff pentodes. Mr. Chey is very pleased with the results and has replaced his solid state amp with this beauty. Nice work! ------------------------- DIY KT88 Push-Pull Monoblock Tube Amp Kit - _30 November 2009_ KIT A build and review of the Odd Block KT88 Series 1 Tube Amp Kits. The monoblock tube amp kit uses an SRPP input stage with 5751 driver tubes and a push-pull output stage with KT88 power tubes. A constant current source (LM317HVT voltage regulator) is used to force the output stage into class-A operation. A solid state power supply is used. The tube amp kit comes with a nice steel enclosure and the power output is about 25 watts. The amplifier circuit is very simple with minimal parts in the signal path. The result is a very nice sounding tube amplifier kit that performs well. ------------------------- DIY Low-Inductance Speaker Cables - _19 May 2009_ RECOMMENDED Adam has put together another fine looking set of Do-It-Yourself (DIY) Speaker Cables for his DIY 3-Way Hi-Vi Tower Loudspeakers. The cables are very simple to construct and are comprised of 16 gauge wires that are twisted together in alternating directions. The cable geometry results in a very low-inductance speaker cable with an equivalent wire gauge 10 so insertion losses are also low. High quality gold plated banana plugs, TechFlex and a laser etched decorative Oak Sleeve round off a very nice looking cable that rivals the performance of high quality commercial cable offerings. ------------------------- KT88 Push-Pull Mono Block Tube Amplifier Project - _29 October 2008_ UPDATED _(9 Oct 2012)_ Bruce's second follow up to his original "OddWatt" project are the "Odd Blocks", a pair of KT88 Push-Pull Mono Block Tube Amplifiers. Like the Oddwatt 225, the mono blocks are scalable and can be used with a number of octal tubes (KT77, 6CA7, EL34, 6L6GC, KT88, 6550, KT90). Like the previous projects the driver stage is an SRPP but this time with the 12SL7 tube. The output stage is a Class-A UL SIPP using KT88 tubes. LM317HV Regulators are used for the cathode CCS. Last updated 10 November 2019. © diyAudioProjects.com - Terms of Service - Privacy PolicyDetails
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