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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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Class-D-SureElectronics-Amp.jpg
Class-D-SureElectronics-Amp.jpgClass-D Sure-Electronics Amplifier973 viewsThis is my first DIY Class-D amplifier. The amp is based on a $30 Sure-electronics module. The amplifier modules requires only a 30VDC high current power supply because into 4 ohm it can produce 100Wpc. The enclosure is an off the shelf 2U 19” rack mount type. The power supply has an 18-0-18V, 9A toroidal transformer. A 10A rec bridge, some snubbing caps and 30,000 uF of stage caps make up the power supply. Two selectable inputs provide direct connection to the amp module or connection via an Alp pot and 4 Oz brass knob. Very crisp sounding with good detail... See the forum thread Class D 100W power amp for more information.

Mark Houston – retro-thermionic
Class-D-SureElectronics-Amp-Inside.jpg
Class-D-SureElectronics-Amp-Inside.jpgClass-D Sure-Electronics Amplifier (Inside)989 viewsThis is my first DIY Class-D amplifier. The amp is based on a $30 Sure-electronics module. The amplifier modules requires only a 30VDC high current power supply because into 4 ohm it can produce 100Wpc. The enclosure is an off the shelf 2U 19” rack mount type. The power supply has an 18-0-18V, 9A toroidal transformer. A 10A rec bridge, some snubbing caps and 30,000 uF of stage caps make up the power supply. Two selectable inputs provide direct connection to the amp module or connection via an Alp pot and 4 Oz brass knob. Very crisp sounding with good detail... See the forum thread Class D 100W power amp for more information.

Mark Houston – retro-thermionic
Gobo-LM1875-Stereo-Amplifier-Kit.jpg
Gobo-LM1875-Stereo-Amplifier-Kit.jpgGobo LM1875 Stereo Amplifier Kit1280 viewsThe 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.

For full details, see our review of the Gobo LM1875 Stereo Amplifier Kit
TDA7294-chipamp-6N3-tube-input.jpg
TDA7294-chipamp-6N3-tube-input.jpgTDA7294 Chip Amplifer with 6N3 Tube input1721 viewsFrom a $48 printed circuit board and a bag of parts (eBay) I fashioned this very functional looking 80W amplifier. The parts include a 6N3 valve (preamp stage), two TDA7294 high performance power chips and all the parts required to populate the circuit board. You have to source the chassis, heatsinks and connectors yourself and that's where the expense starts.

The amplifier has been constructed in attractive charcoal black 2U 19" rack enclosure. Three sets of switchable RCAs on the back and 4 oz volume knob and Alps pot to control loudness. Speaker protection is included on the PCB and there is a delay (anti-thump) complete with flashing LED before the amp is ready for use. Very clean sound, holographic presentation.

For more details and impressions see the Chips and Tube - 6N3 and TDA7294 integrated amp thread.

Mark Houston – retro-thermionic
OPA2134-opamp-Headphone-Amplifier.jpg
OPA2134-opamp-Headphone-Amplifier.jpgOPA2134 CMoy Style Portable Headphone Amplifier2173 viewsThis simple headphone amplifier is based on the high performance OPA2134 opamp chip. This headphone amp\driver is good sounding and portable. The schematic is based on the very popular CMoy headphone amp design with some changes in passive parts values. For the power supply I elected to power the amp from two 9V batteries (18V) which provides longer playback time and greater dynamics.

There is only 100 mm of hookup wire in the signal path and all connections are component-2-component on the protoboard. Low ESR 200uF caps and a resistive network provide the differential voltages required to operate the chip without an output capacitor. The brd. is silver soldered with Mil. spec machined chip socket and Russian PIO caps on the input. Power only comes on when both phone jacks have plugs in them and the power switch (at the back) is on. The enclosure is impact resistant and lined with heavy aluminum foil for shielding and enclosure resonance control. The sound is clean and bright with good volume and dynamics. The amp is dead quiet with no signal.
SynergyII-Cu-LM3875-Gainclone.jpg
SynergyII-Cu-LM3875-Gainclone.jpgSynergyII\Cu - LM3875 Gainclone1967 viewsSynergyII\Cu started with 3.6kg of 100% very thick copper plate. The enclosure was selected, a 1U, 19" rack mount. The challenge was to build a pure Gainclone with its three resistors and simple 1500uF storage capacitors in a compact 1U enclosure. Everything had to fit in this tiny space including two 48VAC toroidal transformers for the dual mono supply, The LM3875 amplifier weighs 9.6 kg. The sound is clear, clean and solid with bass extended and very controlled.

See the original Synergy LM3875 Gainclone Amplifier (Chip Amp) project page.

Mark Houston – retro-thermionic
TDA2003-DIY-HiFi-Amplifier.jpg
TDA2003-DIY-HiFi-Amplifier.jpgTDA2030 DIY HiFi Amplifier5484 viewsAnother excellent looking build by vortchun. This DIY amplifier is built around the TDA2030 which will put out a maximum of 14W. The wooden enclosure matches the previously completed Voight Pipe Speakers Visaton BG 17 driver project.

For full details of this TDA2030 chip amplifier build, see the TDA2030 DIY Amplifier thread on the discussion forum.
TDA2003-Chip-Amplifier-Visaton-FRS-8-M-Sphere-Speakers.jpg
TDA2003-Chip-Amplifier-Visaton-FRS-8-M-Sphere-Speakers.jpgTDA2003 Chip Amplifier with Visaton FRS 8 M Sphere Speakers4900 viewsDIY TDA2003 Chip Amplifier build in a wooden enclosure matched with a pair of Visaton FRS 8 M Speakers in a Sphere enclosure. This set of amp and speakers is used for a PC audio setup.

For more information, see the tda2003 chip amplifier and Visaton FRS 8 M sphere speakers thread on the forum.
ZCA_1~1.jpg
ZCA_1~1.jpgRadoslav's ZCA (SE class-A mosfet amp)3175 viewsRadoslav's ZCA. It has a massive PS with nearly 68,000uf of filtering and a twin secondary tranni.

Schematic and details are availabe from the project page: DIY Class-A 2SK1058 MOSFET Amplifier.
ZCA_2.jpg
ZCA_2.jpgRadoslav's ZCA (SE class-A mosfet amp) 3755 viewsRadoslav has made a very professional looking build of the ZCA.

See the project page, DIY Class-A 2SK1058 MOSFET Amplifier for the schematic.
K281FrontS.jpg
K281FrontS.jpgOatley Electronics sub-mini tube/chip amp hybrid K2812812 viewsAn image of the front panel of the Oatley Electronics of Australia tube and chip hybrid power amp. You can see the UV leds which indicate when the amp modules are powered. The amp comprises two K281 kits and is dual mono construction.

After extensive listening I am convinced this is a very good combination of tubes and chip in one integrated power amp. Sound stage in deep with each performer or instrument have their own space on that stage. Holographic.
OatleyK281.jpg
OatleyK281.jpgOatley Electronics sub-mini tube/chip amp hybrid K2813854 viewsThere has been a number of hybrids over the years but none more unusual than Oatley Electronics, of Sydney Australia’s, Jan6418/LM1875 kit amp. Not crazy enough for you? How about we throw in a 24VDC International regulated switch mode power supply and build the finished amp as a dual mono construction? Crazy? You expected less from Australian Justic Branko owner of Oatley? Still not crazy enough? How about the amp only puts out 5W. Yes the chip is capable of 20W easy! Think what you can do with this kit.
This is my dead stock, out of the box build. And it sounds bloody great! Good sonic depth with chip amp holographic sound stage and tight, exceptionally controlled bass. And all for AU$29 plus shipping. Nuts!!! Not crazy enough. I added twin UV LEDs on the front panel to indicate when both modules are powered. That’s Crazy.
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IMGP2958~0.JPGLME49810 with ThermalTrak NJL3281D/1302D output devices4720 viewsThis is a chip amplifier (chipamp) based on the National Semiconductor LME49810 high-performance, high fidelity audio power amplifier driver chip. The output stage is a conventional emitter following using ThermalTrak to achieve good thermal tracking.
DIY-TDA205-Chip-Amplifier-Enclosure.jpg
DIY-TDA205-Chip-Amplifier-Enclosure.jpgDIY TDA2050 Chip Amplifier (chipamp)4180 viewsThe finished "Mini Gainclone" amplifier that is built using the TDA2050 IC. See the DIY TDA2050 Hi-Fi Chip Amplifier project page for full details. The enclosure is made from a Hammond satin black steel 12" x 8" x 3" chassis (Model 1441-24).
DIY-TDA2050-Mini-Gainclone-Chipamp.jpg
DIY-TDA2050-Mini-Gainclone-Chipamp.jpgTDA2050 Hi-Fi Chip Amplifier (chipamp)4812 viewsInside view of my "Mini Gainclone" - a TDA2050 Hi-Fi Chip Amplifier (chipamp). Output is about 25W and the amplifier is built on a protoboard. The power supply contains a 120VA torroidal transformer, 10,000uF capacitors and generally follows the "snubberized" gainclone power supply design. For full details, see the DIY TDA2050 Hi-Fi Chip Amplifier project page
PradaInsideBack.jpg
PradaInsideBack.jpgPrada OPA627 Preamplifier - inside4441 viewsI was inspired to build this preamp by learning of the Burr-Brown OPA627 (very high performance OP amp) and access to my daughter's Prada phone, heavy cardboard, container. The preamplifier modules are constructed on vero proto boards. Only component wire was used here. The input caps are Cornell Dubilier (white) and Solen (black) was used for the output). Metal film resistors, all pure silver hookup wire, gold RCAs jack and WBT silver solder make this a quality build. The box is lined with bitumanised aluminum foil and an Alps Blue Velvet attenuator and 4oz solid brass black knob add to this build. Four 9V lithium batteries (1200Ah each) drive the unit.
Prada_1.jpg
Prada_1.jpgPrada OPA627 Preamplifier3220 viewsUsing my daughter's Prada phone box (heavy cardboard) I fashioned this preamplifier around the Bur Brown (high performance) OPA627AP opamp ($AU50). It is a single stage preamp and powered by four lithium 9V batteries for a PS of 18V.

The black knob is solid brass and the attenuator is an Alps Blue Velvet. Gold RCA jacks, silver wire and WBT silver solder are used throughout.
CMoy-Headphone-Amplifier.jpg
CMoy-Headphone-Amplifier.jpgCMoy Headphone Amplifier4194 viewsCMoy Headphone Amplifier with 470uF capacitors and one 9B battery for the power supply. The opamp chip is a Burr Brown OPA2134PA. The enclosure is a Hammond 1455.

See the new CMoy Headphone Amp build thread for more information.
KJ1-Class-D-Amp-KJ2-Passive-Linestage.JPG
KJ1-Class-D-Amp-KJ2-Passive-Linestage.JPGAMP6 Amplifier + Passive Linestage3907 viewsTripath T-Amp using a 41Hz Amp6 T-Amp module and a toroidal power transformer. The linestage uses a top quality rotary switch and Gold Point attenuator. More info and FPD files are available on my project page.
Cheers, Keith
5-channel-LM3875-chipamp.jpg
5-channel-LM3875-chipamp.jpg5 Channel LM3875 ChipAmp / Gainclone Amplifier3975 viewsI was looking for a simple way to integrate 5.1 surround sound into a projector / PC based home theater a while back and then the idea hit me, I had just finished a 2 channel gainclone for my PC desktop with phenomenal sound. So here is my incarnation of a 5 channel gainclone. The case is custom, cherry front and back sections and plate Aluminum for sides, bottom and top. The heatsink was a leftover from an Advanced Energy RF amp. It is driven from an SB Live sound card. See the other photos.

See the gainclone amplifier pages for more chipamp ideas.
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