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DIY Chip Amp, Gainclone, Op-amp and T-Amp Projects

DIY Chip Amp, Gainclone, Op-amp and T-Amp Projects

Do-It-Yourself (DIY) Audio Projects that use integrated circuits (IC), semiconductor chips or operational amplifiers (op-amps). Projects that use switching topologies (class-D or class-T) are also included in this collection. With proper implementation, the TDA2050, LM1875, LM3875 and LM3886 IC chips can be used to build high quality class-AB amplifiers at a relatively low cost. Questions and discussions involving chip amplifiers and op-amps are welcome in the Op-Amps / Chip Amps / Gainclone / Class-D forum.

Last update: 21 July 2014

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DIY Chip Amp, Gainclone, Op-amp and T-Amp Projects

The DIY projects are listed chronologically. For other types of projects, use the navigation to the left.

Gobo LM1875 Stereo Amplifier Kit Gobo LM1875 Stereo Amplifier Kit - 21 July 2014  Canadian Flag   NEW 
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.

Op-amp based RIAA Preamplifier for MM and MC Phono Cartridges Op-amp based RIAA Preamp for MM / MC Phono Cartridges - 1 Sept 2013  USA Flag    Low Voltage 

This project by Bruce is for a relatively simple but high performance RIAA phono preamplifier that can handle both moving magnet (MM) and low output moving coil (LOMC) cartridges. The preamplifier circuit uses a Burr-Brown OPA2134 operation amplifier (op-amp) for the active RIAA filter. The power supply makes clever use of a Meanwell DCW03A-12 DC to DC converter to produce a regulated symmetrical power supply. The RIAA preamplifier can be built for about $100US including a modest enclosure. Bruce reports that this is a "surprisingly nice sounding preamplifier".

DIY TDA2050 Hi-Fi Chip Amplifier DIY TDA2050 Hi-Fi Chip Amplifier (chipamp) - 5 July 2009  German Flag   UPDATED  (16 April 2012)
A small hi-fi chip amplifier (chipamp) project put together by Thomas in Germany which he calls his "Mini Gainclone". The amp uses a STMicroelectronics TDA2050V chip capable of producing about 25W into 8 ohms. The circuit is very simple and constructed on a protoboard. The power supply uses a 120VA torroidal transformer and generally follows the "snubberized" Gainclone power supply design. A black steel Hammond enclosure rounds out the amp. Thomas reports that the small chipamp can hold it own against various high quality amplifiers he has used.

DIY MM Phono Preamp Kit DIY Phono Preamplifier Kit (moving magnet) - 1 December 2008  Australian Flag
Mark has put together a phono preamplifier for moving magnet cartridges from an electronics kit. The kit comes complete with everything you need except for an enclosure and a power supply (AC walwart). The design uses LM833 op-amps and the power supply section is regulated. The design supports multiple compensations, including RIAA and DECCA. Mark reports that the kit is dead quiet, performs well and holds it's own against a popular commercial phono preamp.

AMP6 DIY T-Amp Project AMP6: DIY Class-T Amplifier Kit - 3 December 2007  Canadian Flag
This is my first Class-T amplifier, an AMP6 kit from It is a simple, compact and inexpensive kit that provides great performance. It uses the Tripath TA2020 chip and includes an onboard regulated power supply.

CMoy Grado RA1 Headphone Amp CMoy / Grado RA1 Headphone Amplifier - 28 November 2007  Australian Flag    Low Voltage 

Mark's latest project is a simple battery powered headphone amplifier. His DIY headphone amplifier project follows the idea of the popular CMoy headphone amplifier. Power is supplied from two 9-volt batteries. The idea to house the Headphone Amplifier in a wooden enclosure comes from the Grado RA1 headphone amplifier.

Synergy LM3875 Chip Amp (Gainclone) Synergy LM3875 Gainclone Chip Amplifier - 5 October 2007  Australian Flag
Mark has been cooking and put together another Gainclone amplifier. This chip amplifier uses the LM3875 chip and point-to-point wiring. This amplifier follows the idea of the 47 Laboratory Gaincard amplifier, "rigid and compact". The amplifier is housed in an enclosure constructed from an aluminum cooking pan and wooden cutting board.

LM3875 Chip Amplifier The "Beast" - LM3875 Chip Amplifier - 25 April 2007  USA Flag

Bruce has completed a LM3875 Non-Inverting Chip Amplifier using a LM3875 kit from He has affectionately named his gainclone project the "Beast". For the enclosure, Bruce used plastic and aluminum project boxes from Radio Shack. Consistent with what most other chip amp builders are finding out, these gainclone kits result in a great sounding Hi-Fi amplifier at a very modest price.

Nanoo LM3875 Chip Amplifier (gainclone) Nanoo LM3875 Gainclone Chip Amplifier - 18 December 2006  Australian Flag

Another Gainclone amplifier! This is Mark's tiny Nanoo Amplifier. The enclosure is an aluminum box that measures only 119 X 94 X 34 mm. The amplifier uses the popular LM3875 IC chip with point-to-point wiring construction. Power to the amplifier is provided via an external power supply.

LM3886 Chip Amp (gainclone) LM3886 Chip Amplifier (Gainclone) - 9 May 2006  Canadian Flag

Having now completed a couple of tube amplifier projects, curiosity got the better of me and it came time to hear for myself what all the IC chip amplifier (gainclone) rave has been about. Using printed circuit boards from, parts on-hand and a Hammond Chassis, I managed to put together a very simple 50W+ amplifier based around the LM3886 IC chip. The project results were very surprising as this gainclone amplifier sounds far better than it should considering the circuit simplicity and the low build cost. There is plenty of available power and the LM3886 amplifier is suitable to drive a wide range of speaker loads.