DIY Solid State Hi-Fi Audio Projects
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A mixed collection Solid State Do-It-Yourself (DIY) audio projects. Power amplifiers, headphone amplifier and an attuator project. Most of the projects are very simple, but since they are operating in Class-A mode, they will often require a very robust power supply for good results. If you have a DIY project that you would like to share with other audio hobbyists through this site, please contact us.
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DIY 12AU7 (ECC82) / IRF510 Headphone Amplifier - 12 April 2010  NEW! 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. |
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DIY Lightspeed Passive Attenuator - 11 May 2009 Low Voltage
Uriah describes the operation of the Lightspeed Passive Attenuator and provides DIY instructions to build your own. The Lightspeed Passive Attenuator uses optocouplers for the level control and there are no "contact points" through this attenuator. I've built one for myself (photos inside) and I think it's great! This one is very simple to build, so take a look if you are interested in higher quality volume controls. |
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Jean Hiraga's Super Class-A Amplifier - 8 February 2009 
Dan has put together another a great looking Class-A amplifier following Jean Hiraga's "Super Class-A 30W" design published in the old French magazine "L'Audiophile". Dan used the original driver transistors, but due to the unavailability of the original power transistors, Toshiba 2SA1943 and 2SC5200 transistors are used. The transistor change allows for an increase in the rail voltage which results in more power (58W measured). Dan reports that Jean Hiraga's deceptively simple and pure Class-A circuit topology delivers great sonic results. |
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DIY 12AU7 (ECC82) Tube / IRF612 MOSFET Headphone Amplifier - 5 August 2008 Low Voltage
A compact Tube / Solid State hybrid headphone amp. This amplifier consists of a 12AU7 vacuum tube voltage gain stage and a Class-A MOSFET follower stage. The output device is an IRF612 MOSFET with a passive constant current source (CCS). Rogers reports good results from this simple design. |
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DIY Class-A IRF610 MOSFET Headphone Amplifier Project - 30 June 2008  Low Voltage
Here is a simple headphone amplifier that uses an external CD-ROM for the enclosure. The circuit topology is a single-ended Class-A amplifier stage with an active load. The output device is an IRF610 MOSFET and a LM317 regulator is used as a constant current source (CCS). The sonic results are surpirsingly good for such a simple design. |
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Jean Hiraga's - Le Monstre 8W Class-A Amplifier - 12 January 2008
Dan has put together a great looking amplifier which is based on Jean Hiraga's popular article "Le Monstre" (The Monster). Dan has used the original board layout, transistors and JFETs noted in the article. However, he did make some chages to the power supply. Instead of a battery, Dan's power supply is regulated. |
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DIY Class-A 2SK2221 MOSFET Amplifier - 4 July 2007 
This is Jochem's first DIY Audio Project, a build of Mark's ZCA shown below. Jochem's build of this very simple Class-A Mosfet amplifier uses the 2SK2221 MOSFET and a modified heavy duty power supply. Jochem was very pleased with the results of this project and is looking forward to completing more DIY Audio Projects in the future. |
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DIY Class-A 2SK1058 MOSFET Amplifier - 18 November 2006
Mark has put together a very simple MOSFET amplifier that he fashioned after a single-ended (SE) tube amplifier. The amplifier uses a single MOSFET and the results are a very simple Class-A SE amplifier with a low parts count. |