Solid State Audio Projects
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SV100852.JPG175W DIY Solid State Amp Kit4418 viewsThough this amp is designed as a hi-fi power amp with very low distortion figures, I use it as a guitar amp due to it’s high power. The PS is rated at 500VA. It plays extremely loud and can deliver nearly 200W into 4 ohms.
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Mike-DIY-Class-A-Mosfet-Amp3.jpgDIY Class A Mosfet Amplifier - Front3668 viewsFront view of amplifier which was built follow Mark's DIY Class A Mosfet Amplifier Design. For more information, see my project page.
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Mike-DIY-Class-A-Mosfet-Amp2.jpgDIY Class A Mosfet Amplifier - Inside6172 viewsInside view of amplifier which follow Mark's DIY Class A Mosfet Amplifier Design. You can see the heavy duty power supply. For more information, see the build log.
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Mike-DIY-Class-A-Mosfet-Amp1.jpgDIY Class A Mosfet Amplifier - Back4094 viewsRear view of the amplifier build. The amp follows Mark's DIY Class A Mosfet Amplifier Project. More information and pictures are available here.
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Mark-DIY-Class-A-Mosfet-Amplifier.jpgZero Component Amplifier - Single MOSFet SE Class A5808 viewsThis is another shot of the ZCA. It shows how the PS and heat sink all fit into one good looking case. Most of the heat is generated by the load resistors which are forward of the amp and line-up with the breather holes of the case. For more information, see DIY Class A Mosfet Amplifier Project page.
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John-DIY-Class-A-Mosfet-Amplifier-inside.jpgDIY SE Class A Mosfet Amplifier - inside view7201 viewsInside view of John's DIY amplifier which follows Mark's Single Ended DIY Class A Mosfet Amplifier topology. For more information, see the project thread at diyAudio.com.
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John-DIY-Class-A-Mosfet-Amplifier.jpgSingle Ended Class A Mosfet Amplifier4987 viewsJohn's build of Mark's Single Ended DIY Class A Mosfet Amplifier.
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summer_2006_068.jpgDual Mono DIY Phono Preamplifier5732 viewsDual Mono DIY Phono Preamplifier
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DSCF1556.JPGDual Mono Phono DIY Preamplifier3625 viewsDual Mono DIY Phono Preamplifier
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DIY-Class-A-Single-Ended-Amplifier-2SK1058-Mosfet.jpgDIY Class-A Single Ended (SE) Amplifier with 2SK1058 Mosfet4450 viewsImplementation of Mark's DIY Class A 2SK1058 MOSFET Amplifier Project. It was difficult to obtain good 10W non-inductive wire wound resistors, so a 12V 20W lamp was used in place of the load resistors. Like in ZenLite Amplifier. :)
Here is a link to more pictures of the amplifier.
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DIY-2SK1058-Mosfet-Amp-Night.JPGDIY 2SK1058 Class A Mosfet Amp in the dark2779 viewsSergiy Makharchuk from Russia has put together a version of Mark's DIY Class A 2SK1058 Mosfet Amplifier. Here you can see it lit up in the dark.
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DIY-2SK1058-Mosfet-Amp-Inside.JPG2SK1058 Mosfet Amplifier - Inside3896 viewsSergiy Makharchuk build of Mark's simple DIY Class A 2SK1058 Mosfet Amp Project. Here Sergiy has used light bulbs in place of the load resistor. The enclosure is recycled from an old piece of physiotherapy equipment.
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DIY-2SK1058-Class-A-Amp.JPG2SK1058 Class-A Amplifier - Inside View3335 viewsInside view of Sergiy's diy amplifier. This is the second version of the 2SK1058 DIY Class-A Single-Ended Mosfet Amplifier that has been built at the Russian audio community datagor.ru using light bulbs in place of load resistors.
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DIY-2SK1058-Class-A-Amp-Day.JPGSingle Ended Class-A Amplifier using 2SK1058 Mosfet2696 viewsOutside view of Sergiy's amplifier build. For more information, see the DIY Class-A Single-Ended 2SK1058 Mosfet Amplifier Project page.
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DIY-Class-A-Mosfet-Amplifier.jpgDIY Class A Mosfet Amplifier2662 viewsAnother variation of Mark's 2SK1058 Mosfet Amplifier. Here is a photograph of the inside of this DIY 2SK1058 Mosfet Amplifier project.
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DIY-Class-A-Mosfet-Amp.jpgDIY-Class-A-Mosfet-Amp2601 viewsThe fellows over at the Russian audio community datagor.ru have now built a small handful of Mark's simple DIY Class A Mosfet Amplifier project. See the schematic for more details about this build..
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2SK1058-2SK1057-2SK1056-IRFP240-classA-Mosfet-Amplifier.png2SK1058 / 2SK1057 / 2SK1056 / IRFP240 Class A Mosfet Amplifier Schematic3384 viewsSchematic of Ivan's modified version of Mark's simple DIY 2SK1058 Mosfet Amplifier. This version uses a 12V / 20W light for the load resistor.
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ClubPreampComp.jpgMelbourne Audio Club preamp comparison night equipment2538 viewsFor the preamp comparison my 12AX7 Tube Preamp and OP Amp Preamp were used. My Gainclone monoblocks were used for the power amps. The speakers in the other image were built by a club member also. An A/B switch was used to switch from one preamp to the other under a blind test situation. This allowed a quick comparison between the two very different preamps. Though the chip preamp was voted the better (60/40) many still expressed their preference for the valve preamp.
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The_SetUp.JPGLow noise mic preamp2170 viewsAfter preforming an on street recording of a classical busker with my Cowon mp3 in Florence I decided I wanted to do more recording. The Sony ECM-MS957 stereo mic (not made any more) had too low output to drive my mp3 player line-in or laptop digitizer so I made this low noise, two stage transistor (BC549) preamp (red lid). Because I used large 10uf polypropylene capacitors to ensure high quality sound recordings the preamp, though portable with internal batteries (12V), is quite large. Now I can use my mp3 player (128kps) to make quality recordings anywhere. There is no hiss or processing noise at all. The preamp is dead quiet. The preamp from the ESP site and is extremely easy to build. I use silver wire and silver solder throughout and gold connectors where possible. You can use 10uF electrolytic capacitors where I used polies but for the very best sound use the polyester capacitors. The designer suggests this in his text.
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MicPreCct.JPGInside the diy microphone preamp2354 viewsThe cct. brd. for the ESP low noise two transistor mic preamp attaches to the lid of the this solid die-cast aluminum case. Batteries also are mounted on the cct. brd. This preamp is free from hiss and all noise and is the perfect partner for high quality low output mics. A more compact version could be constructed using electrolytic caps and AAA batteries (12V). But the quality would suffer a little with the inferior caps.
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