Hi, Well after having seen all the amazing projects and designs you guys have come up with I thought I would share my design on these pages. First and foremost this was designed for music reproduction in a domestic setting and without wanting to "hijack" another current thread, YES amplifiers do sound different, that is why I spent so much time in the development of this one. This amp is without doubt "musical" in all the best sense of that term, it's ability to recreate a believable soundstage is absolutely compelling. If anyone is interested in what it looks like and further details there are some piccys in the "Post your solid state pics here" forum. (About post 283) The thinking behind this project draws on the work of the late John Linsley Hood whose designs and thinking I much admired.
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This index of the thread should help you find the relevant important notes and general information.
1. The circuit diagram in this, post #1 is correct. The only omission is a 10 ohm 2 watt carbon/metal film across the output coil.
2. The TL071 opamp must not be substituted. This type works correctly on the single negative 12 volt rail. Other device types may not do so.
3. A speaker relay incorporating a switch on delay is essential due to the action of the servo and the single ended input stage. This can be extremely simple consisting of a FET, a C-R network and relay. Post #273 in another thread shows the idea of solid state relays developed into a working example. Credit for the idea of the SS relay goes to those mentioned in that thread.
My MOSFET amplifier designed for music. - Page 14 - diyAudio
4. alex mm' brilliant PCB designs. Post #300
My MOSFET amplifier designed for music. - Page 15 - diyAudio
5. The FET pinouts, post #113
My MOSFET amplifier designed for music. - Page 6 - diyAudio
6. Squarewave testing, posts #157 to 161
My MOSFET amplifier designed for music. - Page 8 - diyAudio
7. Heatsinks, post #164
My MOSFET amplifier designed for music. - Page 9 - diyAudio
8. A glowing endorsement, post #186 and this,
http://www.diyaudio.com/forums/soli...-amplifier-designed-music-10.html#post1567427
9. Spicing it up... LTspice files, post #312
http://www.diyaudio.com/forums/soli...-amplifier-designed-music-16.html#post3171018
10. And finally some of my benchmarks and my thoughts on how it sounds. The adventures of getting the design to where it stands today, post #107
http://www.diyaudio.com/forums/soli...t-amplifier-designed-music-6.html#post1539997
11. Further development of the design using parallel output devices to improve current delivery into adverse or low impedance loads. Circuit details and PCB layouts are in post #904
My MOSFET amplifier designed for music.
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This index of the thread should help you find the relevant important notes and general information.
1. The circuit diagram in this, post #1 is correct. The only omission is a 10 ohm 2 watt carbon/metal film across the output coil.
2. The TL071 opamp must not be substituted. This type works correctly on the single negative 12 volt rail. Other device types may not do so.
3. A speaker relay incorporating a switch on delay is essential due to the action of the servo and the single ended input stage. This can be extremely simple consisting of a FET, a C-R network and relay. Post #273 in another thread shows the idea of solid state relays developed into a working example. Credit for the idea of the SS relay goes to those mentioned in that thread.
My MOSFET amplifier designed for music. - Page 14 - diyAudio
4. alex mm' brilliant PCB designs. Post #300
My MOSFET amplifier designed for music. - Page 15 - diyAudio
5. The FET pinouts, post #113
My MOSFET amplifier designed for music. - Page 6 - diyAudio
6. Squarewave testing, posts #157 to 161
My MOSFET amplifier designed for music. - Page 8 - diyAudio
7. Heatsinks, post #164
My MOSFET amplifier designed for music. - Page 9 - diyAudio
8. A glowing endorsement, post #186 and this,
http://www.diyaudio.com/forums/soli...-amplifier-designed-music-10.html#post1567427
9. Spicing it up... LTspice files, post #312
http://www.diyaudio.com/forums/soli...-amplifier-designed-music-16.html#post3171018
10. And finally some of my benchmarks and my thoughts on how it sounds. The adventures of getting the design to where it stands today, post #107
http://www.diyaudio.com/forums/soli...t-amplifier-designed-music-6.html#post1539997
11. Further development of the design using parallel output devices to improve current delivery into adverse or low impedance loads. Circuit details and PCB layouts are in post #904
My MOSFET amplifier designed for music.
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