What input stage(s) for a small power amp ? - diyAudio
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Old 3rd September 2015, 09:19 AM   #1
00940 is offline 00940  Belgium
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Default What input stage(s) for a small power amp ?

I'm searching for options to add input stages to a small output stage board. The output stage is very conventionnal, EF2 with a pair of 2sc5200/2sa1943 and vbe multiplier onboard. The planned power supply is around +/-28 to +/-30V. The output stage pcb will be attached vertically to the heatsink and the input stage pcb will be attached to it (see the row of connectors at the bottom).

As it is, I'm considering the baby Aksa and the Symasym. I'd like to keep it relatively simple as the input stage pcb will be max 5*5cm (with smd of needed).

Any suggestions ?

Btw, I attach the output stage pcb. Comments are of course welcome.

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Old 3rd September 2015, 02:54 PM   #2
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The Blameless conceptual model amplifier is a good place to start. You can know in advance the standard to expect, provided the layout is good and you don't have large ground and supply loops around the boards.
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Old 6th September 2015, 12:12 AM   #3
djk is offline djk
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I've made many Pass A40 adapted to different voltages (up to ±95V) and biased in class AB.

Candidates for the Darwin Award should not read this author.
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