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I wanted a good but relatively simple amplifier design to examine. This design is by Rod Elliot, who knows his stuff.
Here's the project page:
http://sound.whsites.net/project3a.htm
[Removed startup procedure for simulation as it no longer helps. You may want to leave it running for 11 minutes (= 2 seconds) to see it in its fully settled state.]
The potentiometer sets the quiescent current. It's not meant to be adjusted after initial setup. It's very sensitive, it would be a multi-turn type in real life.
~ Transistors
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Only hFe (forward beta) implemented, except power and drivers which got internal resistances dialled way down.
bc546 npn
hfe 110-450, using 300
bd140 pnp
hfe 40-250, using 150
bd139 npn
hfe 40-250, using 150
mjl4302 pnp
hfe 80-250, using 150
mjl4281 npn
hfe 80-250, using 150
MJL4302 and 4281 have the same datasheet.
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