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Old 12th June 2015, 12:54 PM   #1
diyAudio Member
Join Date: Jun 2015
Default My own 80W/8R amplifier need help

Hi, I want to design my first amplifier, but I can't simulate the shematic.
There is the LTSpice software but I don't have the transistors models.
Can anyone tell me if the schematic is good?

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Old 12th June 2015, 10:35 PM   #2
diyAudio Member
Join Date: Nov 2004
Location: Germany
It might help tremendously if the schematic were actually visible. This is why you can attach files here.

I see nothing that Mr. Cordell and this thread couldn't fix.

BTW, you'd be better advised to go with KSC3503/KSA1381 for Q9/10. BD139/140 make fairly lousy VAS transistors.

Circuit is also missing output inductor (~1 mH air, || 4.7...10 ohm) and Zobel network, hopefully still to be added.
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