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Old 13th April 2010, 03:59 PM   #31
maouna is offline maouna  Greece
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will it be ok if i use 24-0-24 transformer?will the clip indicator,short circuit protection and dc protect work correctly???

Last edited by maouna; 13th April 2010 at 04:05 PM.
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Old 13th April 2010, 04:18 PM   #32
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Quote:
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will it be ok if i use 24-0-24 transformer?will the clip indicator,short circuit protection and dc protect work correctly???
Yes, but some resistor value need to be changed.
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Old 2nd May 2010, 10:22 PM   #33
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I must say this is my most popular small PA amplifier in 90's. Over 400 pcbs in bars, restaurants, small clubs... still works.
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Old 7th May 2010, 08:24 AM   #34
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F100 can work with TO220 fets IRF640/IRF9640 or IRF540/IRF9540 if rail voltage is +/-45Vmax.
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Old 25th May 2010, 12:06 PM   #35
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I find this old pcb, same schematics with 5 pairs of mosfets, bias adjustment and protect on board, but files was lost.
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Old 29th May 2010, 06:50 AM   #36
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After 15 years work...
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Old 29th May 2010, 07:01 AM   #37
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I'm considering to remake this good old amps with some improvements...
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Old 29th May 2010, 09:55 AM   #38
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apex,
this design is +/-50 but i need replacement
bd139 MJE?
bf420 MPSA?
and i'd rather make 4 pairs of output
should i make .22r resistor .33 or .47?
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Old 29th May 2010, 09:55 AM   #39
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I'm not a big fan of solid state, but I have some questions!

I do not understand why you have C2 as well as C1.
What are the big 0.22R resistors for?
What is the loop feedback gain/amount?
What is the crossover distortion with the loop feedback removed?
I think you need a bias so you can also run in class AB (my opinion)
Why is there no bypass cap for the zener of the driver circuit?
Why is there no Zobel network (LC) on the output?
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Old 29th May 2010, 12:18 PM   #40
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Quote:
Originally Posted by engel dela pena View Post
apex,
this design is +/-50 but i need replacement
bd139 MJE?
bf420 MPSA?
and i'd rather make 4 pairs of output
should i make .22r resistor .33 or .47?
If you want 4 pairs of output I sugest you to build this amp:
MOSFET Amplifier IRFP240/IRFP9240
Regards
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