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Old 9th October 2005, 07:56 AM   #1
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Lightbulb One Idea from PASS's ALEPH-L

I design an 40W audio amplifier cicuit recent...
using one J-FET as pre-gain, ALEPH-L as driver stage,and IRFP240/9240 be class-AB operating.
RP1 for adjust the output terminal voltage,set 0V to ground;
RP2 for adjust the output MOS Iq at 300~400mA...
I didn't do any examination with it before I post this schematics,
I think it would sounds as sweet as ALEPH-L,and more save energy than CLASS-A operation circuit.

now,have a look this circuit schematics:
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Old 9th October 2005, 07:59 AM   #2
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and here is the output voltage & phase curve graph:
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Old 9th October 2005, 08:05 AM   #3
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question:
can it works?
I'm so care about it's output terminal voltage,can it always be 0V to ground(it's stability)???
Any problem? please remind me,thank you!

have fun!
WINCO
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Old 9th October 2005, 09:31 AM   #4
tlf9999 is offline tlf9999  United States
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it should work. it is essentially a JLH class B or NAD3020. I also posted a similar circuit (bjt upfront tho.) a while ago. and I have a working prototype of it as well.

It sounds sweet, but the DC control is poor and once overdriven it exhibits pretty nasty clipping behaviors as well.
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Old 10th October 2005, 01:37 AM   #5
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Quote:
Originally posted by tlf9999
it should work. it is essentially a JLH class B or NAD3020. I also posted a similar circuit (bjt upfront tho.) a while ago. and I have a working prototype of it as well.

It sounds sweet, but the DC control is poor and once overdriven it exhibits pretty nasty clipping behaviors as well.
thanks,tlf9999:
I do simulation lastnight,Using a j-fet as pre-stage suitable for DC control...
I make a mistake that the Q4's "(2SJ77)",It should be 2SJ74...sorry for this fault!

regards
WINCO
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