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:
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:
Attachments
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.
It sounds sweet, but the DC control is poor and once overdriven it exhibits pretty nasty clipping behaviors as well.
tlf9999 said: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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