10 Watt Single End, JFET input - Lateral N-MOSFET output - Page 9

gaborbela · 30th July 2009, 06:25 AM

Hello revintage

The schematic you made sim. on it is biased in Class A or A/B .
Interesting , not many amplifiers in the forum or even the market uses real lateral mosfet in SE mode like 2SK1058 .
Do you think these amp would work properly .
I still didn't finished yet the original Widowmaker amplifier but soon I'll and I test it .
I was sick unfortunately .
Greets

AndrewT · 30th July 2009, 10:26 AM

Hi Gab,
have another look at the schematic.
The lower FET is set up as a constant current sink (CCS).
The upper FET is set up as a single ended source follower (common drain).
It cannot be anything else but ClassA.

gaborbela · 30th July 2009, 06:23 PM

Hello

Thanks AndrewT .
Mostly I ask that question because I thought someone will give a advise about the size of the heatsink required and if these schematic would work in real life. OK they did some sim test but usually that not 100% proof the circuit will work if someone give a try .
Thank any way .

Greets

30th July 2009, 10:26 AM	#82
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Gab, have another look at the schematic. The lower FET is set up as a constant current sink (CCS). The upper FET is set up as a single ended source follower (common drain). It cannot be anything else but ClassA. __________________ regards Andrew T.

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30th July 2009, 06:25 AM	#81
gaborbela diyAudio Member Join Date: Sep 2005	Hello revintage The schematic you made sim. on it is biased in Class A or A/B . Interesting , not many amplifiers in the forum or even the market uses real lateral mosfet in SE mode like 2SK1058 . Do you think these amp would work properly . I still didn't finished yet the original Widowmaker amplifier but soon I'll and I test it . I was sick unfortunately . Greets

30th July 2009, 06:23 PM	#83
gaborbela diyAudio Member Join Date: Sep 2005	Hello Thanks AndrewT . Mostly I ask that question because I thought someone will give a advise about the size of the heatsink required and if these schematic would work in real life. OK they did some sim test but usually that not 100% proof the circuit will work if someone give a try . Thank any way . Greets

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