the irf240 does not have an emitter.
solution:- Take out all your FETs and select for equal Vgs at the operating current.
Am I wasting my time with unhelpful posts?
bad luck
that is why i said:
after his:
he did not take us seariously;me mistaking and you correcting...
that is why i said:
after his:
he did not take us seariously;me mistaking and you correcting...
replace 470R trim-pot with 1k trim-pot and than adjust bias as you wish,or
http://www.diyaudio.com/forums/soli...mplifier-irfp240-irfp9240-67.html#post3228580
yesterday i did some mesurments at home with APEX HV23 at about 11,5Ohm resistor. it has given to me 45V/3,55A , 48V/4,05A and 51V/4,33A without clipping. at 53V there was 4,5A but clipping appeared. this all was at 1kHz frequency from signal-generator and lasted for about 15sec per measuring voltage/current. i did about ten this mesuraments so the amp was really taken to it´s maximum limits. it has got heated up but not so much more than it gets when it reaches it´s working temperature. it has only been left to find someone willing to share it´s loudspeakers with my amplifier to test it "live" and with music program instead tone-generator.
http://www.diyaudio.com/forums/soli...mplifier-irfp240-irfp9240-67.html#post3228580
yesterday i did some mesurments at home with APEX HV23 at about 11,5Ohm resistor. it has given to me 45V/3,55A , 48V/4,05A and 51V/4,33A without clipping. at 53V there was 4,5A but clipping appeared. this all was at 1kHz frequency from signal-generator and lasted for about 15sec per measuring voltage/current. i did about ten this mesuraments so the amp was really taken to it´s maximum limits. it has got heated up but not so much more than it gets when it reaches it´s working temperature. it has only been left to find someone willing to share it´s loudspeakers with my amplifier to test it "live" and with music program instead tone-generator.
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not in my case because i have +/-75V supply. i can adjust it to a 100mA per pair but i don't have heatsinks to cool it down,also it sounds the same with 15 and 100mA bias so why to exaggerate.
i don't know how much power you will get with +/-63V supply,but it is to be expected about 200W/8R and 300W/4R load. let us know when you measure!
i don't know how much power you will get with +/-63V supply,but it is to be expected about 200W/8R and 300W/4R load. let us know when you measure!
Shelah, you don't need fans with those huge heatsinks!
It depends on how long it is switched on for and if the case has openings for airflow.
I used a similar setup in a pc case and after a couple of hours of high power I couldn't bear my hand on the pc case. So I fitted a couple of fans and it was fine after that.