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Old 10th December 2012, 02:25 PM   #691
44250 is offline 44250  Serbia
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replace 470R trim-pot with 1k trim-pot and than adjust bias as you wish,or

MOSFET Amplifier IRFP240/IRFP9240

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 itīs maximum limits. it has got heated up but not so much more than it gets when it reaches itīs working temperature. it has only been left to find someone willing to share itīs loudspeakers with my amplifier to test it "live" and with music program instead tone-generator.

Last edited by 44250; 10th December 2012 at 02:27 PM.
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Old 12th December 2012, 07:33 AM   #692
Shelah is offline Shelah  Zambia
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so in other words, 30-50mA is the range to bias if the trimpot is 1k? and also the voltage i intend to use is 44-0-44 ac. i know power will be lower than the expected but its worth the try.
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Old 12th December 2012, 07:59 AM   #693
44250 is offline 44250  Serbia
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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!
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Old 13th December 2012, 06:44 AM   #694
Shelah is offline Shelah  Zambia
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thanks 44250. let me see how it performs.
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Old 13th December 2012, 07:04 AM   #695
44250 is offline 44250  Serbia
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i am expecting some good news!
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Old 9th January 2013, 04:16 PM   #696
Shelah is offline Shelah  Zambia
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44250, i need the bias proceedure. things like initial values of resistances before and other information that i may need in this area.
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Old 4th February 2013, 10:28 AM   #697
Shelah is offline Shelah  Zambia
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i present to you DIY apex HV23.
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Old 4th February 2013, 02:51 PM   #698
HighTec is offline HighTec  Croatia
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Shelah, you don't need fans with those huge heatsinks!
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Old 4th February 2013, 02:56 PM   #699
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Quote:
Originally Posted by HighTec View Post
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.
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Old 4th February 2013, 02:57 PM   #700
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Originally Posted by Shelah View Post
i present to you DIY apex HV23.
hardwork. good heatsink.
what purpose u made with vero board?
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