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MOSFET Amplifier IRFP240/IRFP9240
MOSFET Amplifier IRFP240/IRFP9240
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Old 24th June 2010, 08:17 PM   #261
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by apexaudio View Post
With +/-33V single pair of output FETs is enough, you can see circuit in post #239, and wireing in post #145. Bias adjust to get about 20mV on 0R47/5W resistor. Power will be about 50W on 8R load with +/-33V DC. You can use this amp for any aplication, and I think beginer can build it with my help.
Regards
You have to take into consideration transients when deciding on a power supply.

On my first self design MOSFET amp I used +/-40VDC and was surprised how quickly the transients got clipped.
I now never use a supply less than +/-60VDC.
I do play quite loud so perhaps you dont need such a high voltage.
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Old 24th June 2010, 08:27 PM   #262
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by nigelwright7557 View Post
You have to take into consideration transients when deciding on a power supply.

On my first self design MOSFET amp I used +/-40VDC and was surprised how quickly the transients got clipped.
I now never use a supply less than +/-60VDC.
I do play quite loud so perhaps you dont need such a high voltage.
I suggest +/-75V. Amplifier with +/-33V can be realise with LM3886 or TDA7294.
Regards
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Old 27th June 2010, 09:45 PM   #263
apexaudio is offline apexaudio  Serbia
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Default Hv350.2

HV350 with cut out protect
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File Type: jpg APEX MOSFET V2 sch.jpg (524.8 KB, 1999 views)
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Old 30th June 2010, 12:38 PM   #264
apexaudio is offline apexaudio  Serbia
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VI limiter, and cut out protect from HV350.2 can be add on all my amps.
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Old 1st July 2010, 11:58 AM   #265
mihailo is offline mihailo  Serbia
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Apex, can you look this chematics.
If it is ok, I would draw pcb for this because I have loot of IRFP250N fets.
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Old 1st July 2010, 12:13 PM   #266
apexaudio is offline apexaudio  Serbia
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Originally Posted by mihailo View Post
Apex, can you look this chematics.
If it is ok, I would draw pcb for this because I have loot of IRFP250N fets.
Better buy same number of IRFP9240 and build HV350,
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Old 4th July 2010, 02:18 PM   #267
najjachi is offline najjachi
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Hi apex, do you have PCB of HV350.2 with cut out protection?
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Old 4th July 2010, 04:14 PM   #268
apexaudio is offline apexaudio  Serbia
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Originally Posted by najjachi View Post
Hi apex, do you have PCB of HV350.2 with cut out protection?
Regards
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File Type: jpg APEX HV350.2.jpg (366.3 KB, 1701 views)
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Old 4th July 2010, 08:41 PM   #269
najjachi is offline najjachi
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Thanks, but i was mean the other PCB so how i'll be able to print and build the amplifier
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Old 4th July 2010, 10:04 PM   #270
apexaudio is offline apexaudio  Serbia
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Default Hv350.2 pcb

PCB size: 200x50mm
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File Type: jpg APEX HV350.2 pcb.jpg (301.2 KB, 1505 views)
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