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Old 24th May 2009, 10:17 PM   #1
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Default IRFP240/9240 amp Schematics

I'm looking for what i would describe as a textbook type schematic that uses the 240/9240 series of mosfets for the output stage. Single Long tailed pair input, 2-4 transistor driver stage, plus bias, VI limiters, 2-8 IRFP240/9240 type outputs etc. The basic RCA handbook type amp. the power output of the amp is not important as the schematic will only be used for a discussion.

Anyone familiar with a commercially available product that uses such an amp stage?
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Old 24th May 2009, 10:43 PM   #2
lineup is offline lineup  Sweden
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In searched diyaudio.com
via google

diyaudio.com power amplifier mosfet IRFP240 IRFP9240
828 hits.... I leave it upto you to find something interesting

Here is another search, as I know Nelson Pass (see his forum) has used IRF240/9240 in a number of power amp designs
diyaudio.com nelson pass IRF240 IRF9240
This forum search rendered 45 hits

Regars
lineup Likes the pair of IRFP240 + IRFP9240 MOSFET = a good choice
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Old 24th May 2009, 11:11 PM   #3
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Default Re: IRFP240/9240 amp Schematics

Quote:
Originally posted by Zero Cool
I'm looking for what i would describe as a textbook type schematic that uses the 240/9240 series of mosfets for the output stage. Single Long tailed pair input, 2-4 transistor driver stage, plus bias, VI limiters, 2-8 IRFP240/9240 type outputs etc. The basic RCA handbook type amp. the power output of the amp is not important as the schematic will only be used for a discussion.

Anyone familiar with a commercially available product that uses such an amp stage?

I sell a similar product.
It uses IRFP240/9240.
It has a LTP with a current source.
The VAS has a current source too.
Sadly it doesnt have over current or thermal protection.
I tend to use big heatsinks and fans to get rid of any heat.
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Old 25th May 2009, 04:24 AM   #4
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Quote:
Originally posted by lineup
In searched diyaudio.com
via google

diyaudio.com power amplifier mosfet IRFP240 IRFP9240
828 hits.... I leave it upto you to find something interesting

Here is another search, as I know Nelson Pass (see his forum) has used IRF240/9240 in a number of power amp designs
diyaudio.com nelson pass IRF240 IRF9240
This forum search rendered 45 hits

Regars
lineup Likes the pair of IRFP240 + IRFP9240 MOSFET = a good choice

Thanks, believe me i did not just come here and post this without searching first. i have been trying different search combination keywords for 2 days now. and Nelsons designs while great are not what i am looking for for this exercise




nigelwright7557 care to share your schematic? you can email it to me at tetech2@doitnow.com
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Old 25th May 2009, 04:39 AM   #5
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ZC -YGM

Maybe it's of interest....
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Old 25th May 2009, 04:59 AM   #6
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Quote:
Anyone familiar with a commercially available product that uses such an amp stage?
Look up the Genesis stealth power amp , It uses 8 pairs of them to burn up 3600VA's of pure Class A power. Can heat half a house with full bias setting and is 160LBS !!

In the quasi amp lineup (power amp under development) , the NMOS 200 /350 are perfect for the IRFP line , one could just go fully complimentary with a few component changes. In fact most DIY AB amps can easily be ported to the IRFP's. I ran a symasym with higher rails , and the mosfets worked seamlessly with minimal changes.

OS
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Old 25th May 2009, 05:23 AM   #7
lineup is offline lineup  Sweden
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Quote:
Originally posted by Zero Cool

Thanks, believe me i did not just come here and post this without searching first.
Just in case you did not find.
And there are other than you reading this topic. I am sure
Let them find some use for their IRFP240/9240, too.
They are nice devices. Me too thinks so.

Regars - once more
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Old 25th May 2009, 10:05 AM   #8
AndrewT is offline AndrewT  Scotland
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I have read recommendations to use Google to search our Forum threads.
Thanks for the examples of how it is to be done.
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Old 25th May 2009, 03:38 PM   #9
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mpmarino - Thanks that's perfect!


Thanks everyone else. This is not something i am going to build. just for example for a discussion with a friend.
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