N-Channel mosfet amplifier schematic needed - diyAudio
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Old 27th August 2004, 04:42 PM   #1
Nexus is offline Nexus  Netherlands
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Default N-Channel mosfet amplifier schematic needed

Hello dear DIY'ers,

I am looking for a working N-Channel mosfet amplifier schematic.

I looked into several threads, but didnot manage to find a complete schematic which is operative.

All schematics (with one or more mosfet pairs in the output stage are OK).

You can use my mail adress.

Thank you in advance:
Nexus
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Old 27th August 2004, 05:09 PM   #2
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What quality level are you looking for?

Hifi or PA?

How much power is needed?

I intend to publish a new N-channel design shortly.

Best regards

Lars Clausen
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Old 27th August 2004, 05:21 PM   #3
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In the JLH 10w Class A thread is a N-channel version which can be run in class B without modification.. it is a working design and it is build by me and another forum member... but also N Pass citation 12 mosfet version ... and some more which have not been build yet but have been simulated only so far...

goodluck


PS
Looking forward to your design Lars

edit

And offcrouse how could I forget.. X-pro's design... that's a real nice one.. look for x-pro posts...
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Old 27th August 2004, 05:25 PM   #4
Nexus is offline Nexus  Netherlands
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Hello Lars,

I am looking for a hifi design.

And I am looking forward for your design!


Best Regards:
Nexus
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Old 27th August 2004, 05:28 PM   #5
Nexus is offline Nexus  Netherlands
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Thank you for the input Tschrama.

I am looking for a design of about 40W.

Best Regards.
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Old 27th August 2004, 06:17 PM   #6
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Nexus: OK my current design is somewhat bigger than that, but
i will cook something up for you, and also test if it actually works in the real life :-) I will send you some schematics within a few days.

BTW do you go for simplicity or high performance? My ref design is ultra wide bandwidth, from 5 to 250.000 Hz (+0-1dB) and stable in any load of course.
However if 5-50.000 Hz is adequate it could be reduced in parts count.

Lars

40 Watts On the brink to War of Clones?
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Old 27th August 2004, 07:22 PM   #7
Nexus is offline Nexus  Netherlands
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Hello Lars,

I like the wide bandwidth, some more power is also OK (max. 50W).

I have developped a few amplifiers myself, but I have virtually no experience with mosfets.
(And currently no time to experiment ).

Best Regards:
Nexus
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Old 27th August 2004, 09:30 PM   #8
jleaman is offline jleaman  Belgium
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um the nchannel puts out a hell of alot more than 50watts why not choose something other than the n-channel ? what is wrong with getting the schematic off of www.aussieamplifiers.com
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Old 27th August 2004, 10:03 PM   #9
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Nexus: Now after a glass of wine, and a couple of hours, it's up and running in a 50W version. Quite easy to get it working actually, very stable, and sound is pretty good, i would say. But then it's also a nice red wine

It's based on 2 x IRF640N (the smallest MOSFET in the drawer). IRF530N or IRF540N would do just as well for 50W. (N versions have somewhat lower capacitances than the old ones).

I think most of us don't have much time to experiment, although this is really the fun part of DIY audio IMO. It helps tremendously to have a cradle setup, a unit with a safe power supply, heatsink with holes, in/out plugs, everything you need at hand, just ready to connect and play. Just mount in the parts, and turn on the power.
I think it took me just under two hours to build this 50 W amplifier from scratch.

The parts cost of the amp is LOW maybe 2-5 $ total, depending on where you buy.
Will send you the schematic when i get it drawn up. (Pretty soon).

Alll the best

Lars
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Old 27th August 2004, 10:51 PM   #10
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ok, maybe 2$ is a bit optimistic .. L
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