N-Channel mosfet amplifier schematic needed

Nexus · 27th August 2004, 03:42 PM

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

Lars Clausen · 27th August 2004, 04:09 PM

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

tschrama · 27th August 2004, 04:21 PM

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...

Nexus · 27th August 2004, 04:25 PM

Hello Lars,

I am looking for a hifi design.

And I am looking forward for your design!

Best Regards:
Nexus

Nexus · 27th August 2004, 04:28 PM

Thank you for the input Tschrama.

I am looking for a design of about 40W.

Best Regards.

Lars Clausen · 27th August 2004, 05:17 PM

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?

Nexus · 27th August 2004, 06:22 PM

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

jleaman · 27th August 2004, 08:30 PM

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

Lars Clausen · 27th August 2004, 09:03 PM

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

Lars Clausen · 27th August 2004, 09:51 PM

ok, maybe 2$ is a bit optimistic

.. L

27th August 2004, 03:42 PM	#1
Nexus diyAudio Member Join Date: Aug 2003 Location: The Netherlands	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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

27th August 2004, 04:09 PM	#2
Lars Clausen diyAudio Member Join Date: Oct 2003 Location: The Lab	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

27th August 2004, 04:21 PM	#3
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	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...

27th August 2004, 04:25 PM	#4
Nexus diyAudio Member Join Date: Aug 2003 Location: The Netherlands	Hello Lars, I am looking for a hifi design. And I am looking forward for your design! Best Regards: Nexus

27th August 2004, 04:28 PM	#5
Nexus diyAudio Member Join Date: Aug 2003 Location: The Netherlands	Thank you for the input Tschrama. I am looking for a design of about 40W. Best Regards.

27th August 2004, 05:17 PM	#6
Lars Clausen diyAudio Member Join Date: Oct 2003 Location: The Lab	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?

27th August 2004, 06:22 PM	#7
Nexus diyAudio Member Join Date: Aug 2003 Location: The Netherlands	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

27th August 2004, 08:30 PM	#8
jleaman Banned Join Date: Apr 2002	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

27th August 2004, 09:03 PM	#9
Lars Clausen diyAudio Member Join Date: Oct 2003 Location: The Lab	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

27th August 2004, 09:51 PM	#10
Lars Clausen diyAudio Member Join Date: Oct 2003 Location: The Lab	ok, maybe 2$ is a bit optimistic .. L

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)