Really simple lateral mosfet amplifier

Tekko · 26th December 2010, 02:20 PM

Since the 2N3773's were a bust, i dug out the laterals again and put together this simple circuit:

http://i.imgur.com/N90pr.jpg

For beeing so simple it sounds really really good, treble is crystal clear and bass is hard as a rock!!

I'm already improving the circuit in simulation such as adding degeneration to the LTP.

Im running 100.0mA bias.

sawreyrw · 26th December 2010, 02:45 PM

I'm surprised this circuit works at all. The 2N3904 and 2N3906 are 40 volt parts. Will the MOSFETs be able to supply 110 watts to a 4 ohm load? Have you actually built it?

Krisfr · 26th December 2010, 02:50 PM

Which Laterals are you using?

Do you need 2N3773's?
I may have some...

Tekko · 26th December 2010, 02:53 PM

I'm listening to it as im typing this. I've had it to hard clipping into 3.9 ohms with no ill effects, havent measured power though, but i'd say its around 50 watts peak in 4 ohms.

Tekko · 26th December 2010, 08:57 PM

Here are pics of the amp:
http://i.imgur.com/w232K.jpg
http://i.imgur.com/KaiwP.jpg

Tekko · 27th December 2010, 07:41 PM

After some more work this circuit now simulates 0.03% THD in 1kHz, 0.06% THD in 10kHz and 0.2% THD in 20kHz.

It sounds better than my other diy amplifiers!!!

http://i.imgur.com/M2VpC.jpg

mlloyd1 · 27th December 2010, 08:40 PM

please heed sawreyrw's warning or make sure you are not driving any valuable speakers.

mlloyd1

Quote:

Originally Posted by sawreyrw

I'm surprised this circuit works at all. The 2N3904 and 2N3906 are 40 volt parts. Will the MOSFETs be able to supply 110 watts to a 4 ohm load? Have you actually built it?

wahab · 27th December 2010, 08:52 PM

Quote:

Originally Posted by mlloyd1

make sure you are not driving any valuable speakers.

mlloyd1

Wise advice.....
Sometimes, i regret the capacitively coupled amps times...

Tekko · 27th December 2010, 09:20 PM

Not to worry. On the board, 2N5401/5551 are used, just forgot to change in simulation.

Tekko · 31st December 2010, 12:55 PM

This amp is now souped up with dual output pairs, its currently driving a 2 ohm load, and its by far the best sounding of my diy mosfet amps.

26th December 2010, 02:20 PM	#1
Tekko diyAudio Member Join Date: Jan 2005	Really simple lateral mosfet amplifier Since the 2N3773's were a bust, i dug out the laterals again and put together this simple circuit: http://i.imgur.com/N90pr.jpg For beeing so simple it sounds really really good, treble is crystal clear and bass is hard as a rock!! I'm already improving the circuit in simulation such as adding degeneration to the LTP. Im running 100.0mA bias.

26th December 2010, 02:50 PM	#3
Krisfr diyAudio Member Join Date: Nov 2007 Location: near the House of the Mouse	Which Laterals are you using? Do you need 2N3773's? I may have some... __________________ Thanks Never give a Systems Analyst a screwdriver or hammer

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26th December 2010, 02:45 PM	#2
sawreyrw diyAudio Member Join Date: Apr 2006 Location: Minnesota	I'm surprised this circuit works at all. The 2N3904 and 2N3906 are 40 volt parts. Will the MOSFETs be able to supply 110 watts to a 4 ohm load? Have you actually built it?

26th December 2010, 02:53 PM	#4
Tekko diyAudio Member Join Date: Jan 2005	I'm listening to it as im typing this. I've had it to hard clipping into 3.9 ohms with no ill effects, havent measured power though, but i'd say its around 50 watts peak in 4 ohms.

26th December 2010, 08:57 PM	#5
Tekko diyAudio Member Join Date: Jan 2005	Here are pics of the amp: http://i.imgur.com/w232K.jpg http://i.imgur.com/KaiwP.jpg

27th December 2010, 07:41 PM	#6
Tekko diyAudio Member Join Date: Jan 2005	After some more work this circuit now simulates 0.03% THD in 1kHz, 0.06% THD in 10kHz and 0.2% THD in 20kHz. It sounds better than my other diy amplifiers!!! http://i.imgur.com/M2VpC.jpg

27th December 2010, 09:20 PM	#9
Tekko diyAudio Member Join Date: Jan 2005	Not to worry. On the board, 2N5401/5551 are used, just forgot to change in simulation.

31st December 2010, 12:55 PM	#10
Tekko diyAudio Member Join Date: Jan 2005	This amp is now souped up with dual output pairs, its currently driving a 2 ohm load, and its by far the best sounding of my diy mosfet amps.

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