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Old 26th December 2010, 02:20 PM   #1
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Default 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.
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Old 26th December 2010, 02:45 PM   #2
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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?
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Old 26th December 2010, 02:50 PM   #3
Krisfr is offline Krisfr  United States
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Which Laterals are you using?

Do you need 2N3773's?
I may have some...
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Never give a Systems Analyst a screwdriver or hammer
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Old 26th December 2010, 02:53 PM   #4
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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.
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Old 26th December 2010, 08:57 PM   #5
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Here are pics of the amp:
http://i.imgur.com/w232K.jpg
http://i.imgur.com/KaiwP.jpg
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Old 27th December 2010, 07:41 PM   #6
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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
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Old 27th December 2010, 08:40 PM   #7
mlloyd1 is offline mlloyd1  United States
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please heed sawreyrw's warning or make sure you are not driving any valuable speakers.

mlloyd1

Quote:
Originally Posted by sawreyrw View Post
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?
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Old 27th December 2010, 08:52 PM   #8
wahab is offline wahab  Algeria
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Quote:
Originally Posted by mlloyd1 View Post
make sure you are not driving any valuable speakers.

mlloyd1
Wise advice.....
Sometimes, i regret the capacitively coupled amps times...
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Old 27th December 2010, 09:20 PM   #9
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Not to worry. On the board, 2N5401/5551 are used, just forgot to change in simulation.
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Old 31st December 2010, 12:55 PM   #10
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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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