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Old 1st December 2007, 08:52 PM   #1
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Cool FET audio amplifier - the best amplifer

Hello to every people.

Present most simple still more good audio amplifier with MOSFET.
Power on loads of 4 Ohmi is about 180W, +/-55Vdc. The amplifier feels up to a power of as far as 300W in to 4 Ohmi with +/-70Vdc if I done next substitutions:
BC640 = 2N5401 (atention for pin C, B, E transitors 2N5401, Isn't identically with transistor BC640);
BC639 = MPSA42.

MJE350 is willed mounted heat-sink.

Enjoy.
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File Type: pdf amplficator audio cu mosfet.pdf (82.1 KB, 1504 views)
 
Old 2nd December 2007, 06:38 AM   #2
taj is offline taj
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I don't know about the circuit, but the PCB design sure is nice. Not sure about "the best amplifer" and "The best electronics designer in the world" stuff. I hope I'm mis-reading that.

..Todd
 
Old 2nd December 2007, 09:23 AM   #3
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Quote:
but the PCB design sure is nice.
.
Thanks man.
Quote:
Not sure about "the best amplifer" and "The best electronics designer in the world" stuff. I hope I'm mis-reading that.
taj, don't know me, but isn't PCB that l achieved it. I do the specification as the my occupation is of electric engineer and I projected and builded the all my in activity of by now many audio system. These amplifier is most he succeeds and most healthy; presenting a minimum of electronic component for obtain the good more performance.

I present hereinafter for the people interested, one of the most good input circuit for audio professional amplifiers design by me.
audio circuit input amplifier.pdf - 0.18MB

Apologize for the englishman but expect the saddle apprehends me.
 
Old 2nd December 2007, 09:54 AM   #4
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very nice to se circuit also ...... seems that pcb is perfect job .. bravo !!!!

lets see the schematic also

( willing to buy if its for sale )
 
Old 2nd December 2007, 11:19 AM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
do we get to see the schematic of the power amp in post1?
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Old 2nd December 2007, 12:20 PM   #6
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I would like to see this "Best amplifier" schematic also.
 
Old 2nd December 2007, 12:24 PM   #7
Donk is offline Donk  Europe
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Guys, the schematic is like the "Maplin mosfet amp kit" (~ Toshiba appnote circuit) but with more outputs.

Anyway, Donpetru's circuit is bad! IRFP vertical hexfets without thermal coupled bias circuit? Crazy idea.
The circuit would work right only with lateral mosfets (like 2sk1058/2sj162, etc...)

Cheers
 
Old 2nd December 2007, 12:42 PM   #8
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Not another internet amplifier
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Old 2nd December 2007, 12:43 PM   #9
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I'd could listen to the Donk for hours without understanding a word.

Maybe Don-Petruioni likes it hot, or he has something hidden under the flaming red hot PCB ?
Or did i read something about 350 something ?
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Old 2nd December 2007, 12:43 PM   #10
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Quote:
Anyway, Donpetru's circuit is bad! IRFP vertical hexfets without thermal coupled bias circuit? Crazy idea.
The thermal coupled bias circuits is need (indispensable) when temperature heatsink is more (1.5-2)*Tamb, Tamb=25-30 grad Celsius. As a matter of fact this he is an important condition then when makes this amplifier. This one is transliterated certain the minimum value coefficient heatsink (gradCelsius per watt).
In in addition, to the amplifiers with MOSFET transitors is not obligatory use bias circuit as the to one with bipolar transitors if respected condition.
Diagram thereto did PCB audio amplifier is one diagram precinct 20 years slow and work very good. I admit as isn't a perfect diagram gift but is a good amplifier for made in the regime DIY.
 

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