NEW DESIGN L 150W FET AMPLIFIER

ljm_ljm · 29th June 2011, 02:52 PM

This is my new design of a level after amplifier.
It adopted VISHAY company produces the IRFP240 MOSFET. Each track six only.

This is a focus on low distortion of amplifiers, circuit structure asymmetrical sent fraction circuit. And must complementary structure.

After several times of modification and test. Main improvement is the reliability problems.

Now output can achieve + 65 V sine wave and good work.

astankov · 29th June 2011, 03:38 PM

PCB is good but can we see a schematic?

ljm_ljm · 29th June 2011, 04:23 PM

Quote:

Originally Posted by astankov

PCB is good but can we see a schematic?

Can. But I hope that this circuit is used only for reference. Because of the different parts will have to change some of the circuit structure.

I try to use different parameters.

In addition. The circuit structure similar to MK2 mosfet amplifier.

astankov · 30th June 2011, 01:06 PM

I think Q11 is connected in wrong way on the schematic isn't it ?

ljm_ljm · 30th June 2011, 02:43 PM

Quote:

Originally Posted by astankov

I think Q11 is connected in wrong way on the schematic isn't it ?

Sorry. Because I use of the pipe and software packages of different, just to from already the design is convenient.

In fact is different.

ljm_ljm · 30th June 2011, 03:28 PM

Only as a reference for circuit.

In the actual test is more effective method.

NMOS · 30th June 2011, 05:24 PM

Quote:

Originally Posted by ljm_ljm

Can. But I hope that this circuit is used only for reference. Because of the different parts will have to change some of the circuit structure.

I try to use different parameters.

In addition. The circuit structure similar to MK2 mosfet amplifier.

Ok this is quasicomplementary circuit, did you in your amp test symmetrical clipping ?

often quasicomplementary amps dont have symmmetrical clipping

Transistor Q20 is good solution, did you test this amp in real load condition and is it stable working ?

Boscoe · 06:44 PM

Did you make this board is it the the final revision?

Is there already a place to get them?

Is there someone selling these LJM designs on ebay?

Tekko · 30th June 2011, 06:51 PM

Pretty similar to the last mosfet amp i made, only major diff is the "upside down" PNP LTP. Transistor Q20 seem to serve the same function as the baxandall diode.

I had the same number of mosfets but got 214 watts continous unclipped into 4 ohms.

Boscoe · 30th June 2011, 08:13 PM

Quote:

Originally Posted by Tekko

Pretty similar to the last mosfet amp i made, only major diff is the "upside down" PNP LTP. Transistor Q20 seem to serve the same function as the baxandall diode.

I had the same number of mosfets but got 214 watts continous unclipped into 4 ohms.

Dis you design it? Have you got any info on it?

30th June 2011, 06:40 PM	#8
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	Did you make this board is it the the final revision? Is there already a place to get them? Is there someone selling these LJM designs on ebay? __________________ I thought about it once, but then thought again. Last edited by Boscoe; 30th June 2011 at 06:44 PM.

30th June 2011, 06:51 PM	#9
Tekko diyAudio Member Join Date: Jan 2005	Pretty similar to the last mosfet amp i made, only major diff is the "upside down" PNP LTP. Transistor Q20 seem to serve the same function as the baxandall diode. I had the same number of mosfets but got 214 watts continous unclipped into 4 ohms. __________________ The point of life is to build atleast one audio amplifier before you die.

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29th June 2011, 03:38 PM	#2
astankov diyAudio Member Join Date: Dec 2009 Location: Pernik	PCB is good but can we see a schematic?

30th June 2011, 01:06 PM	#4
astankov diyAudio Member Join Date: Dec 2009 Location: Pernik	I think Q11 is connected in wrong way on the schematic isn't it ?

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