Help! Power Amp

mgm2000ro · 18th May 2006, 12:56 PM

Hello everybody!
My knowledge of class D amplifier are few and i wish to build an power amplifier. I've builded so far an 1000W amp, wich is a clone of an auto amp (i don't give the name because i don't want to make publicity). The amp works fine, the schematic is here. The final final tranzistors are IRF complementary p and n.
I wish to modify this schematic, precisley the power stage because it uses p-mos and n-mos final tranzistors and i want to replace and modify p-fet into n-fet.
Concluzion: the entire final trazistors of power stage to be N-FET.
Any sugestion is welcomed.
SCHEMATIC : http://img19.imageshack.us/img19/9589/a6rg.jpg

P.S.:In the schematic i drawed only a pair of final tranzistors. In fact there are 6 pairs.
Help me pls!

cicero32 · 18th May 2006, 01:11 PM

This seem a critical amplifier, duplicate it will be a problematic job;
you mus take in account feedbak coupling, oscillation etc etc.
The final stages seem be critical and redesign with no gain change should be problematic.Are sure you are ready for this adventure?

cicero32

mgm2000ro · 18th May 2006, 01:18 PM

Any sugestion is welcomed!!
Draw your sugestion!!

mgm2000ro · 18th May 2006, 01:22 PM

circuit integrat op= tl074 ,MC14060 & comparators lm361

fredos · 18th May 2006, 01:24 PM

That's exactly the same power stage I use In my old model 1200...They should not need 6 pair of output per channel, at +/-45V 1 pair should be lot enaught. Look at the thread of class d PCB needed, you will find my schematics. To use n-FET in upper stage, only use a 6N137 opto with a TC4429CPA mosfet drivers. Drive the opto coupler out-of-phase of you lower output (that will be easy, you have out-of-phase signal from your comparator) and enjoy it!

PS just add diode to discharge mosfet gate faster, this will help you a lot!

Fredos

www.d-amp.com

fredos · 18th May 2006, 01:27 PM

The thread...

Class-D Amp PCB needed

mgm2000ro · 18th May 2006, 02:35 PM

I dont find TC4429 in RO.

kartino · 19th May 2006, 12:48 AM

Why dont you use simple IR2011 driver? Lot of design found in this forum. But you need to design level sifter for IR2011.

So you have two options, using mosfet driver with level shifter and like fredos said.

18th May 2006, 12:56 PM	#1
mgm2000ro diyAudio Member Join Date: Nov 2004 Location: Bucharest	Help! Power Amp Hello everybody! My knowledge of class D amplifier are few and i wish to build an power amplifier. I've builded so far an 1000W amp, wich is a clone of an auto amp (i don't give the name because i don't want to make publicity). The amp works fine, the schematic is here. The final final tranzistors are IRF complementary p and n. I wish to modify this schematic, precisley the power stage because it uses p-mos and n-mos final tranzistors and i want to replace and modify p-fet into n-fet. Concluzion: the entire final trazistors of power stage to be N-FET. Any sugestion is welcomed. SCHEMATIC : http://img19.imageshack.us/img19/9589/a6rg.jpg P.S.:In the schematic i drawed only a pair of final tranzistors. In fact there are 6 pairs. Help me pls!

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18th May 2006, 01:11 PM	#2
cicero32 diyAudio Member Join Date: Mar 2005 Location: Rimini	This seem a critical amplifier, duplicate it will be a problematic job; you mus take in account feedbak coupling, oscillation etc etc. The final stages seem be critical and redesign with no gain change should be problematic.Are sure you are ready for this adventure? cicero32

18th May 2006, 01:18 PM	#3
mgm2000ro diyAudio Member Join Date: Nov 2004 Location: Bucharest	Any sugestion is welcomed!! Draw your sugestion!!

18th May 2006, 01:22 PM	#4
mgm2000ro diyAudio Member Join Date: Nov 2004 Location: Bucharest	circuit integrat op= tl074 ,MC14060 & comparators lm361

18th May 2006, 01:24 PM	#5
fredos diyAudio Member Join Date: Mar 2005 Location: Quebec	That's exactly the same power stage I use In my old model 1200...They should not need 6 pair of output per channel, at +/-45V 1 pair should be lot enaught. Look at the thread of class d PCB needed, you will find my schematics. To use n-FET in upper stage, only use a 6N137 opto with a TC4429CPA mosfet drivers. Drive the opto coupler out-of-phase of you lower output (that will be easy, you have out-of-phase signal from your comparator) and enjoy it! PS just add diode to discharge mosfet gate faster, this will help you a lot! Fredos www.d-amp.com

18th May 2006, 01:27 PM	#6
fredos diyAudio Member Join Date: Mar 2005 Location: Quebec	The thread... Class-D Amp PCB needed

18th May 2006, 02:35 PM	#7
mgm2000ro diyAudio Member Join Date: Nov 2004 Location: Bucharest	I dont find TC4429 in RO.

19th May 2006, 12:48 AM	#8
kartino diyAudio Member Join Date: Feb 2005 Location: Gunungkidul Indonesia	Why dont you use simple IR2011 driver? Lot of design found in this forum. But you need to design level sifter for IR2011. So you have two options, using mosfet driver with level shifter and like fredos said.

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