Modifying 200W gainclone circuit

soundNERD · 6th July 2006, 12:34 AM

I'm trying to modify the following circuit to work with a single, non bridged LM3886.

A lot of parts appear unneccesary, like the 2.2k resistors between power supplies, cap/resistor across driver, etc.

And since each side isn't identical, so I'm not exactly sure where to start removing comonents.

What can I remove from this circuit to use it with a single LM3886 with a pair of MJ15003/MJ15004 transistors. I'm looking for power over quality here, it's going to be driving a horn subwoofer so although sound quality is important, power output is even more important.

lndm · 6th July 2006, 01:38 AM

The 2k2's across the supply appear to be creating a ground reference. The cap and resistor across the driver are there for stability, a speakers load typically rises beyond the spectrum. I'd leave those there.

soundNERD · 6th July 2006, 01:48 AM

But the 3886 requires split supply so a physical ground is there anyway. Or do you mean something else?

lndm · 6th July 2006, 01:58 AM

The schematic showed a non centre tapped supply. Of course you'll want to add one

6th July 2006, 12:34 AM	#1
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	Modifying 200W gainclone circuit I'm trying to modify the following circuit to work with a single, non bridged LM3886. A lot of parts appear unneccesary, like the 2.2k resistors between power supplies, cap/resistor across driver, etc. And since each side isn't identical, so I'm not exactly sure where to start removing comonents. What can I remove from this circuit to use it with a single LM3886 with a pair of MJ15003/MJ15004 transistors. I'm looking for power over quality here, it's going to be driving a horn subwoofer so although sound quality is important, power output is even more important.

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6th July 2006, 01:38 AM	#2
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	The 2k2's across the supply appear to be creating a ground reference. The cap and resistor across the driver are there for stability, a speakers load typically rises beyond the spectrum. I'd leave those there.

6th July 2006, 01:48 AM	#3
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	But the 3886 requires split supply so a physical ground is there anyway. Or do you mean something else?

6th July 2006, 01:58 AM	#4
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	The schematic showed a non centre tapped supply. Of course you'll want to add one

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