GC As Driver Stage For High Current Amp?

lgreen · 27th February 2004, 02:34 PM

Hello, I am hoping to make a very high current but simple amp for a subwoofer. We are talking 2 and maybe 1 ohm load. Obviously that's too much current for a chip amp, but what if you used the chip amp to an output stage that had some high current power transistors? I have looked here over 100's of pages and have not seen a suitable circuit. The National data sheets show complicated arrangements and don't give me the level of current I am after. It of course would only need to be 1 channel.

Does anyone have a circ for a high current amp using a GC as the driver stage? Or if not, a circuit for just an output stage that provides high current? 10 amps? 20 amps?

Thanks

pinkmouse · 27th February 2004, 04:33 PM

I think Circlotron did something like this with a Quad current dumping type circuit a year or so ago, might be worth a search...

pinkmouse · 27th February 2004, 04:36 PM

Thought so, here you go...

djk · 28th February 2004, 03:21 PM

If you stick a couple of 1 ohm resistors in the power supply leads they can drive external outputs.

With a suitable supply, 400W at 1 ohm is possible.

27th February 2004, 02:34 PM	#1
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	GC As Driver Stage For High Current Amp? Hello, I am hoping to make a very high current but simple amp for a subwoofer. We are talking 2 and maybe 1 ohm load. Obviously that's too much current for a chip amp, but what if you used the chip amp to an output stage that had some high current power transistors? I have looked here over 100's of pages and have not seen a suitable circuit. The National data sheets show complicated arrangements and don't give me the level of current I am after. It of course would only need to be 1 channel. Does anyone have a circ for a high current amp using a GC as the driver stage? Or if not, a circuit for just an output stage that provides high current? 10 amps? 20 amps? Thanks

27th February 2004, 04:33 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I think Circlotron did something like this with a Quad current dumping type circuit a year or so ago, might be worth a search... __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

27th February 2004, 04:36 PM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Thought so, here you go... __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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28th February 2004, 03:21 PM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	If you stick a couple of 1 ohm resistors in the power supply leads they can drive external outputs. With a suitable supply, 400W at 1 ohm is possible.

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