Amp using (only) IRFP260 output devices

cyr · 21st May 2004, 03:06 PM

I have a bunch of IRFP260 that I would like to use in a multi-channel amp for a future biamped home theater setup (10+ channels).

I would like to use 2 or 4 of the IRFP260 per channel, and use mostly surface mount for the other components to keep it compact. Each channel should be capable of ~100W in 8ohm.

So now I'm looking for any schematics or advice to inspire me

azira · 21st May 2004, 03:31 PM

Given your constraints you've got one option that I can think of.

Build a Zen light with a pretty high bias.. maybe 7A or 8A per channel. That might give you 100W peak into 8-ohms per channel using a single gain device. You might need more bias current still... You can parallel channels at 1/2 bias to help with keeping them from burning out.

Really, unless you're planning on adding/allowing more transistors (as in 'P' types or some inverting BJTs for a quasi) you can only make a SE class A...

Make sure you have a nice LARGE heatsink... you'll be needing it.
--
Danny

slowhands · 21st May 2004, 03:33 PM

Anthony Holton's N-channel amp uses all N-channel devices for outputs. It's in revision, and he has been "on honeymoon", so it has been hard to get the schematic (grrrr...), but here is a pointer to the physical layout of the new revision:

http://www.aussieamplifiers.com/New%20N-channel.htm

The old version used fewer output devices, depicted here:
http://www.aussieamplifiers.com/n-channe.htm

Maybe if we ask him very nicely he will update his site with the availability of the new board and schematic. In all frankness, I'd suggest buying his board since it's his intellectual effort that gives us the design, and he is entitled to a fair compensation.

Anthony, your public is waiting :-)

cyr · 21st May 2004, 07:49 PM

To clarify, I want to use only IRFP260 as output devices. Of course I'll use other active components as well (a single ended class A is not what I had in mind).

Something like holtons n-channel amp is more like it...

azira · 21st May 2004, 08:13 PM

How about a mosfet citation 12? Pretty simple schemtic. Could point-to-point it on veroboard or even make a simple singlelayer PCB for it.
--
Danny

21st May 2004, 03:06 PM	#1
cyr diyAudio Member Join Date: May 2002 Location: Linkoping	Amp using (only) IRFP260 output devices I have a bunch of IRFP260 that I would like to use in a multi-channel amp for a future biamped home theater setup (10+ channels). I would like to use 2 or 4 of the IRFP260 per channel, and use mostly surface mount for the other components to keep it compact. Each channel should be capable of ~100W in 8ohm. So now I'm looking for any schematics or advice to inspire me

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21st May 2004, 03:31 PM	#2
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	Given your constraints you've got one option that I can think of. Build a Zen light with a pretty high bias.. maybe 7A or 8A per channel. That might give you 100W peak into 8-ohms per channel using a single gain device. You might need more bias current still... You can parallel channels at 1/2 bias to help with keeping them from burning out. Really, unless you're planning on adding/allowing more transistors (as in 'P' types or some inverting BJTs for a quasi) you can only make a SE class A... Make sure you have a nice LARGE heatsink... you'll be needing it. -- Danny

21st May 2004, 03:33 PM	#3
slowhands diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Anthony Holton's N-channel amp uses all N-channel devices for outputs. It's in revision, and he has been "on honeymoon", so it has been hard to get the schematic (grrrr...), but here is a pointer to the physical layout of the new revision: http://www.aussieamplifiers.com/New%20N-channel.htm The old version used fewer output devices, depicted here: http://www.aussieamplifiers.com/n-channe.htm Maybe if we ask him very nicely he will update his site with the availability of the new board and schematic. In all frankness, I'd suggest buying his board since it's his intellectual effort that gives us the design, and he is entitled to a fair compensation. Anthony, your public is waiting :-)

21st May 2004, 07:49 PM	#4
cyr diyAudio Member Join Date: May 2002 Location: Linkoping	To clarify, I want to use only IRFP260 as output devices. Of course I'll use other active components as well (a single ended class A is not what I had in mind). Something like holtons n-channel amp is more like it...

21st May 2004, 08:13 PM	#5
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	How about a mosfet citation 12? Pretty simple schemtic. Could point-to-point it on veroboard or even make a simple singlelayer PCB for it. -- Danny

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