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Class D Switching Power Amplifiers and Power D/A conversion

Class D amp in a vintage amp
Class D amp in a vintage amp
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Old 20th March 2013, 05:08 AM   #1
radhaz is offline radhaz  United States
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Join Date: Mar 2013
Default Class D amp in a vintage amp

Hello all, new guy here.

I'm considering putting class d amps in an old integrated amp, removing the boards (preamp, amp, phono, tape head input), just wiring the volume output into the d amp's input. From the looks of the schematic, the volume control is the last thing before the driver section. I would loose the phono preamp and tape head preamp but that can be worked out later.
Has anyone done this type of thing before? I did some searching, but nothing turned up.

thanks in advance.
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Old 20th March 2013, 08:27 AM   #2
norman bates is offline norman bates  United States
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Location: iowa
why not ?

I have a buddy that put a 3110 in a heathkit preamp..........

Looks really nice.

Click the image to open in full size.

might even be for sale....................

another buddy thought of using pass a40 boards as driver boards then buying boat anchor amps.
You have chassis, outputs, transformer, power supply, connectors...............

Make some space, mount the input/driver board, set the voltage for the board, then bias, and voila !!!!!!!!!!!!


Last edited by norman bates; 20th March 2013 at 08:30 AM.
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Old 21st March 2013, 10:15 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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Location: Carlisle, England
I have built a few amps in old amp housings.

I also use desktop PC cases as a basis for an amplifier.
I rip out the SMPS and use the mains socket in the frame.
Also the fan housing come in useful for cooling the amplifier.
PCBCAD51 pcb design software. 2018 version out now. http://www.murtonpikesystems.co.uk
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Old 22nd March 2013, 05:25 AM   #4
radhaz is offline radhaz  United States
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I'm wondering what power supply to get. The amps are 150w IRS2092 IRFB4019. I ordered a 600w +/- 50v toroid, but I think I failed to account for the rectified voltage, which looks like 70v. Maybe I should go with a smps? I would like a low voltage output to add a phono preamp later. The amp can be seen here: IRS2092 IRFB4019 Class D Power Amplifier Board Relay Protection 300W Kit | eBay
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Old 23rd March 2013, 05:54 PM   #5
Bare is offline Bare  Canada
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Join Date: Dec 2001
Location: vancouver
What can I say?
It's a Cheap Chinee PCB amp... likely worth exactly what it costs.
Interpret that in any way you wish :-)
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