Using AVR power supply for Class D amplifier

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GeekySimar

Member
Joined 2019
#1
Hi,
I have a non working Yamaha RXV 671 audio video receiver with me. Though its power supply works just fine.

I want to use the power supply of the AVR to power my class D amplifier say TPA7498E or TPA3255.

Is that possible? from service manual I was able to figure out it gives 12V, 5V for some components of AVR out but I am unable to figure out output voltage for Power Amplifier. Is it a overkill for Class D amplifier.

Can someone please guide me on this?

Thanks,
Simar
 
#2
I guess most probably not. Those Hifi Receivers are usually working on a symmetric power-supply unit internally. The 12.5V are most probably only for some infrastructure electronic like control-boards oder DSP boards.
But you have to send us some further photos so that we can better judge.
 
#3
If in doubt, the rating of the big filter caps should give a clue, but given that this is a 105 W / 8 ohm unit, I'd expect the main rails to be +/-55-60 V unloaded or so.

BTW, let me guess: failed HDMI board? Or has a power amp channel called it quits? (Or just a bad standby power supply, a typical Yamaha disease?) I'd be more inclined to be recycling PSU + power amps together... these have notoriously sagging power supplies with all channels loaded so are arguably best used in stereo anyway.
 
#4
sgrossklass said:
If in doubt, the rating of the big filter caps should give a clue, but given that this is a 105 W / 8 ohm unit, I'd expect the main rails to be +/-55-60 V unloaded or so.

BTW, let me guess: failed HDMI board? Or has a power amp channel called it quits? (Or just a bad standby power supply, a typical Yamaha disease?) I'd be more inclined to be recycling PSU + power amps together... these have notoriously sagging power supplies with all channels loaded so are arguably best used in stereo anyway.
Click to expand...


You are right, it has a failed HDMI board. Power amp works just fine. But I want to make a compact size two channel amp for my desktop using a compact size chassis that I have with me.

But I don’t think so I can recycle the parts of AVR to create a 2 channel stereo amp from it.

Or it is possible?

Thanks,
Simar
 
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