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Can I use an SMPS to power a TDA7293 amplifier?
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    Posted: 08 Nov 2016 at 7:00am

I have been gifted a couple of these TDA7293 Power Amplifier boards(http://www.kynix.com/Detail/839234/TDA7293.html), and I need to give power to them. Description says

*DC power supply: positive and negative 25-45V
*The power of the transformer: 100w-200w

The DIY Audio forums talk about using a huge transformer + rectifier board for these amps. Can I use SMPS instead? The SMPS will be lighter than the transformer.

If SMPS can substitute the transformer, I must use two SMPS and connect back to back or a single SMPS with + and - is available? And is the current rating different for SMPS or same as transformer? Thank you.




Edited by bubu - 08 Nov 2016 at 7:06am
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Points: 16298 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 2016 at 4:29pm
Power Pax SW4590 does 30V at 120W, and obviously you need two. The negative rail of the positive power supply would have to be connected to the positive rail of the negative power supply, and you'd have to ensure both power supplies switched on at the same time.

It is possible that on-load (music playing) one of the power supplies could "stall", so you should ensure no signal at switch on.

Disclaimer: obviously the above is just my suggestion and I can give no guarantee as to how this will perform, and I cannot accept any responsibility for it failing and damaging the amplifiers.
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