How to Dimension a Power Supply for an Audio Amplifier ? (discuss.tchncs.de)

submitted 1 year ago by megrania@discuss.tchncs.de to c/askelectronics@discuss.tchncs.de

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Hi,

I recently bought a few pre-made amplifier modules for an 8-channel amplifier project (for a sound installation).

The amp is based on the TDA7294 chip and is rated 85W nominal. Now I'm looking for a power supply, but I'm a bit lost (this isn't really my strongest field, to put it mildly).

Do I just need to add up the output power, 8*85W = 680W, or could I get away with using something smaller, like a 300W or 300VA?

Also, the seller said that you need to use CV power supplies, CC won't work and kill the circuit. Does that mean a switching supply can't be used?

It looks like the module has a rectifier and smoothing caps integrated, so I could potentially just use a transformer, right?

Best, N

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[-] ignotum@lemmy.world 2 points 1 year ago

Disclaimer: not at all an expert on this, this is just my thoughts based on what i've heard, please correct me if i'm wrong

Normal power supplies are CV, so you don't have to worry too much about that, CC supplies are a bit more niche
If you want to be able to run the amps at full power, you'll have to add up all their rated powers and find a psu that is rated for that, it could also be wise to go with one slightly larger as well, as power supplies tend to get a bit noisy when they're close to the limit (the voltage they give out gets noisy that is) which reduces the audio quality
what are the input for the amps? You say they have built in rectifiers and everything? Can they be aupplied by mains directly? What is the max input voltage?

[-] megrania@discuss.tchncs.de 1 points 1 year ago

Hmm they are rated for 12V to 32V, and the seller recommends using a toroidal transformer to achieve the symmetric power it needs.

this post was submitted on 25 Oct 2023

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