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Can I use single 24vDC power source to feed two 24v audio amp boards? Answered

I have a audio amp board with no bluetooth so i want to add a bluetooth audio amp board to it all on 24vDC power supply but one board just blips on and off. Thus making a popping sound. Ive tested on separate power sources and seeems fine. Am I wiring wrong?

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Jack A Lopez
Jack A Lopez

2 months ago

Are both of these amplifier boards designed to run from a 24 volts DC supply?

The other thing I am wondering about is, the expected kinds of input and output for each amplifier. Are they both the kind that want line level input (or Bluetooth in one case, which is a digital radio signal of some kind), and do they both produce outputs for driving big speakers? I mean in contrast to the kind of amplifier that produces only line level output, or perhaps has only a headphone jack for its output.

It seems to me, if the amp board with Bluetooth was capable of driving big speakers, then why bother amplifying its output, with another amplifier? I.e why not just use the amp-board-with-Bluetooth alone, to drive your speakers?

Another thing to try is a DC blocking capacitor, between the different ground nodes of these different amplifiers. That is in case these different designs did not put their ground nodes at the same DC voltage. Although I suppose if that difference exists, you could measure it, with a voltmeter. In fact you might have to measure it, if the blocking capacitor is polarized, e.g. like a big electrolytic cap, so you would know which way to insert it, which polarity, for that big capacitor to be biased correctly.

Another possibility, is maybe you need to mess with the amplitude of the signal coming out of the amp-board-with-Bluetooth. I mean, maybe that signal is too big, and you need to run it through an attenuator network, like a voltage divider, or a potentiometer, or something like this, for to make it smaller, before amplifying it again.

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PhatRATTY
PhatRATTY

2 months ago

Learn about amps my dude. Think about a wall outlet. There is only so many extenders you can add to it before all of the plugs dont have enough power. If the 24v dc power supply only supports something like 3 amps and both plugs need 3 amp then each plug will only get 1.5 amp. I would suggest researching the amps needed for all your supplies and then getting a new power supply.