Hello there, I have an audio amplifier board that I would like to mute and unmute by software. The board has two pins layed out to connect a button, which basically seems to just pull that specific pin to GND. I tried to connect a Seeduino Xiao (pin 3, others also tested) and just do these lines t…

Thank you! I already tried to use a PC817 optocoupler to "shorten" the two mute pins but with no success... [Screenshot 2021-10-19 at 15.32.27] Can you help me what I need to search for to find an example circuit that connects GND to a PIN with a transistor/fet?

can you post photo of the board top and bottom? it is unclear if it is using mute or shut down pin for muting

Okay, I just tried what made the most sense to me and it's working. Thank you! Used a BC547 I had lying around: PIN3 with 10k on Base, Emitter to Xiao GND, Gate to the MUTE pin. Guess that's still not 100% "compliant" but at least it's working for now :slight_smile: Thanks again

Trying to mute an audio amplifier board – working with boards GND but not with boards pin driven LOW

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killzone_kid October 19, 2021, 12:15pm 2

From TPA3118 data sheet

You might want use transistor or mosfet there instead of directly connecting it to the board

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Trying to mute an audio amplifier board – working with boards GND but not with boards pin driven LOW

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