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Project Notes

#373 PX835 Audio Effects Chip

Figuring out how to use the PX835 “16 Kind of Sound Doorbell Chip” music chip.


Here’s a quick demo (if you really want one!)..



The PX835 music chip is usually listed as something like “16 Kind of Sound Doorbell Chip Music Voice Module For DIY/Toy”.

I obtained it from a seller on aliexpress, but I can’t find any current listings for the chip.

The chip runs on 3V, and is silent at power-on, and supports two input push-buttons (pull-up to V+):

  • play next/change song
  • repeat last song

It apparently supports a “0.5W to 2W” output. With an 8Ω 0.5W speaker, I got best results with a 47Ω resistor in series.


The sound generated appears to be a PWM tone:


About LEAP#373 AudioMusic Chips
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

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Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.