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Youtuber sycmuzak posted this demo/explanation of his breadboarded sound circuit –

My homemade 555 timer synthesizer. I made it in about 2 hours from 2 555 timers, 4 capacitors, 1 resistor and 3 potentiometers. Schematic can be made available if demand is high enough. This is one of my first 555 timer projects, and I’m a high school sophomore, so feedback is appreciated.

It seems demand was high enough to warrant a schematic posting. Looks like fun –


Collin Cunningham

Collin Cunningham

Born, drew a lot, made video, made music on 4-track, then computer, more songwriting, met future wife, went to art school for video major, made websites, toured in a band, worked as web media tech, discovered electronics, taught myself electronics, blogged about DIY electronics, made web videos about electronics and made music for them … and I still do!

  • TJ Arey

    What are the values for the diodes by the speaker?

    Are they just common switching diodes or do you have something special in mind?

  • Sycmuzak

    Yeah, i have three pots just for more control, take your pick on where to put it. The diodes are un-necessary, i made that schematic on a circuit simulator and it forced me to use diodes, but i didn’t use any in my actual project.

    • Chris

      Nice Job! What are the values of the Potis? 100 Ohm or kOhm? Thanks

  • nicolas gravel

    diodes ARE NECCESARY to stop backcurrents from the inductance of the magnet in the speaker each time you switch the state betwen on and off.
    so, if you want to burn your 555 until a couple of days… use typical diodes. and study something about Lenz current in inductance systems

  • yachris

    But I only see two Potentiometers in the schematic, but he has three in the video…?

  • Jesse

    I think he just replaced one of those resistors in the schematic with another potentiometer.