Music Technology
simple DIY 555 synth

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 –

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7 thoughts on “simple DIY 555 synth

  1. What are the values for the diodes by the speaker?

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

  2. 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.

  3. 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

  4. Kool! A DTMF generator! Add a 3×4 grid of buttons and the right resistors and you can use it to dial a phone! Or a 4×4 grid and use it to HACK phonelines!!! (Well not since the ’80s lolz)

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