DIY Eurorack Synth Stuff

Thomas Henry 555 VCO

The famous VCO module by Thomas Henry based on the 555 timer IC. This was the first module I ever designed a PCB for, which, in hindsight, was not the smartest move. It took me quit a while to get it bug-free, but now that it works, I love it! Over the years I read a lot of articles and booklets by Thomas Henry and if you’re into this synth diy stuff, I highly recommend checking out him and his work. If you want to build/buy one yourself, there is also an excellent version out there by a guy named Fonitronik, there is a link below.

The audio samples are straight from the 555 VCO, CV signal is coming from a S&H module.

Images

Links

https://sdiy.info/wiki/Thomas_Henry_555_VCO
https://www.electro-music.com/forum/topic-54623.html
https://www.modulargrid.net/e/fonitronik-thomas-henry-s-555-vco

Schematics

https://github.com/gerb-ster/TH-555-VCO

Sound Samples