The Dubknub was my first attempt at building something ‘musical’. Very crude!
All it is is an LM555 timer chip configured to oscillate a square wave in the audio frequencies, with another switchable modulating timer (again square wave). Using the LM556 saves some space as it’s a dual 555.
Here is what I mean:
This things’ output is stupendously high and it’s built into a pencil case!
I built another one for the EASY RIDER Crew, but I don’t think they used it much.. 🙂
Here it is in all its sonic glory!