Completed: January 2011 Last Known Location: Saulces-Monclin, France
This is based on the stepped tone generator by Forest Mims, also known as the atari punk console.
You have controls for frequency and pulse length with a pair of old chrome knobs, as well as a toggle on/off, and a led power indicator.
It runs off an outboard 9v battery. A standard 1/4″ output.