APC TV | Atari Punk Console Oscilloscope
This is an old portable TV that I modified for fun and profit. I installed an Atari Punk Console square wave generator and tied it's output to the TV's horizontal input. The result is a simple oscilloscope style rendering of the wave. It took some tweaking and I learned much to put towards the next attempt.
The CRT and APC have separate power sources so you can use just the synth if you'd like. The CRT uses a 12v adapter (included) and the APC uses a 9v battery (not included).