Devices to generate signals for development, measurement or testing

This generates a wide variety of digital signals. I made it when I was pursuing an experise in digital multiplexing.

Generates signals from  3Hz to 500 KHz. The main output has a gain control, It can be AM or FM modulated and has a variety of waveforms.

There is also a square wave output,

This generates waveforms to test ICs.

It was originally used to show the results on a big color CRT, but that is long gone!