Found in documentation from the 1980s, this highly sensitive circuit is based on the conduction by the presence of gas from an ionization chamber. The components are from the time.
This XR2208 application circuit was found in the April 1978 Radio Electronics magazine. The...
The configuration shown is a flip-flop that can be triggered by means of two push buttons normally...
This random noise or white noise generator was published in Radio Electronics magazine in July...