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 game was found in an old Popular Electronics. The unijunction transistor can be 2N2646. The...
This circuit monitors the current in the loads. The NPN and PNP transistors admit the BC547 and...
We found this digital timer circuit in a 1994 publication. The power is supplied by 12 V, which is the...