Geiger counter with high voltage source (CB22333E)

This circuit includes a high voltage inverter to power a Geiger tube. We found it in an American documentation from the 60s.

Alarm (CB24803E)
This 555 IC circuit was found in June 1984 Radio Electronics magazine. This circuit detects a...
FET and Bipolar Preamplifier (CB13754E)
We found this circuit in a 1976 publication for radio amateurs. It was originally intended for use in...
Integrated Circuit MC1648 Transmitter (CB19456E)
The integrated circuit used in this small transmitter is not very common today. The coil has its...