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.

Second Order 1 kHz Low Pass Filter (CB13444E)
This filter was found in a 1975 American technical publication. The filter can be of any type and...
Motor Control (CB24934E)
This motor logic control was found in the September 1985 issue of Radio Electronics magazine. The...
Modulated siren 555 (CB8651E)
This configuration can be found elsewhere on this website and section. The circuit is from Popular...