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.

Telephone Dialer for Alarm (CB18755E)
This circuit was found in documentation from the 90s. Its purpose is to dial a programmed number...
MP23AB01DH Analog and Digital Audio MEMs Microphone - STMicroelctronics
In the MEMs line of the ST available on Mouser Electronics we highlight the MP23AB01DH audio...
FM to MW Repeater and Converter (CB18656E)
This interesting circuit, found in a 1984 documentation, captures stations in the FM band and...