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.

Economic Ambulance Siren (CB18011E)
This mini siren, found in a 2003 publication, powers a small piezoelectric transducer, but a...
500M-ohm JFET Amplifier (CB26253E)
This very high input impedance JFET circuit was found in the 1995 Encyclopedia of Electronic...
Fader (CB19811E)
This circuit controls the passage of the signal from one speaker to another. The potentiometers must be of...