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.

Vidicon amplifier (CB9411E)
Found in American documentation from the 1970s, this circuit is intended for amplifying analog TV...
Field Strength Aperiodic Meter (CB5190E)
This circuit uses only passive components and the instrument can be a microammeter or the lowest...
Quadrature Oscillator (CB13235E)
This oscillator generates quadrature signals, that is, with a 90-degree lag. The frequency is...