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.

Optical Audio Link Receiver (CB13886E)
27 MHz Transmitter (CB14008E) This circuit was found in a Japanese publication from the 1970s. The...
Modulation Monitor (CB20764E)
This circuit reproduces in a small loudspeaker the sound of the signal that modulates a...
Integrated Astible uA710 (CB19421E)
The integrated circuit used in this multivibrator is no longer common today. With the components...