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.

Tone generator for CW (CB23593E)
This oscillator for telegraphy practice was published in Radio Electronics magazine in March 1958....
Musical Organ (CB20744E)
Found in documentation two years 80, this toy instrument uses an integrated circuit little...
Pulse generator 2N2646 (CB23922E)
We found this circuit in a Radio Electronics from July 1968. The circuit generates rectangular pulses...