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.

Electronic Potentiometer L149 (CB15137E)
We found this circuit that can control up to 2 A of load with voltages from 0 to 18 V in the...
RF Generator TTL 7400 (CB18965E)
With this circuit it is possible to produce RF signals up to a few tens of megahertz using TTL...
Crowbar SCR Power Supply Protection (CB866E)
Vz determines the trigger point for this protection circuit. The SCR doesn’t need to be mounted on a...