This circuit was found in a 1967 Japanese documentation. It consists of a touch control system with two transistors from the time. The circuit uses a power source and sensitive relays.
This circuit includes a high voltage inverter to power a Geiger tube. We found it in an American...
This circuit generates a signal up to a few megahertz depending only on the LC resonant circuit...
With the CMOS circuit shown, rectangular signals up to a few megahertz can have their frequency divided...