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.

Thermometer LM3911 (CB19203E)
The LM3911 from National Semiconductor (Now Texas) is a temperature sensor that provides an output...
Robot Eyes (CB12397E)
Found in a 1990 Electronics Handbook, this circuit causes an LED to flash when the phototransistor receives...
Code Switch (CB11491E)
This circuit was obtained in a Portuguese publication in 1979. It is a simple code switch that...