Found in American documentation from the 1990s, this circuit has active cycle control. The basic components are given along with the diagram. Transistors are general purpose.
Found in old documentation, this meter has a high voltage inverter for the Geiger tube. The...
In the figure we have a 100 kHz crystal-controlled oscillator using an operational amplifier....
Found in the November 1974 issue of Radio Electronics magazine, this circuit has a frequency range...