In the figure we have the way to implement a power zener diode. The voltage depends on the zener, and the maximum current of the transistor.
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...