Found in Popular Electronics from the 90s, this circuit aims to drive a solar panel, constantly changing its position to follow the movement of the sun.
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...