Found in Radio Electronics from the 90s, this circuit is intended for analog TV applications of the time. The transistor used as well as the module are uncommon components today.
This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1...
Found in an old Popular Electronics this circuit can also be adapted to be used as a shield. In...
The circuits below were found in amarican publication of the year 1958. The transistors are...