Found in a Popular Electronics from the 90s, this circuit can be used as an electrifier. T1 can be an old TV fly back transformer or an ignition coil.
This circuit consists of a simplified Hartley oscillator that changes the frequency according to...
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...
This linear characteristic circuit is based on a junction field effect transistor. The FI and BFO...