Found in a 73 magazine for radio amateurs of the 1980s, this circuit uses a dual-gate MOSFET. This component is not currently common.
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...