RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic and the frequency is determined by the crystal.
This circuit must be powered by a symmetrical source and has a very high input impedance. The...
This circuit uses two diodes in a doubling configuration to receive medium-wave range signals. The...
This circuit serves to prevent devices powered by 6 V from being left with a power cut. The...