This circuit was found in old American documentation. Transistor is general purpose and coil rated is for 1.5 MHz. Wind 50 + 50 turns of wire 28 onto ferrite rod for 1 MHz.
This circuit uses a sensitive reed relay to control external loads. The time delay is given by the...
This small receiver for the medium wave range was found in a Japanese documentation from 1961. The...
This circuit was found in the April 1968 Radio Electronics magazine. The circuit uses two FETs...