This circuit of a 1964 Electronic Design uses a photodiode from the time. Modern equivalent can be used. The standby current is 1.2 mA.
Found in a 1969 British publication, this circuit uses a regenerative switch with two transistors to...
This type of circuit is traditional and has been published several times in different forms and...
This MW radio circuit with varicap tuning was found in an English documentation from 1989. The...