Found in an American documentation from 1969, this astounding circuitry makes a relay operate on 3 Hz cycles. The relay is of the high voltage type of the time.
Found in a 1964 Electronic Design, this circuit uses transistors from that time. Equivalent...
This circuit allows fluorescent lamps to be powered up to 40 W from 12 V car batteries. The...
This simple signal injector oscillator was found in a 1981 documentation. The coil can be made...