Found in a Popular Electronics this circuit has double regulation. The integrated circuits used provide a maximum current of 1 A and must be provided with heat sinks.
This circuit of a 1978 American publication monitors a telephone line by triggering a relay. The...
This interesting FET-tester circuit was obtained from an old American documentation. The bipolar...
This old VHF TV booster that also serves FM was found in Radio Electronics magazine from April...