Found in a 90s Electronic Design this circuit provides an additional 12 V output to a 5 V regulator. The maximum current is 200 mA.
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...