Found in a 300 Circuits from the 90s, this circuit can deliver a maximum current of 50 mA. The output is 20 V with a 12 V input.
This is a simple 1-digit voltmeter circuit using voltage comparators. It was found in a 2004...
This circuit is from old documentation, but the regulator may be 78xx series equivalent and the...
This circuit appeared in the November 1995 issue of Electronics Now magazine. The circuit uses...