The circuit is from a June 1995 Electronics Now. The relay is power-dependent and both R1 and R2 should have close resistances in operation.
Hig stability is the main feature of the 10 V regulator circuit shown in the figure and suggested by...
Found in an Electronic Design from the 90s, this circuit produces a signal whose frequency is...
This didactic circuit from a 1977 Radio Shack documentation shows how to use the 741 as a...