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.
We found this circuit in an integrated circuit cookbook from 1974. The circuit can provide larger...
This circuit was fond in an old publication of the years 1950. The transistors are germanium types and...
This circuit is from the 1990 Motorola Linear Databook. The circuit can be implemented with other...