This circuit activates a relay when the supply voltage drops below the value set in the trimpot. The transistors can be the BC548 and BC558 and the 6 V relay. The circuit was found in a 1999 Poptronics.
We find this circuit in an old American manual from the 80's. The circuit has a memory that keeps...
The circuit suggested by National Semiconductor in its 1994 Linear Applications Handbook,...
This simple circuit for switching RF signals was found in an RF Design from the 90s. The circuit...