We found this circuit with the LM3914 IC in a Radio Electronics magazine from June 1985. The circuit is intended for monitoring the battery voltage through an LED bar.
Connected to the output of a small amplifier or receiver, this circuit triggers a relay in the...
This oscillator version is from an RCA documentation from the 1970s. Transistors support modern...
We found this circuit in an American documentation of the 80's, being indicated for the test of...