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.
We found this circuit in an English documentation from 1979. It shows how you use a 100 uA...
This circuit was found in an EDN from the 90s. For the components indicated, the frequency is 10 kHz....
This is a very interesting automation that can be adapted for other types of applications. In...