This circuit was based on Maxim's MAX4374. The circuit senses the current in a 0 to 20 V line and has a timed output signal, with time given by R1 and C1. Power is supplied with 5V.
This circuit can be used as part of a Vox project or as an input shield for a microcontroller that...
We found this circuit on an Elektor from the 90s. The frequency is given by capacitor C1. The...
Found in Radio Electronics, this circuit is intended to activate the lighting system of garages...