This circuit was found in a Radio Electronics from 1970. The coupler with LDR is from that time, but the circuit can be adapted to use modern components and act as a shield.
The purpose of this circuit is to convert a short-lived pulse into a negative rectangular pulse. The...
This circuit using current components was found in an old documentation. It is a sequential circuit...
This circuit beeps when the sensor is triggered by the opening of the freezer door or other...