This circuit switches on an external load after a certain interval given by the capacitor. The circuit is from a documentation from the 80s. The load depends on the relay used.
This powerful alarm circuit was found in the July 1975 issue of Radio Electronics magazine. The...
In many applications involving control of circuits from the power grid, the zero-pass detector is a key...
In this circuit the LED remains on after pressing S, for a time that depends on the capacitor...