This circuit is for traditional old-style telephone lines found in an American 1980s documentation. Components are common and the optical coupler can be replaced with an equivalent.
November 2016 - Mouser Electronics is selling the Terasic Servomotor kit for the control of up to...
This circuit was obtained from American documentation from 1966. It triggers when the two input...
This simple circuit, which requires a low current (50mA) relay for 5 to 12V power supplies, was...