The BA3714F is a signal sensor consisting of a sensor circuit which detects the presence of an input signal, a logic circuit which controls an output drive circuit based on the input signal, and an output drive circuit. The signal sensor circuit employs the dual-wave rectified current method for excellent response. The outputs TE of Pin 3 and TON of Pin 5 can be respectively set by choosing appropriate values for the capacitor between Pin 7 and VCC and the capacitor between Pin 1 and ground. Drive outputs include two systems OUT1 and OUT which are controlled by the logic block. These systems can be combined to enable a wide range of designs. FApplications