To provide the protection circuit of the solenoid driving circuit of the cassette tape reproducing device with sepecifically has the mechanical automatic program search mechanism for an on-vehicle audio component.

An intermusic detection signal SC, which is outputted from a control circuit and is inputted to the base of an NPN drive transistor Q2 that turns on/off a PNP output transistor Q1, is inputted to a two input NAND circuit through a NOT circuit. Moreover, a V'out, which is obtained by logic level converting the collector output Vout of the transistor Q1 through a resistor R2 and a Zenner diode D1, is inputted to the NAND circuit. Furthermore, an output VL of the NAND circuit is connected to the base of an NPN transistor Q3 inserted in series between a solenoid L and the ground through a resistor R4.