PURPOSE: To eliminate the need for a manual switching circuit for switching signal passing lines individually and to resolve the trouble of operation by using a changeover switch circuit switching the signal lines automatically by turning on/off a power supply switch.

CONSTITUTION: The changeover switch circuit 4 connects an antenna 2 to an antenna input terminal D, a television receiver 3 to an external television antenna terminal A, an RF converter 9 to a terminal B, a front-end 5 to a terminal E, and a power supply circuit 10 to a terminal F, respectively. When a power supply switch SW is turned on, a voltage is applied to various circuits in the body 1 of FM stereophonic receiver and also to the terminal F of the circuit 4. In this case, a signal applied to the antenna terminal D is applied to the front- end 5. The output of the front-end 5 is applied to an intermediate-frequency amplifier circuit 6 and also an RF converter 9.