| 摘要 |
PURPOSE:To prevent viewers from receiving an electric shock even at the time of adjusting a handle for adjusting sound volume at the time of listening to other sound signal by providing a circuit of the sound signal side in a cool chassis and insulating the cool chassis from a hot chassis. CONSTITUTION:At the time of receiving a radio broadcasting, the contact 1a of an input change over switch 1 is connected to a contact 1R. At this time, the contact 28a of a television and radio change over switch 28 is interlocked and connected to a contact 28R. Accordingly, the sound signal from a radio receiver 22 is supplied to a speaker 3 through a photocoupler 23 and the radio broadcasting can be listened to by the speaker 3. The prescribed key of the key device 15 of a microcomputer 14 is operated to adjust the sound volume. At such a time, the receiver 22 is provided in the cool chassis 7 and the chassis 7 is insulated from the hot chassis 6 disposed in a TV circuit to have no fear of receiving the electric shock.
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