| 摘要 |
PURPOSE:To realize the control of sound volume and to improve the operability for a radio receiver which is used for the radio information of disaster prevention, by making use of the voltage that is induced with touch of fingers to a volume knob, a part of a casing, etc. CONSTITUTION:A storing circuit 12 is set by a forcible sound volume signal, and a speaker 4 delivers a sound with the maximum level of sound volume. Under such conditions, the commercial power supply induced voltage is obtained with touch of fingers to a sensor part 16. This induced voltage is detected at an amplifying/wave detecting part 14. Then the circuit 12 is reset, and the ringing of the maximum sound volume is released. |
