Apparatus for switching off the radio when the warning sirens sound

摘要

Device for switching off the radio when detecting alarm siren sound consisting of a sensor (1), a low-frequency pre-amplifier with a parallel resonant circuit (2) as a way outlet, power amplifier (3), a switching part (4) characterized in that the siren sound transmitted on the sensor (1) is amplified and filtered in the preamp (2) and then amplified by the power amplifier (3) and used as a signal to the relay in the control section (4) for disconnecting the power supply of the car radio and connecting power supply to the alarm LEDs when hearing the warning siren sound.