| 摘要 |
PURPOSE:To enable to perform audible alarm for the failure which is hindrance to operation, with a simple constitution, by utilizing the audio amplifier and communication speaker essentially provided with transceivers. CONSTITUTION:When the abnormal voltage at the power supply 2 feeding power to the transmission and reception section 1 is detected with the voltage failure dedetctor 3, the alarm oscillation circuit 4 is operative in response to it. The output is inputted to the audio amplifier 5, to produce alarm tone from the speaker 6. |
