| 摘要 |
A power source device for a portable type radio apparatus having a transmitting circuit wherein the transmitting circuit is connected to the power source through a time constant circuit and a tone signal generating circuit is connected to the time constant circuit through a delay timing circuit. The tone signal generating circuit is operated at a required time before the operation of the transmitting circuit is terminated by the time constant circuit to inform a user of the fact that the transmitting circuit is about to be stopped in operation.
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