| 摘要 |
In a storage type smoke detector which requires a predetermined time after an ionization smoke sensor detects a fire before a fire warning is issued, a charging circuit including a capacitor connected to a power supplying line is coupled with a discharging circuit for periodically discharging a voltage charged in the capacitor, and the discharging circuit is periodically closed by a P-channel type field effect transistor which is connected to an output end the ionization smoke sensor and which is supplied with a series of oscillating pulse.
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