| 摘要 |
A delay circuit ( 12 ) includes a resistor (R 1 ), a capacitor (C), and a discharging circuit ( 14 ). The discharging circuit includes a PNP transistor (Q 1 ) and an NPN transistor (Q 2 ). The capacitor has one terminal connected to one terminal of the resistor, and the other terminal connected to ground. The PNP transistor has a base connected to the other terminal of the resistor, a collector, and an emitter connected to a voltage source. The NPN transistor has a base connected to the collector of the PNP transistor, an emitter connected to ground, and a collector connected to the one terminal of the resistor.
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