| 摘要 |
The alarm includes a pulse generator (3) comprising two regulators, an oscillator for generating a pulse with period of 10-second, and a four-bit counter for making 1 loop having 16 steps, a decoder (4) for providing a high level signal at first 6-steps and fitteenth step, a D/A converter (5) for transmitting AC current by applying the output signals of the regulators which transmit high or low level voltage to a transformer according to the level signal and two switching unit operated by frequency generated by an equipped oscillator, a sensor unit (6) comprising a sensor heated by the AC current, and comparator for comparing the output signal of a sensor and a reference voltage.
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