| 摘要 |
An electronic control circuit including a sensing circuit for comparing an observed value of electrical resistance to a predetermined threshold value and producing an output signal only when the observed value passes the threshold value; a timing circuit for measuring a predetermined time interval after the production of each such output signal; a feedback circuit for disabling the sensing circuit under control of the timing circuit during the continuance of each such time interval; a triggering flip-flop responsive to each output signal from the sensing circuit for changing its state; and a power switch and solenoid means controlled by the flip-flop for initiating a mechanical operation each time the flip-flop changes its state.
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