| 摘要 |
A pulsating timer consists of two timers - first one produces repeatedly a short pulse at the end of its timing period, the second one produces a pulse at the end of the desired time period. Pulses from the first timer are fed through a diode and a resistor into a storage capacitor. Since the storage capacitor is charged with current pulses at time intervals as first timer dictates, many pulses are needed to charge it sufficiently to trigger a voltage sensing means. Said resistor, storage capacitor, and voltage sensing means form said second timer which will produce its first pulse after a long time interval and in synchronism with said first timer. Both timers are temperature compensated to assure longer and more accurate time intervals.
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