| 摘要 |
<p>An electrical sensing circuit whose onlt active components are digital logic gates for measuring the continuity of a second circuit such as a series circuit having a power supply, a lamp, and a switch. The secondary of a transformer is connected in series in the series circuit. A square wave generator is connected through an inverter and a resistor to the primary of the transformer. A second inverter is connected to the transformer primary and to a logic gate, schmitt trigger, or comparator whereby a low voltage level at the comparator is an indication of a continuous series circuit and low to high voltage level transitions are an indication of a discontinuity.</p> |
