| 摘要 |
<p>A positive voltage supply (11, 12) is connected to a circuit having a single capacitor (14) and a depletiontype field-effect transistor (20) to create a simple and reliable timer (10). The capacitor is initially charged upon the opening of a control switch (30) without creating a timed output across the drain-source terminals (21, 22) of the field-effect transistor (20). The closing of the control switch (30) reverses the bias of the single capacitor (14) to the gate-source connections (23-22) of the field-effect transistor (20) to thereby create a fixed and reliable timed interval.</p> |
