| 摘要 |
<p>A standard TTL inverter (1) drives a series circuit of an inductor (9) and a capacitor (11). This is fed back through a frequency-control crystal (15). A resistor (19) is also in the feedback circuit, and a resistor 7 bridges the low-current-accepting inverter (1). None of the circuit elements need be of high precision or otherwise expensive.</p> |
