| 摘要 |
A frequency stable blocking oscillator using a timing capacitor to control the conduction of a transistor amplifier includes a transformer having a primary winding connected to the collector electrode of the transistor and a secondary winding connected between the timing capacitor and the base of the transistor. Upon conduction of the transistor, the voltage induced in the secondary winding is applied to a diode connected to the capacitor to produce a bucking voltage in opposition to and proportional to the magnitude of the DC operating voltage supplied to the oscillator. This bucking voltage establishes the starting charge on the capacitor, with a reduced bucking voltage being applied to the capacitor for a drop in the operating voltage and with an increased bucking voltage being applied to the capacitor when the operating voltage rises, thereby stabilizing the frequency of operation of the oscillator irrespective of variations of the operating or supply voltage.
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