| 摘要 |
An oscillating circuit includes first and second stage amplifiers, a feedback circuit formed of a capacitor and a resistor and connected between the output terminal of the second stage amplifier and the input terminal of the first stage amplifier and a crystal resonator having a predetermined resonance frequency and being connected to the first stage amplifier, the total gain of the oscillating circuit being selected so that the oscillating circuit initiates its oscillation only when the crystal resonator is connected to the first stage amplifier.
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