Working principle: The 12kHz intermediate frequency oscillator is composed of a 12kHz quartz oscillator, output level adjustment, level boost circuit and alarm circuit. It adopts a novel single-tube tuned variable feedback oscillation circuit. In the feedback loop, a 12kHz quartz crystal resonator is connected in series, so that the oscillation frequency depends on the performance of the 12kHz quartz crystal resonator. In order to improve the reliability of the oscillator and the stability of the output amplitude, an AC amplitude stabilization circuit is used.
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