12kHz IF signal generator circuit diagram

Circuit as shown by the l2kHz the intermediate frequency oscillator, an alarm circuit. It uses variable feedback oscillation circuit, the oscillation frequency is mainly determ

ined by a quartz crystal. Cl, C2 can fine-tune the frequency. Oscillating tube composite pipe to increase input impedance, stable amplitude by VDl, VD2 bidirectional regulator obtained.Specifications: (1) Nominal frequency: 12kHz, the frequency difference does not exceed 1Hz; (2) frequency accuracy: in the temperature range of 25 25, F does not exceed lHz; (3) U01 Output Level: -28dB/600, deviation of less than 0.2dB; (4) U02 Output Level: + 4.5dB 0.5dB.

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