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12kHz IF oscillator

2016-08-20 20:07  
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12kHz IF oscillator
The 12kHz oscillator shown as the chart is composed of 12kHz crystal oscillator, output level adjustment circuit, level rising circuit and the alarm circuit. It employs a novel single-tube tuner variable feedback control oscillation circuit, and in the feedback loop, it connects a 12kHz quartz crystal resonator in series, so that the oscillation frequency depends on the the performance of l2kHz quartz crystal resonators. For improving the reliability and output of the oscillator amplitude stability, it uses AC stable exchange rate circuit, in other respects, the circuit uses the devices with high performance and reliability to obtain excellent performance. Technical characteristics: (1) Nominal frequency: 12kHz; (2) Frequency Accuracy: △ f ≤ ± 0.5Hz; (3) Frequency stability: the temperature is 25 ℃ ± 20 ℃ range, △ f ≤ ± lHz ; (4) output level U01: -40.8dB/600Ω, align the scope: ≥ 3.5dB. Level stability △ dB ≤ ± 0.17dB. When the switch S is closed, U01 level enhances l0.5dB; (5) output level U02: +3.5 ± 0.8dB/1.2kΩ; (6) When the oscillator stops oscillation, there is visible alarm signal.