12kHz signal generator

Published:2011/4/20 4:28:00 Author:Ecco | Keyword: 12kHz, signal , generator | From:SeekIC

The 12kHz signal generator is shown as the chart, it is composed of the crystal oscillator and the alarm circuit. Oscillator output amplitude is stable, changing <± 0.26dB. Selection components: transistor VTl, VT3: 9014,65 ≤ β ≤ 115; VT2, VT4: 3DGl308, 60 ≤ β ≤ 85. Thermistor RT: RRWl-2 type. Crystal SJT: BE42-12kHz. The transformer T uses MXD-2000 ferrite, the core is GV36X22, Ll-2 uses Φ0.17mm high-strength wire with 57 turns, L3-4 uses Φ0.17mm high-strength wire with 37 turns. Models of light-emitting diode VD3 is not limited. Nominal power of resistor selects 1/8W metal film resistors. Other component values are ​​shown in Figure, there's no special requirements.



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