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56 ~ 484 khz high frequency oscillator

2016-08-08 04:56  
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56 ~ 484 khz high frequency oscillator
56 ~ 484 khz high frequency oscillator
High frequency oscillator is shown as the figure, it can be used as special high-frequency generator, selecting different capacitance between 56 ~ 484 kHz can generate a high frequency. The circuit has the advantages of good shave waveform, high stability of frequency, low output impedance. Selection of components: transistor VTl, VT2: 3DG6D, 65 ≤ β 115, VT3, VT4: 3DGl308, 60 ≤ β ≤ 85. Semi-adjustable capacitor C4: CCWX-3-5/20pF. Crystal SJT: BE-42 type. K: JZX-10M (mini relay). Light-emitting diode VD4: BT-605 (red, green color). Variable device T: using MXD-2000 ferrite, GV-30 × 19 core. Ll-2Φ0.21mm high-strength wire with 133-turn winding, L3-4Φ0.21mm high-strength wire with 11 turns, L5-6Φ0.21mm high-strength wire with 80 turns. Nominal power of resistor uses l/2WRJ models and R27, the other type of resistor are 1/8WRJ. Other parameters of marked element are ​​shown as the chart, there’s no special requirement. The relationship between frequency and capacitor values are shown as below.