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    300kHzsignal generator----- 300khz signal generator

     

    As shown in the figure, it is a 300kHz signal generator. It consists of VT1, T1, VD4, and related components. The voltage-controlled oscillator is tuned by an LC collector, and VTL is a oscillating tube. The inductance constituting a tuning circuit is composed of 1 to 3 windings of the variable diode VD4, the capacitance C3 to C6 and the variable T1, and the volatile diode VD4 is backfaster, from The control voltage is applied to the negative end to change its capacitance. The oscillation signal is output from the 6 to 7 winding of TL. Where C6 is a frequency fine-tuning capacitor. The VD3 stabilizes the oscillation level operating voltage, the stable voltage is 6.8V ± 0.2V. Component selection: Three-pole VT1: 3DG6C, β = 65 ~ 85. Diode VD1, VD2: 2CPL4, VD5: 2CK18. Regulator Diode VD3: 2CWL4. Variable diode VD4: 2cc5. Resistance R1: 3.6K, R2: 3.3K, R3: 5.1K, R4: 510Ω, R5: 3.9K, R6: 3K, R7: 100K, its model is RTX-0.125W. Capacitor CL, C2: 5μF30V, C3: 51PFL00V, C4: 820PFL00V, C5: (optional), C6: 20PF. Variable T1: Model is L22, A = 100. L1-4: φ0.29mm, bypass 27, L2-3: φ0.29mm, from L8, L4-2: φ0.29RAM, bypass 9, L5-8: φ0.29mm, from 7, L6- 7: φ0.29mm, around 6. L1-3 = 292μH, allowed error range: 0 ~ 10μH.

     

     

     

     

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