Shown for the 300kHz signal generator. It consists VT1, T1, VD4 composition VCO and associated components. VCO using LC tuned collector, VTl the oscillating tube, varactor diode VD4, T1 1-3 inductive winding capacitance C3 ~ C6 and variable tuning circuit
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composed varactor VD4 anti-bias work from a negative voltage is applied to the control terminal, to change its capacitance. An oscillation signal output from the winding Tl 6-7. Wherein, C6 is the frequency tuning capacitor. VD3 stable oscillator stage operating voltage, stable voltage of 6.8V 0.2V.Component selection: Transistor VT1: 3DG6C, = 65 ~ 85. Diodes VD1, VD2: 2CPl4, VD5: 2CK18. Zener diode VD3: 2CWl4. Variable capacitance diode VD4: 2CC5. Resistance R1: 3.6k, R2: 3.3k, R3: 5.1k, R4: 510, R5: 3.9k, R6: 3k, R7: 100k, which models are RTX-0.125W. Capacitors Cl, C2: 5 F30V, C3: 51pFl00V, C4: 820pFl00V, when commissioning C5 :( optional), C6: 20pF. Variable filter T1: Model L22, A = 100. L1-4: µ0.29mm, around the 27-turn, L2-3: µ0.29mm, turns around l8, L4-2: µ0.29ram, around 9 turns, L5-8: µ0.29mm, around 7 turns, L6- 7: µO. 29mm, about 6 turns. L1-3 = 292 H, tolerance range: 0 ~ 10 H.
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