Component selection: Capacitor Cl is 20p, C2 is 100p, C3 and C7 are 820p, C4 is 56p, C5 and C8 are 47p, and C6 is 47μF/50V. Inductor Ll is 22μH (color code inductor), L2 is 0.3μH. Resistor Rl is 1.6kΩ, R2 is 1kΩ, R3 is 750Ω, R4 is 180Ω, 1W, R5 is 1.3kΩ, R6 is 3kΩ, R7 is 360Ω, R8 is 470Ω, R9~R12 is 300Ω, 2W. Transistors VTl and VT2 are 3DG828, 65≤β≤115. Crystal SJT uses JA98 type-70MHz. Relay KM is JUC-1M. 70MHz parallel crystal oscillator circuit:
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