70MHz parallel crystal oscillator

Published:2011/4/20 22:47:00 Author:Ecco | Keyword: 70MHz, parallel, crystal oscillator | From:SeekIC

The chart shows 70MHz parallel crystal oscillator circuit. The oscillator is mainlycomposed ofthe transistor VTl, crystal SJT and capacitor Cl, C5 and other components. Selection ofcomponents: capacitors Cl, 20p, C2 to 100p, C3, C7 to 820p, C4 to 56p, C5, C8 to 47p, C6 to 47μF/50V. Inductor Ll is 22μH (color code inductance), 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. Transistor VTl, VT2choose 3DG828, 65 ≤ β ≤ 115. Crystal SJTchooses JA98-70MHz. Relay KM is JUC-1M.



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