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Crystal oscillator Circuit composed of 555

2015-02-03 15:20  
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Crystal oscillator Circuit composed of 555
Crystal oscillator Circuit composed of 555
With the composition of a 555 circuit, a quartz crystal oscillator circuit can be formed. As shown in the figure 3-7, after jointing point A and point B or clamping and jointing a small resistance, an astable multi-vibrator is formed and its oscillation frequency f is 1.44/R1C1. Choose a fixed R1C1 oscillation frequency close to f, and then joint the different parts as shown in the picture, tract the circuit to crystal oscillator or to its oscillator on the harmonic. If it does not starts-up well, we can adjust the variable capacitor. If the time constant is multiplied N times, the oscillator frequency will turn to be 1/N of the crystal oscillator frequency.