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Multiple-frequency Signal Generator Circuit

2014-11-06 15:48  
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Multiple-frequency Signal Generator Circuit
Multiple-frequency Signal Generator Circuit
As shown in the figure is a multi-frequency signal generator. SJT, VT1 constitute a crystal oscillator. Since quartz crystal SJT is used as an equivalent inductance, which has a high equivalent value Q, other components and stray parameters have little effect on the oscillation frequency, therefore it has a stabile frequency. Source follower is composed of VT2 to get lower output impedance and buffering, so as to avoid effect on the stability of crystal caused by loading. In order to obtain more frequency marks to calibrate the receiver, the following square wave circuit can be used.