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8 ~ 12MHz voltage controlled oscillator circuit diagram with

2016-08-29 03:41  
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8 ~ 12MHz voltage controlled oscillator circuit diagram with stable output amplitude
In the circuit, VT2 controls the collector current of VT1, therefore, the oscillation amplitude of VT1 is very stable. VT4 output signal is converted into a DC signal by VD2 detector, here is the automatic gain controlling state, so that the DC voltage is kept constant. RP1's midpoint voltage is - 0.6V, and the current holding in R1 and R2 is equal, thereby controlling the output amplitude constant value. Oscillation frequency is decided by L1, C2, varactor diode VD1 and distributed capacitor. Uo output voltage is 2V, the frequency is 8 ~ 12MHz signal.