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Simple voltage control oscillator circuit

2016-08-02 23:22  
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Simple voltage control oscillator circuit
As the figure shows, the circuit uses the 555 and the MOSFET 3DJ6 as the core to form the controllable multivibrator. When you add the control voltage VK to the A and B ends, the 3DJ6's equivalent resistance RDS between the drain port and the source port will change, so the oscillation frequency of 555 changes too. And this circuit can be used in the applications of V/F conversion and tone recognition.