555 Simple Voltage-controlled Oscillator

Published:2011/6/27 4:11:00 Author:Zoey | Keyword: 555 Simple, Voltage-controlled, Oscillator | From:SeekIC

As shown in the picture 3-10, the circuit take the 555 and FET 3DJ6 as its key part to constitute a controllable multi-vibrator. As soon as terminal A and B controlled by voltage Vk, equivalent resistance between drain and source of 3DJ6 will change thereby. So, it causes the frequency change of 555. f=1.44/(R1+2RDS)C1 This circuit can also be applied in various situations such as to transform V/F，or to identify different tones, etc.



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