Voltage Controlled Oscillator


Posted on Feb 7, 2014

I wish to control a DC motor speed for a 6 volt brush motor through a linear pot and also have that speed oscillate (throb) with the oscillation frequency controlled by a linear pot to have a complete cycle peak to peak of around 1 to 5 seconds. you can see the sine wave controlling the pulse frequency. The pulse frequency can be controlled


 Voltage Controlled Oscillator
Click here to download the full size of the above Circuit.

seperate to the sine wave by a pot while being driven by the sine wave. hope that ain`t confusing :P I have an issue. the circuit I created to produce this frankenstein thingy, roughly works but shifts the width of each pulse MARK relative to the volatge in the sine wave. . and here is the completed circuit and do excuse my layout. I did my best to make it easy to read. I think there is some stuff that is not needed and also think there is stuff I need :P I could not for the life of me use another 555 timer to get the effect I want, that of a shifting pulse frequency relative to a sinewave. So I used an OpAmp. If you have an alternative super simple method to have a pulse frequency shift relative to a sine wave without having the mark of each pulse peak shift it`s width relative to the voltage, I would love some thoughts.




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