How to vary supply voltage with the help of sensors?

Question

Kindly pay attention to this!

I have a project in which I want the DC supply voltage to increase and decrease as per the speed.

I want the voltage to increase when rpm(speed of rotating object) increases and vice-versa.

Answer 1

Depends on the sensor and the voltage and current.

You can pipe the sensor into an opamp to get a larger voltage, say 0 to 20 volts. Exactly how depends on the sensor. You can run that into an emitter follower power transistor to set the supply output, at the emitter of the transistor.