0-5 VDC control for PWM?

Discussion in 'The Projects Forum' started by Josh Young, Jan 20, 2009.

  1. Josh Young

    Thread Starter New Member

    Jan 16, 2009
    6
    0
    I have gathered the components for a PWM circuit found at this website

    http://www.alt-nrg.org/

    I am planning on building the Constant Current Version 2 schematic.

    I would like to experiment on injecting different things into my engine for increased mileage, and needed an easy way to control the PWM output from 10% to 100% via a 1-4.5 VDC signal from my Throttle Possition Sensor( I looked up the voltage output from my repair manual). Is this possible to do in a simple way?
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Use a comparator IC, feed its inverting input with a triangular wave and on the non-inverting apply the varying DC voltage. As you increase the DC voltage the duty cycle will increase.
     
  3. Josh Young

    Thread Starter New Member

    Jan 16, 2009
    6
    0
    Mik3,

    Thanks for the reply. Sorry it took so long to get back. I do not exactly know how to implement the comparator IC into this particular circuit. Can you point me in the corect direction here? Thanks again,

    Josh
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
Loading...