The following PWM circuit only need two inverter gates, therefore 3 independent PWM circuit using only one IC can be made. This is because there are at least 6 inverter gates in one IC package.

simple pwm circuit diagram

To stabilize their output to a determined value, any input pin of any unused gates should be connected to ground or to VCC. This would prevent them of swinging to high or to low if the input pins are floating and exposed to noise. This circuit is applicable to control heaters, DC motors, or incandescent lamp.

Share and Enjoy:
  • Digg
  • StumbleUpon
  • del.icio.us
  • Facebook
  • Yahoo! Buzz
  • Twitter
  • LinkedIn