This is a useful circuit for Pulse Width Modulation of a load using a standard Remote Control pulse input of between 1 to 2 ms. The circuit can be used as a simple motor speed controller, or to control the brightness of a light, or other loads that need a variable voltage.

The PIC12F683 is ideal for this purpose, because it is a small microcontroller, that has a hardware pulse width modulation channel (HPWM). This means that the PWM signal runs in the background while the microcontroller processes the rest of the code. So the PWM output is not dependent on the length of time it takes to execute a program loop.