Hi all,

I was reverse engineering a DMX light dimmer here and found that it doesn't have an DAC, and a digital signal from an 8051 is aplied trough an 74273 on one led and one MOC 3023 that controls a triac for the AC.
My guess is that it does some kind of duty cycle control to get the light levels and it also controls the light of the led, so I was wondering if someone could give some information on how can this be done.

Thanks already, Gabriel.