Application description
Two dimmers are used to control two different incandecent lightbulbs of 240V/100W. While one (white bulb) is fading off, the other (green bulb) is getting more bright.
Input signal to dimmer
dimmer 1 (white) linear dc-voltage ramp from 1 to 9 V between 2 to 20 s
dimmer 2 (green) linear dc-volgage ramp from 9 to 1 V between 2 to 20 s
and vice versa
Problem
Brigthness of bulbs are changing by bounds (fits and starts) even dc-voltage ramp to ANOLOG IN of dimmer and internal ANALOG signal to dimmers PIC16F676 (IC1, pin9) do not show such unlinearities at all.