- Joined Jan 6, 2018
I need a circuit that will make the AC automatically rise slowly when I plug it in the wall (2-3 seconds to maximum) for the primary of my transformer. The primary is the AC wall voltage of 120 volts. With the attached circuit R1 and R2 should be one resistor so I need to know the value of that resistor and the value of the capacitor C1 (can it be polarized?) and what type of DIAC and TRIAC to use.