I'm trying to design a phase control circuit which can be controlled by a daqmx card. The daqmx card has a 0-10V output capability. I need someway to control the phase angle of a mains supply voltage (230V AC) using the daqmx card. I have looked at numerous circuits using a basic triac circuits for light dimmers, but I want to be able to control the phase angle (time/degrees within sine wave at which triac fires) using the daqmx card. The major problem is synchronising the mains and the controller of the triac or SSR. Any help would be greatly appreciated.