Similarly, connect the utility power at AC-IN connector (J1) and intended control device into AC-OUT connector (J2). An indicator (LED1) is provided onboard to test the triac trigger system. This ...

A PIC controls a triac connected across the supply by monitoring power line zero-crossing. The PIC controls dimming by delaying the time the triac fires, which trims the peaks off of the AC waveform.

Green Watt Power’s 20-W GLCT series of constant-current dimmable LED power supplies offer a compact solution for Triac/ELV dimmer-compatible LED driver applications.