DJ Delorie wrote:
Also, I meant to say "alternistor" not alternac. They have better zero-crossing snubbing than a regular triac, but I'll probably switch to a ZC opto for the next board (looking at the Toshiba SMT ones; they're much smaller).
DJ - If you redo the pcb - please consider reworking the physical layout so all the mains stuff is physically separated from the logic-level stuff that people might come into contact with. A mains wire breaking / falling out of the screw terminal and touching control wiring can have interesting consequences.
Adding a few hole pairs in the board to cable tie down the mains wires is also cheap insurance. I don't want to see PCB progress adversely affected here. john