Hi All,
Siemens has developed a phase control chip which features a zero voltage crossing unit, own power supply (by connecting to mains), a saw tooth generator and a logic block with direct output to fire a triac. Additionally it has an input to disable triac firing applying ground to it. (to enable firing this input is left floating).
The only place I found this chip available is "abtronics" in Moskow. Their webpage alomost only contains kyrillic letters and ordering from there will of course be problematic.
Anybody who knows another source?
Thanks
Boncuk