230v, 50Hz, two wires dimming circuit. Zero cross and phase angle are fine, but when triac is fired, due to missing neutral, and due to mains sine wave chopped by the phase control, then zero crossed is messed and the bulb goes disco blinking. If I power the circuit from separate mains source with neutral, then dimming is just fine. Any ideas how to zero cross detect in a two wire dimming circuit when sine wave is chopped by the triac? Thanks!