would like to get a feedback on a zero cross circuit as it does not work.
Circuit is based on this. 240V AC, 50 Hz
Expect that C2 is 50V. R1,R2, R4 are SMD.
After connecting to mains and measuring voltage across R1, the track between J1(Ac+) and R1 exploded. R1 is alive.
Voltage on C2, R6 and U1 is 100 V
Is this circuit valid ?