Thank you. I completed a PCB. It did not work at first so i did the easy thing and replaced the IC with one from a different batch. That fixed it, HOWEVER... I decided to check another from the 1st batch and that also did not work. Swapped it back with the previous and WTH! that IC no longer worked. So I had one more IC from the 2nd batch and its running now but what happened?
When I say did not work:
When powered up it engaged the relay. adjustments , light, dark had no effect on the circuit.
Top IC is from my older batch
View attachment 142068