Hey there guys. I need some help to understand the circuit attached and how it functions. This circuit is a zero-crossing detector and its output is connected to a microcontroller pin (the pin is an input). It takes a 230V ac signal and I assume somehow gives a 5V or a 0v signal when there is a zero crossing or no zero crossing. Can someone please explain how this works and what the output of the circuit will be. Thank you so very much. I am really confused and need some help. The zener diodes used are 5.1V diodes.
mischa
![zero-crossing detector circuit!!!.jpg zero-crossing detector circuit!!!.jpg](https://www.electro-tech-online.com/data/attachments/30/30691-0f2f7656507d232ca78894ed58a1b9d7.jpg)
mischa