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arduino - How to detect 220 VAC voltage using an opto-isolator - Electrical Engineering Stack Exchange
![transformer - 220 volt ac to 12 v dc converter without voltage regulator - Electrical Engineering Stack Exchange transformer - 220 volt ac to 12 v dc converter without voltage regulator - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/m9vtk.png)
transformer - 220 volt ac to 12 v dc converter without voltage regulator - Electrical Engineering Stack Exchange
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