ltkenbo
Junior Member level 1

I have designed the following transformerless power supply (based on many sources around) but I'm not sure how to calculate the proper size of the resistor to limit inrush current. Will a 1W 47 ohm resistor be sufficient? This is the zener diode I want to use:
https://www.mouser.com/Search/ProductDetail.aspx?R=1N5245B-TRvirtualkey61370000virtualkey78-1N5245B
And I want my circuit to be able to supply around 100 mA. Couldn't I use an inductor to limit inrush current instead? Any tips would be appreciated.

https://www.mouser.com/Search/ProductDetail.aspx?R=1N5245B-TRvirtualkey61370000virtualkey78-1N5245B
And I want my circuit to be able to supply around 100 mA. Couldn't I use an inductor to limit inrush current instead? Any tips would be appreciated.
