Please I want Know how calculating this circuit?
I don't want just values
I want mode calculate This components.
Thank you

120 & 240Vac LED Voltage Indicator light

http://www.redcircuits.com//Page110.htmhttp://picasaweb.google.com/lh/photo/Lo5o0aEfjLCj_8LvAbQT3w?feat=directlink

 

The circuit is unsafe, and cannot be made safe unless a transformer is used to step down mains power.

We do not support discussion of unsafe circuits on this site. We are very safety conscious.

 

Hello,

As SgtWookie told you, go for a circuit with an isolation by the means of a transformer.

Greetings,
Bertus