I need calculation of connecting LED Directly to 220V long string!

 

Hello,

Use a wallwart to lower the voltage and then calculate the resistor for the led from the outputr voltage of the wallwart.

Bertus

PS The ToS does not allow leds to be connected directly to the mains

 

Specs of LED? Forward voltage/current rating

 

If you were to try this directly the inline resistor would need to be very high power capacity to dump the waste power and it would be very inefficient. And that's apart from the obvious danger of mains wiring itself.

 

Specs of LED? Forward voltage/current rating

The LED will be 1.9 to 3.5 V RED blue white 20mA 5mm

 

The LED will be 1.9 to 3.5 V RED blue white 20mA 5mm

You say "the" LED then call out 3 colors and a wide Vf range?
Are you just using 1 or 2 or 3 LEDs?
Please post a schematic of how you intend to connect the LEDs?
Are they in a series string? Or 3 in parallel or what?

You must provide this information or we cannot tell you how to size the resistor.

 

I'm surprised this thread hasn't been locked!

 

I'm surprised this thread hasn't been locked!

so am i, usually these things are caught pretty quickly. I only posted to see how far this would go.

 

I'm surprised this thread hasn't been locked!

Sometimes we will try to guide to the right direction as safety method, if the TS insist to do that then the thread will be closed.

 

Hello,

Did you see the first reply?
I mentioned a wallwart over there for isolation.
A phone charger might also work.(5 Volts USB).

Bertus