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dart_ace2ace
modified 10 years ago

It worked in reality... Why not here

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4
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01:33:30
Using a led replacement xmas light with 2.5V written on the front of the box, a 9v battery, and a 56 ohm resister at 5% tolerance, i got the light bulb to dimly light up in real life but when i try it here it doesn't work. Can anyone explain what i did wrong in this circuit?
published 10 years ago
user11
10 years ago
first your leds voltage rating needs to be set to 2.5 . Second you're drawing almost 5 times the current that an led is rated for. Third It worked in real life dimly because you were over-juicing the led. If you raised your resistor value to 320 ohms you will get a fully bright led, don't let the led see more than 30ma though because that is usually when the led melts/burns out too quickly. This sim is correct, you will burn that led out in seconds or minutes, I bet it was getting really hot with all that extra current. If you cant find a resistor around 320 ohms then leave the 56 ohm but add three more leds of the same 2.5 rating in series (one negative led to the others positive led wire) Hope that helps!
GusKidJake
10 years ago
You would need a 174 ohm on the led and 167 ohm on the lamp at the minimum most rating if you would want it to run properly. But listen to the post before mine, im still in training! lol
giomix
10 years ago
You have to adjust led or lamp settings, power or current
giomix
10 years ago
Led is current driven dipole, in reality it works from 8 to 25 mA around, depending by color and power. You have to use right resistor to limit to that currwnt

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