Many LEDs one resistor

112

01:29:44

Leds with one resistor test

published 9 years ago

Robert_Kidd

9 years ago

You could use just one 5V supply too.

KeiiNDn

9 years ago

Yes, I think equally...

justinmh

9 years ago

While this does work, look at what happens when you have more than one on, they both dim a lot because the one resistor doesn't flow enough current. If you change it to a 150 ohm resistor then it will drive 20 milliamps through one led, and that's the rated current for most LEDs. Now if you power another one they will still dim, so give each led it's on 150 ohm resistor. Also, only need one power supply. Even in real life, a 5 volt 1 amp power supply could drive 50 LEDs, since they only draw 20 milliamps, that's .02 amps. And that's a pretty standard power supply.

justinmh

9 years ago

Even if you lower the resistance so if they were all on it could deliver the current needed to each, that would be 80 milliamps, and p=iv, so .080*5=400 milli watts. Most standard resistors are rated for 1/4 of a watt, or 250 Milli watts, so you would need a higher wattage resistor.

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