Resistors on each led?
I am designing a led array consisting of 17 leds in parallel using 4.5 volt power supply.The led calculator is telling me to use 62 ohm resistor on each - leg of the LEDscould I just use one 62 ohm resistor right after the power supply? Or maybe like 1 or 2 100 ohm resistors?
I'm using blue leds
3.3 max voltage
20 Ma
I'm using blue leds
3.3 max voltage
20 Ma
5
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There should be no problem using one resistor. Just use a resistor big enough to handle the load or it will overheat and burn out, but your leds should be fine.
I don't know why almost all of the diagrams show a resistor for each led except if you're mixing colors of shapes and they take different voltages you can account for that by using a diff. value resistor for each type led.
And should I happen to be wrong on this (but I'm pretty sure I'm not) someone will correct me. Sometimes it's easier to get a correction than an answer.
I don't know why almost all of the diagrams show a resistor for each led except if you're mixing colors of shapes and they take different voltages you can account for that by using a diff. value resistor for each type led.
And should I happen to be wrong on this (but I'm pretty sure I'm not) someone will correct me. Sometimes it's easier to get a correction than an answer.
Jun 29, 2010. 5:56 AMRe-design
says:
You'll have to recalculate the value of the resistor.
Tell me what you get as the value and I'll tell you if I got the same value.
Tell me what you get as the value and I'll tell you if I got the same value.
Jun 29, 2010. 6:41 PMthe_burrito_master (author)
says:
Thanks, I decided to just use 100 ohm resistors in front of each led , they didn't need to be too bright for this project. I'm happy with the result.
Jun 29, 2010. 7:34 PMRe-design
says:
All that matters in the end is that it works and you're happy with the result.
Jun 28, 2010. 4:40 PMiabler124
says:
Try a bread board and use a 225 ohm resistor. That should work. If it doesn't, use that 62 ohm resistor on it but only at our own risk. You might blow your LEDs.
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