this post was submitted on 20 Jul 2024
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diyelectronics
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I'm no expert, but I think you might need resistors on those LEDs or they'll burn out fairly quickly. I cannot see the whole circuit, and my EE classes were a long-ass time ago. It looks like you might be driving them straight from the breadboard's power. Just wanted to give you a heads up in case it's an issue.
https://electronics.stackexchange.com/questions/28393/why-do-we-need-resistors-in-led
Good luck!
I had that same thought, but I'm running 4, 3.3V diodes per parallel branch/arm/whatever, with a 12V power supply, so the calculations I've seen for determining the appropriate resistor tell me this doesn't need any.
It felt wrong, but I wanted to see if it would light up, and it did! I tried to wrap this concern into the "is it going to start on fire?" Bit lol
Not only you always need at least a resistor, but matching the power supply voltage to the leds drop will ensure you'll have a hard time maintaining their brightness on the real world.
If you want to keep it simple, leave 1V or 2V as a margin and add a resistor to get the desired current. If you want to make it fancy, get a led driver.
That being said, I redid it with your input in mind. It's currently got 100U resistors and draws a good bit more than the power supply is capable of