this post was submitted on 20 Jul 2024
9 points (84.6% liked)

diyelectronics

350 readers
1 users here now

founded 2 years ago
MODERATORS
 

I've got the appropriate amount of light for my microscope ring light, but now I need to put it all in an enclosure of some sort.

If I don't have a custom board to solder these to, what are my best options for connecting these she mounting them into something?

If this is too vague, please let me know if I can clarify

you are viewing a single comment's thread
view the rest of the comments
[–] [email protected] 6 points 2 months ago (7 children)

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!

[–] [email protected] 4 points 2 months ago (6 children)

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

[–] [email protected] 4 points 2 months ago (5 children)

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.

[–] [email protected] 1 points 2 months ago

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

load more comments (4 replies)
load more comments (4 replies)
load more comments (4 replies)