submitted 1 year ago by MissJinx@lemmy.world to c/askelectronics@discuss.tchncs.de

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Hello! I bought 30 simple UV leds (those with a big and a small leg, not a single strip). I'm trying to build a UV station to dry my resin but idk how to proceed. I tryed watching some videos but there is a lot of math to build that and I can't do it. I have 30 led lights, 5 resistors of 100 and 5 of 300. I wanted to use AA batteries. Do I need 8 of them?? Its not going to be turned on for long, just some 30 seconds at a time.

Can someone help me?

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[-] nothacking@discuss.tchncs.de 3 points 1 year ago

You could connect the LEDs in 5 strings of 6 parallel LEDs, each string with it's own 100 ohm resistor. You will need a significant amount of voltage for that, at lest 7x the threshold voltage of the LEDs

[-] MissJinx@lemmy.world 1 points 1 year ago

Its a 5mm Led

This is the tech info

Do you think 6 AA batteries would hold?

[-] Hagdos@lemmy.world 2 points 1 year ago

AA batteries can supply plenty current, the question is for how long.

You need about 1.3 Watt for 30 LEDs (I'm assuming 15 mA, 3V). A rechargable AA battery has about 2.4 Wh according to Wikipedia, so 6 AA batteries will last you 2.4Wh * 6 / 1.3W = 11 hours.

I have no idea how curing works, but 1.3 Watt feels very low. That amount of power is fine for visual lighting, or for signals (turn on a TV), but energy wise it's very little.

this post was submitted on 03 Oct 2023

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