This is a placeholder topic for “White LED Backlight Module - Large 45mm x 86mm” comments.
Hi, I have several questions about this led backlight. Can it be cut into different size? What is its thockness? Do you offer different colour?
Hi, im making a small diorama that requires 4 led panel lights. I have absolutely no knowledge on electrics atall so I’d love some help with what I need to buy to wire 4 of these up to a battery pack. Thanks!
There are several ways you could put this together. For instance:
2-Way 18650 Battery Holder | Buy in Australia | DFR0969 | Core Electronics
It will take two LiPo batteries and provide a 5V output. The 5V output can be used to drive the 3.3V panels using a series resistor for each. If the supply is 5V, the forward drop of the LED 3.3V, and you want to drive it at the recommended 15mA, then a series resistor of 113 Ohms is recommended. The nearest standard value resistor is 100 Ohms, which would drive the LED at 17mA, still within specs.
To calculate your required resistor:
For a suitable set of resistors:
Resistor Kit - 1/4W (500 total) | Buy in Australia | COM-10969 | Sparkfun | Core Electronics
If you don’t need quite so much capacity, and you already have a recharger for standard cells, this pack would work:
Battery Holder 4xAA with Cover and Switch | Buy in Australia | PRT-12083 | Sparkfun | Core Electronics
with a slightly lower resistor value. Be careful about using a supply much lower than about 5V, as that will require a very low value resistor which will not provide good current regulation for the LED.
That’s great info thnaks!
Hey @Donna301134,
Welcome to the forum!
Just to add to Jeff’s great advice here’s a simple wiring diagram showing how the battery, resistor, and LED connect for each of your 4 panels. Each LED panel gets its own resistor so they all get the right current:
(Repeat this for each panel, all sharing the same battery pack)
If your panels pull about 15 mA each, 4 panels will draw ~60 mA total. With something like a 2000 mAh AA pack, you could expect roughly 30+ hours of run time before needing fresh batteries (less if using rechargeables, which have lower capacity).
For the build, it’s best to mount the resistors close to each LED panel and cover the connections with heat-shrink tubing or hot glue for protection. I’ll admit I struggle to keep wiring neat in my own models/terrain, but I’ve found small cable ties work wonders for tidying things up!
We’d love to see updates as your project comes together! Feel free to post photos or ask more questions along the way. Always happy to help.
And you can get our latest projects and tips straight away by following us on:
