White Leds
White Leds
I want to wire and Power White LEDs for a replica scoreboard?
I have a new baby on the way (my first boy), and I finally get to do a baseball theme nursery. I am building a replica scoreboard to go in the nursery and would like to use LEDs to light it (score, inning, count, etc.) The face of the scoreboard will be made from painted plywood and i will drill holes to fit the LEDs. My questions are: is there a better way to mount them than I described, how to wire them and power them, and is there an easy way to use an AC source rather than a battery? I am no electronics genius, but can figure most things out with a little direction. I just have know idea the type of resistance needed or how to calculate it, can I run all of the LEDs in one series, etc. Any help or guidance would be appreciated.
My second goal (if I ever figure the first one out) will be to have a section of the LEDs function as a clock. I seem to remember one of those kids science projects you buy at the hobby shop doing some thing like that. Any ideas here would help also.
In practice, plastic like plexiglass or an ABS sheet would be better than wood. But that is a matter of personal experience and preference. You may be more comfortable with wood.
That mounting is fine. Hot melt glue on the back side is good way to hold them in place.
You need DC. So you can use any AC to DC adaptor. Pick one up at radio shack or your local electronics store. Given that you will be running a lot of diodes you’ll want one that has as high a voltage and current rating as you can get.
You’re going to run a bunch of branches in parallel and each branch will have several LEDs and 1 resistor in series. Each LED has an Anode which is usually the longer leg and a cathode which usually has a flat side on the case. the + voltage has to go to the anode. The cathode will go to the anode of the next LED or to the resistor which will then go to ground.
Consider one branch; white LEDs drop about 3v and draw about 25milliamps. So if you have a 24v supply you could run 6 or 7 in series in one branch. That would eat up 18~21 volts or so of your 24v. The remaining voltage is going to be dropped over a limiting resistor. You need that to control the current flow through the branch. If the remaining voltage is say 5v, then you would use a 200ohm resistor (resistance = voltage / current = 5v / 0.025A). The power rating for the resistor needs to be bigger than voltage times current, >5*0.025, > .125w, >1/8Watt.
Now consider the many branches together. If you’ve aimed for 25mA each then multiply the number of branches by .025A and compare that to the amp rating of the power supply you bought. That will give you an idea of the number of branches you can run.
In practice you’ll find that some branches aren’t as bright as others so you’ll want to vary the resistance. and some LEDs will be brighter than others. matching them would be called intensity matching and is a pain unless you can buy them pre-matched. I would suggest just living with it.
Hope that gives you all you need. Email if you need more. Good luck.
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