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It's ok to be a beginner, at least you're a smart one, you included everything we need to help you
 Anyways. It really doesn't matter what batteries you use, as long as you get the proper resistor. The only difference between AA and AAA is the size and total amount of energy available. If you're planning on making a headmount, 2AAA's would be good, AA's will last longer, but LED's'll take FOREVER to kill a pair of AAA's. When you recieve your LED's, they'll come with a datasheet. Go Here And set the dials as follows. 3 LEDS Clip or Cap Voltage value (V) | 3 (2 batteries, AA or AAA) Power supply family | Batteries(Obvious) Forward Voltage (V) | (Read the datasheet, the site doesn't tell) Forward Current (mA) | (Again, read datasheet) Once you input those, it'll give you a big chart with a lot of unnecessary info for a beginnner, Here's what you need: (Whoops, calculator refuses to work right now, but if memory serves me right, you need the value that says Resistor value.) Also watch out if it says Series or Parallel, if it says Series, you'll only need one resistor, if it says Par, then you'll need 3(one for each LED) You can use basic 9th grade Science to condense that down to one.(when I was building mine, we were just finishing up our Electricity unit )you can convert it to the resistance for series. PM me if you want to take that route.Anyways, yeah, so Batteries, use either AA or AAA, it doesn't matter. Use the calculator on the site to figure out your resistor, if you don;t use one, the LED'sll burn out, a good sign that they're overheating is that Red LED's are burning orange. |
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ok so after reading a few other topics on this forum i ordered myself a 9v battery snap connector thing, a switch, 5 150ohm resistors and a soldering kit that includes a stand flux tweezers and an angled head. Wil 150 ohm resistors be ok ? in the post I rerad the guy used a 9V battery in series with his IR LEDs which are the same size as mine
Also I just realised in Free Track my webcam is showing a s A logitech Quick Cam express and is only throwing out 15fps  how do i find out the exact model to know if its compatible?If its not compatible will this cam do : http://cgi.ebay.co.uk/10-0M-Pix-Webcam-Camera-8-Leds-Web-cam-Mic-MSN-Skype-UK_W0QQitemZ320244781330QQihZ011QQcategoryZ4616QQssPageNameZWDVWQQrdZ1QQcmdZViewItem |
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If you wire the 2 resistors in parallel, it will give you a resistance of 75 ohm, you're right
 !And according to the calculator, it's gonna be better like that  Anyway, if you want to check if your leds works, look at them through your webcam. Rémy  |
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Back when I still used IR on my old rig(I use plain red LED's now)
the LED's actually glowed a little red, not very bright though. Just look at them through your camera |
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Meh, sry to site owner for image hotlinking, but it's late and I don;t feel like reuploading.
 make it look sorta like that with the 2 r's, but instead of the third in series, just use wire Note that resistors don;t have a Pos/Neg end. |
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