Build an infrared pen

Build an infrared pen

This video is a detailed description of how to make an IR pen. It even shows a diagram and how it works!

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Creator's Site: www.youtube.com/user/ccardew
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+1
ordosingularis 1 year ago
a resistor should be placed in series. Without a resistor, the only limit to the current is the battery's output, which will surely burn out the LED.
+1
shakespeare1212 last month
The LED has some internal resistance and this setup will work fine for quite a while. However, with some LEDs, it would be better to use 2 AA or 2 AAA batteries (a total of 3 volts) and an 18 ohm resistor.
+1
ordosingularis 1 year ago
also, if you use an IR LED and not a visible light LED, you risk SERIOUS injury to your eye.
+1
fdsaf 8 months ago
I think you're talking about UV, or Ultra Violet light.
+1
shakespeare1212 last month
I don't know where you get this from. Your TV remote throws out IR light all of the time. I've never heard of anyone injuring their eyes.
+1
kasted 1 year ago
if you have a hard time making this pen - you can buy one from this site: http://infraredpens.com/
+1
shakespeare1212 last month
You can also buy on ebay, I hear user shakespeare1212 on ebay makes great pens. :-)
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