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I'm sure I saw a thread on this a while back but I can't find it. Has anyone tried building an IR remote similar to the one in this tutorial (basically two IR LEDs at opposite polarities across a headphone cable)?

I'm planning to have a go at building one, but I'm after a bit of advice from someone whose already done it or who has a better understanding of electronics than me. Is there any reason why this shouldn't work with the Hannspad? Will it have a usable range, and is there anything I can do to improve it (short of building the amplified design from the IRDroid website)? Are some LEDs better than others? I'm planning to buy them from Maplin and they have several that look suitable - order numbers N17BU/YY65V/YH70M/CY85G. Finally, when connecting the LEDs is there an easy way to tell which wire carries the audio signal and which is ground?
 
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