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Currently I'm using an IR LED connected directly to a PCB where an Arduino UNO is connected. When I send a command with the Arduino, the LED sends what I want to an IR receiver.

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Now I'm thinking to change a bit this solution, because I want to extend the IR emitter, but not with some loose wires, I want to use a jack 3.5 cable.

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Can I just use a mono cable, connecting the two wires to the PCB, and at the other end connect the male plug to a female 3.5 mono plug, where the LED will be soldered? I don't need to have much power because the emitter and the receiver will be very close to each other.

So, my ultimate doubt is if it'll work with a mono cable or do I need a stereo one?

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    \$\begingroup\$ Hmmm. LED has two wires (anode, cathode), mono cable has two wires (inner + shield), stereo cable has three wires (two inner + shield) so why the doubt about using mono cable? \$\endgroup\$ – JIm Dearden Oct 6 '16 at 10:37
  • \$\begingroup\$ Because all I read on the web about this, a lot of DIY, they all use stereo. I don't get why. \$\endgroup\$ – João Amaro Oct 6 '16 at 10:52
  • \$\begingroup\$ Maybe stereo cables are just more common, or maybe you are confusing a tx with an rx, which usually needs three wires. If you need clarification just add some examples of the DIY tutorials you have found. \$\endgroup\$ – Vladimir Cravero Oct 6 '16 at 11:23
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Yes, you can use a mono cable without any problems. As was mentioned, you only have an anode and cathode which needs to be connected to, so using a stereo one would leave you with an unused terminal.

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