Do it Yourself - IR Transmitter

Step by Step instructions

Parts list include:
  • 2 each 940nm LEDs
  • 3.5mm / 1/8inch male stereo connector
  • Heat-shrink tubing
Tools:
  • Soldering iron & Solder
  • Wire cutters & strippers
Skills required:
  • Soldering, wire stripping and patience.
Part availability:
  • Local electronics stores such as Radio Shack carry these common components.
Assembly Instructions

1. Strip ends of wire as shown below. Some stereo connectors may use two sets of 2 wires per channel in which case the ground wires from each should be connected together and soldered.
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2. The ground wire can be removed. Next we slip a length of heat-shrink tubing over the wire for use at the last step.
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3. Notice the LEDs have unequal length leads. This difference indicates polarity of the LED. We want to join the two LEDs together connecting the long lead to the short lead.
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4. Solder the 2 LEDs together. Notice the LEDs are joined connecting differing length leads to each other.
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5. Slip one piece of short heat-shrink tubing over the LED and using heat from either the soldering iron or heat gun to shrink the tubing. Slide a second piece of tubing over the first for use later. Solder one lead of the stereo wire to one lead of the LEDs. Polarity is not an issue here.
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6. Slide the second piece of tubing over the solder joint and shrink it into place.
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7. Repeat steps 5 & 6 on the second set of LED leads.
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8. The assembly should look like the image below. The next step is to slide the last heat-shrink tube from step 2 into place and shrink it.
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9. The final assembly should look like this. The next and final step is to test it.
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10. An alternative would be to use a stereo plug without a cable. This type of connector may interfere with iPhone cases so be sure to test that the connector inserts fully into the iPhone.
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