If the maximum volume of your smartphones/tablets is not sufficient to drive the passive IR dongle, the layout shown below is very likely a working alternative for DSLR Remote to remotely control your camera via the infrared receiver:
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Mainly it consists of two transistors via resistors connected on one side with opposing polarities to the tip and center ring of a 3.5 mm stereo headphone jack and on the other side with a battery and an infrared LED.
What you need:
- 2 transistors BC 547 C (B type will most likely work, too)
- 4 resistors 330 Ω
- 1 stereo audio jack, 3.5 mm
- 1 infrared LED (940-950 nm, 10-20°) e.g. LD 274-3 or some LED from an old TV remote controls
- 1 lithium button cell (3 V) or 2 alkaline button cells (1.5 V)
- 1 switch
- instant glue
- duct tape or better heat-shrink tubing
- side cutter or equivalent
- soldering iron and solder tin
