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This IR remote extender can increase the range of most simple IR remotes (those operating on a 40KHz modulation) a significant distance. In use, the remote is pointed toward the detector on the circuit, and a button is pressed. The Sharp IR detector then decodes the 40KHz modulated signal into a series of pulses, which trigger a 555 timer. The 555 outputs pulses which are re-modulated and used to drive an IR LED. The circuit is excellent for use in a large room like a presentation hall where a typical IR remote is a bit weak. By extending the wires to the output LED (using shielded cable) you can control a device where line of sight isn't available (such as a wall full of TVs in another room).
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|This is an excellent design.It is working very well for me ON MY SET-TOP BOX and TV.
|This circuit works for my DVD player and TV perfectly. But it won't work with a Sky remote. I have confirmed with a scope and Googling that the Sky remote operates with a 36KHz carrier, but even setting this circuit to 36KHz doesn't work. I added a visible LED to show when it's receiving remote commands, and it's receiving them from the Sky remote, but the Sky receiver won't accept what is emitted from this circuit. I don't understand it. Any ideas?
|NE555 datasheet states that the IC can operate at up to 500KHz. Why do you claim it can't operate at 40KHz reliably and advocate use of the CMOS version?
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