Infrared (IR) Remote Extender

This circuit can be used to operate a DVR cable box from another room. It’s really an infrared signal repeater. The signal from the remote is received and then retransmitted over wires to an infrared LED. The beam from the LED is then picked up by the receiving window of the cable box.

The visible light LED in series with the IR transmitter is used to indicate that an IR signal has been detected. The 100k potentiometer adjusts the repeater’s sensitivity.

I bread boarded the circuit first to make sure it would work.
I learned that the remote needed to be withing 1 foot of the IR reciever to work.  This was sufficient for my purpose.  If you need greater range, then you’ll need a more complex circuit (see google).

I put the circuit into a case and solder the components onto a small circuit board.
I added a switch and a 9 volt battery.

Here is the completed case.  You can see the hole for the IR receiver on the end of the box.  If you will be using this device in a room with many sources of light, you should put an IR filter in front of your IR receiver.

I concocted this wooden arm to hold the IR transmitter in front of my cable box.


  1. December 14th, 2011 at 07:51 | #1

    Great installation… You have tried to use IR Transmitters for the the functioning of remotes from distant location.

  2. vishrok
    January 25th, 2012 at 15:11 | #2

    Great….. i tried this to but it didn’t work for me, may be the use of Infrared (IR) Receiver Module be a problem instead of Infrared Phototransistor.. it would have been great if had made a video tutorial on it…

  3. January 25th, 2012 at 15:27 | #3

    I have replaced this with an inexpensive IR transmitter from Works great and was only $25.

  4. Mo
    March 15th, 2012 at 18:28 | #4

    Great. Nice and simple going to buy parts and try tomorrow will post if it works

  5. March 15th, 2012 at 19:07 | #5

    It’s a fun electronics project and it works, but it does have very limited range. If you can afford it I recommend the wireless IR repeater from monoprice for $28 or the wired IR repeater for $13. I now have the wireless repeater and it works very well for me.

  6. Mo
    March 17th, 2012 at 20:44 | #6

    So you only connect one side of the battery?

  7. March 17th, 2012 at 22:15 | #7

    The ground symbol at the bottom of the schematic represents the negative side of the battery.

  8. Mo
    March 18th, 2012 at 04:53 | #8

    Oh ok thanks Im new.

  9. Patrick
    July 20th, 2012 at 20:26 | #9

    Do you for see any problems with putting multiple emitters on a selector switch? I have 6 satellite receivers in my bar but there all in the office. And they don’t display the channel number on the front of the box so I have to click the button to change channel for a while then go check the tv or have some one shouting which way to go. So i would have 6 ir emitters on in front of each box and i would be able to select witch emitter with a selector switch that would be located right at the bar

  10. Patrick
    July 20th, 2012 at 20:27 | #10

    *one in front of each box

  11. July 20th, 2012 at 23:21 | #11

    My electronic solution worked but was not perfect. I eventually replaced it with an IR extender from It has been working great and relays the signal through the walls. The one I bought comes with 2 IR emitters (one that looks like the transmitter and one that is a small pod that has double sided tape, so you can stick it on something real close to the receiver for your tv. I would recommend buying 1 and trying it out first. Then you could try a second one and so forth. I hope that helps.

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