Jumping Jack Flash weblog

World’s cheapest remote control replicator: just 1$ !

Posted in hardware, Infrarossi by jumpjack on 20 maggio 2008

===>> New updated post

DOWNLOAD Windows software


Android apps:

  1. irplus WAVE https://play.google.com/store/apps/details?id=net.binarymode.android.irpluswave&hl=it
  2. Audio IR https://play.google.com/store/apps/details?id=com.ir_remoter&hl=it
  3. MyRemocon https://play.google.com/store/apps/details?id=com.signzzang.sremoconlite&hl=it
  4. Zaza/il telecomando Tiqiaa https://play.google.com/store/apps/details?id=com.tiqiaa.remote
  5. jackcom – https://play.google.com/store/apps/details?id=com.jakcom.key


External IR blaster devices to fit in 3.5 mm plug:

  1. https://macsources.com/jakcom-i2-universal-remote-control-smart-phones-review/
  2. https://www.amazon.com/Ariic-Remote-Android-Universal-Headphone/dp/B00PBXH9YQ


You won’t need anymore complex circuits & complex software to sample commands from your remote control and to replicate them; all you need is just two standard IR led, which you can afford for about 0.50 $ each, or maybe you can extract from a couple of old remotes.

This method was tested with a VIA AC’97 audio card; please report if you have any success with different cards.

What you need:

– 1 spare headphone cable (0$ if you already have it, 10$ if you need a new one)

– 2 IR led (0$ if you have a couple of old remote controls, 1$ if you need to buy them)

– audio recorder software, e.g. Audacity, opensource and multiplatform (Windows/Linux)

What to do:

1) Build the receiver

2) Sample the remote control

3) Edit the resulting waveforms

4) Build the emitter

5) “Replay” the waveforms:

a – Plug the emitter into HEADPHONE output of your audio card

b – Position the two leds just in front of your device

c – Press PLAY in Audacity: your device should react to the command you previously sampled.


1 – For unknown reason, playing the resulting signal in Audacity works fine to control my device; but if I save the signal into a WAV file and reload it in Audacity, playing it results in… nothing! Any explanation for this?!? FIXED: it was due to wrong carrier frequency of rebuilt signal, which must be HALF of the needed carrier frequency! (19 KHz for 38 KHz, 18 KHz for 36 KHz…)

2 – You can’t save the signal in OGG or MP3 format, because this format distort the original signal

Please report results of your experiments! Good or bad, please just report and share! 😉

References and credits at bottom of this page:
Available patents (not mine):
Infrared generator from audio signal source
IR receiver using IR transmitting diode


Buy a ready-made device: