MediaBox Blog

Now that we have actually captured an IR signal in Part 1, we will move on to discover why the IR signal was only being captured on the Line-In input, and not on our desired input, CD-In. I mentioned that this could be due to a 1.6Vrms voltage restriction on the CD-In input pins on the ALC883/ALC889a codec on the motherboard. So in this part I will go over a very simple modification to the circuit to restrict the signal voltage to around 1.6Vrms.

I decided not to use a diode as Andrew Zabolotny suggests in his article on the LIRC website and opted to use a potential divider instead. There were two reasons for this is;

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If you have been following the blog then you will already know that I have decided to make my own home-brew receiver to use with the MediaBox. There are various types of receivers that LIRC supports, but the one I have decided to make is a simple IR receiver module (TSOP1736) connected to the CD-In port on the motherboard. The reason I have decided to go with this is due to its simplicity.

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