So I built a IR receiver for my MythTV box. The hardware part of the project went pretty well I thought but there was one bump in the road. If you follow the circuit diagram on the LIRC website it won't work well on the CD-in connector. I really wanted to have everything tucked inside the case, and RS-232 ports are becoming the exception. The CD-in connector on the MoBo seemed like a great idea (BTW awesome work by the LIRC audio_alsa driver delevopers). The problem is that the resistors used in the voltage divider on the LIRC website don't provide the best voltage or current for the CD-in connector. However, I did find this guys blog post about using CD-in and his circuit worked like a charge (tho I did add a 100nf cap like the LIRC diagram). Works like a charm now even using the dreaded RS 276-640 IR module. http://www.mediaboxblog.co.uk/blog1.php/2008/05/25/howto-home-brew-ir-receiver-for-lirc-2 Getting the software configured was a little bit harder tho. Largely do to the crap onboard Intel audio card. This required a device setting of "plughw:0,0@8000,l". 2009-05-12T16:03:49-05:00 3 true 2009-05-12T16:07:51-05:00