use infrared technology to remotely control a CD-ROM drive with an audio CD.
http://www.ee.washington.edu/conselec/A95/projects/mdw/fproj.html
http://home.swipnet.se/perz/te.html
with S-Video, Composite Video, and Audio
http://www.web-ee.com/Schematics/VSwitch/vswitch.htm
measures the relative intensities of different Infra red light sources.
http://www.mitedu.freeserve.co.uk/Circuits/Testgear/irtest.htm
http://www.mitedu.freeserve.co.uk/Circuits/Interface/irlink.htm
wiring IR modules to PC serial port.
http://www.lirc.org/receivers.html
receive signals from a standard Sony remote control and send the code bytes(2) received to an RS-232 port, based on PIC 16C84
http://www.users.bigpond.com/pbhandary/pic/IRSony.html
A MIRT is a device that uses Infra Red technology to trigger Pre-Emptive sensor on a traffic light and causes the light to change to green. Usage of this circuit may not be permitted in your locality.
http://www.i-hacked.com/index.php?option=content&task=view&id=176
http://www.tkk.fi/Misc/Electronics/circuits/ir_send.html