Hello, In regard to the RS-232 Laser Transceiver: I plan to use one of the small (toy like) laser pointers that are available that run on 2 or 3 button style (LR44) batteries. Will I need to make any modifications to utilize this type of pointer? Also, can someone please give me some examples of TTL type signals that would be useful? I have an idea of what TTL signals are, but which ones actually are... I would definitely like to use this type of circuit for audio applications. Would I need to make any mods for use with a S/PDIF data stream? This project would be great for sending digital audio signals from one end to another in a crowded bar! No wires for anyone to trip over!! Of course, if there are any other audio applications for this circuit, I would be very much interested!! Any ideas/suggestions/help would be appreciated. Thanks in advance!! Rick414r P.S. I would also like to know where I can find the software for the laser project. The link in the article send me to one for an IR project.