Tag changed > Any other ideas? Silicon Chip have done a couple of projects over the years, the most recent major one in 2010 http://www.siliconchip.com.au/Issue/2010/September/Designing+%2526+Installi= ng+A+Hearing+Loop+For+The+Deaf%2C+Pt.1 If you can't find a copy let me know Joe=20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .