Hi, I want to build a FM radio squelch using a microprocessor with an ADC. The ADC will be sampling the FM radio audio output and turn on a LED when there is only noise present. The LED will be off when someone is using the channel (no noise, just voice). What is the best way of doing this in software? Thanks for any idea. Mark Jordan --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .