> But, in all honesty I'd recommend getting a DTMF decoder IC. The > only reason to implement this is if cost or space is a really critical > issue. Decoders are not available from digikey or I wouldn't be asking this question. Decoders *WERE* available but are now 'no longer carried' or 'obsolete'. Also space is a *small* issue. Thanks, Andrew > Scott ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: http://dl.www.juno.com/get/tagj.