Try MX-COM at
http://www.mxcom.com/
Look at the MX-315A, encode only, or MX-465, encode/decode.

On 8 Jun 1998 12:34:21 -0500, you wrote:

->Does anyone know of a single chip solution to add CTCSS encode tones to an
->audio signal?  It would be nice to also have decode but decode is not
->critical for my application.  The tone used must be user selectable.  I
->need it to add this capability to an old radio.
->
->Sorry about the off topic post but thought this group might be able to
->help.  I have surfed the net for a couple of days without little luck.
->
->Thanks,
->
->Norm

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