Re: Touch Tone Blocking

I need to devise a way to keep users from playing touch tones over the
> paging system. If you can suggest a way to prevent users from
> sounding touch tones over the paging amplifier circuit post it here or > E-mail direct.
Use a DTMF receiver chip to detect the tones. Feed the PA audio input
into the chip and connect the DV output to the PA Mute input.
Probably a $5 investment in parts, or a minimal drain on your junkbox
:-)
You'll still get a brief burst of tone (20-50msec) at the beginning
but the rest of the tone will be muted.
Gordon S. Hlavenka
formatting link
Tragically, as many as 9625 out of every 10,000
individuals may be neurotypical
Reply to
Gordon S. Hlavenka
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