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woody
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1 Posts
Posted - Dec 23 2007 :  9:44:24 PM  Show Profile  Reply with Quote
Is there a circuit (or premade part) that can be jacked into a home telephone line that will silently monitor the line. If a PIN number is detected, close a low voltage switch, if no PIN number dected, do nothing ???

Aaron Cake
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Canada
6718 Posts
Posted - Dec 28 2007 :  09:44:07 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Probably, yes.

It would be a simple matter of an off-the-shelf DTMF decoder IC, and either a simple microcontroller or an IC like used in this circuit:
http://www.aaroncake.net/circuits/combolock.asp
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