DialTone

Dialer for your alarm system it is a 2 board designed circuit with one having the DAA ( Direct Attachment Appliance ) module and the other with the DTMF ( Dial Tone Modulated Frequency )  module.
Board designing image below using Linux program called Fritzing.  Original circuit schematic from BroHogan. Click on image below for larger one.


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phoneBoard03.fzz
(5k)
Stephen P,
12 Nov 2012, 13:27
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