TELEPHONE_CALL_RESTRICTOR

Published:2009/6/24 3:34:00 Author:Jessie | From:SeekIC

This circuit is designed to restrict phone calls with the area codes: 900, 976, and 540. This device uses a microcontroller to compare the DTMF decoded tones with telephone numbers stored in EEP-ROM (IC3). This device requires a programmed microcontroller. Software and details of program-ming can be found in the original magazine article.



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