Sickroom calling device circuit

Published:2011/11/30 21:14:00 Author:May | Keyword: Sickroom calling device | From:SeekIC

This circuit is composed of two ICs, its features are that it can use a pair of wires toreplace the calling wires in ten rooms. Every room number uses LED as indication, when people press calling switch, corresponding LED displaysroom number, and emits voice.



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