Visitor or Family Member Differentiated Doorbell Circuit

Published:2011/7/14 0:35:00 Author:Joyce | Keyword: Visitor , Family Member , Differentiated Doorbell | From:SeekIC

As shown in the figure is a visitor or family member differentiated doorbell(CD4069、KD9300) circuit, which can tell whether it is a visitor or a family member by hearing the times of the doorbell rings.



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