Password Electronic Doorbell Circuit

Published:2011/7/8 1:43:00 Author:Joyce | Keyword: Password, Electronic , Doorbell | From:SeekIC

The password electronic doorbell is actually one that can tell whether it is a member of family and a visitor .Because a family member knows the password, when he presses the password, the doorbell will give out a kind of music. While a visitor does not know the password, so he presses a pseudo code and the doorbell will give out a specific sound, which enable the host to distinguish family members and visitors .The circuit is as shown in the figure. The circuit is composed by a four-two input Schmitt trigger CD4093 and two sound circuits, of which three doors of CD4093 D1 ~ D3 and buttons SA1 ~ SA3 forming a logic control circuit.



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