Password electronic doorbell circuit
Source: InternetPublisher:酷到被通缉 Keywords: Doorbell circuit electronic doorbell BSP switch Updated: 2020/08/11
Shown is the coded electronic doorbell circuit. When installing this circuit, if switches S1~S3 are replaced with three Arabic numerals
, then these three numbers will be the password of the door.
The password electronic doorbell circuit is mainly composed of a trigger circuit and a music generating circuit. The trigger circuit is mainly composed of switches SI~%,
NAND gate integrated circuits and peripheral components; the music generation circuit is mainly composed of integrated circuits IC2, IC3, transistors VT1, vr2, diodes
VDl-*VD3, buzzers and other related elements components.
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