Electronic Doorbell & Counter by 4026


Electronic Doorbell & Counter by 4026

Circuit : Andy Collinson
Email: anc@mitedu.freeserve.co.uk

Description:
This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a “ding-dong” chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors.

Source :http://www.mitedu.freeserve.co.uk
/Circuits/Switching/dbcounter.htm
Thank you.


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