Electronic Doorbell & Counter by 4026

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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.

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

This entry was posted on Thursday, October 4th, 2007 at 3:20 pm and is filed under Audio - Alarm, Digital, Electronic Control. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.