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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This entry was posted on Thursday, October 4th, 2007 at 3:20 pm and is filed under Audio - Alarm, Digital, Electronic Control.
