9 second digital readout countdown timer


Posted on Feb 6, 2014

This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high..


9 second digital readout countdown timer
Click here to download the full size of the above Circuit.




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