Posted on Feb 6, 2014

Simple interconnection of RS7490 decade counter RS7447 decoder, and 7-segment digital display for each desired digit makes ideal counter for classroom demonstrations and Sci-ence Fair exhibits, With two additional stages added, display reaches 9999 before recycling. Use 1N914 diode in series with battery to protect against polarity reversal and

Click here to download the full size of the above Circuit.

reduce supply to 5 V for ICs F. M. Mims, "Integrated Circuit Projects, vol. 6, "Radio Shack, Fort Worth, TX, 1977, p53 63.

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