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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
The 7490 should not be used for a new design. It is a thoroughly dated part. You should find something similar in the 74HC/HCT series. However:
6 columns or rows of 4 LEDs each to display decades and unit values of hours, minutes and seconds in binary format. It will bend your mind to read the time. Use 6 of the 7490s, daisy-chained and driven by a 1Hz oscillator.
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