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Description the circuit shown here is of a simple 0 to 9 display that can be employed in a lot of applications the circuit is based on asynchronous decade counter 7490ic2 a 7 segment display d1 and a seven segment decoder driver ic 7446 ic1. The display counts from 0 9 and resets itself to zero before going further let us first discuss about seven segment displays before going further let us first discuss about seven segment displays. Electronics tutorial about the bcd counter circuit and the 4 bit 74ls90 bcd counter which can count from 0 to 9 or cascade together with other bcd counters. It is called a decade counter because it counts up to 10 from output 0 to output 9 4017 decade counter circuit the schematic diagram for the decade counter using the 4017 chip is shown below. Welcome to our site electro tech is an online community with over 170000 members who enjoy talking about and building electronic circuits projects and gadgets