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Circuit Description

Another demonstration of the common seven-segment displays still found on pocket calculators, digital-clocks, and many other devices. Using only seven LEDs per digit, the decimal digits 0..9, the hexadesimal digits A,b,c,d,E,F, and a few other symbols and letters can be displayed.

The applet shows a few hard-wired displays (letters and digits) and a display driven by the TTL-series 7449 seven-segment decoder integrated circuit. For a comparison, see the discrete seven-segment decoder and the SN7449 demo applet.