4511 BCD to 7-segment decoder . Back to Design Electronics Back to Beastie Zone .
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The display shows the decimal numbers 0-9 and is easily understood. There are two important types of 7-segment LED display. In a common cathode display, the cathodes of all the LEDs are joined together and the individual segments are illuminated by HIGH voltages. In a common anode display, the anodes of all the LEDs are joined together and the individual segments are illuminated by connecting to a LOW voltage. The 4511 is designed to drive a common cathode display and won't work with a common anode display.