7-segment display


Posted on Feb 7, 2014

This experiment is more of an introduction to the 4511 decoder/display driver IC than it is a lesson in how to `build up` a digital function from lower-level components. Since 7-segment displays are very common components of digital devices, it is good to be familiar with the `driving` circuits behind them, and the 4511 is a good example of a typi


7-segment display
Click here to download the full size of the above Circuit.

cal driver IC. Its operating principle is to input a four-bit BCD (Binary-Coded Decimal) value, and energize the proper output lines to form the corresponding decimal digit on the 7-segment LED display. The BCD inputs are designated A, B, C, and D in order from least-significant to most-significant. Outputs are labeled a, b, c, d, e, f, and g, each letter corresponding to a standardized segment designation for 7-segment displays. Of course, since each LED segment requires its own dropping resistor, we must use seven 470 © resistors placed in series between the 4511`s output terminals and the corresponding terminals of the display unit. Most 7-segment displays also provide for a decimal point (sometimes two!), a separate LED and terminal designated for its operation. All LEDs inside the display unit are made common to each other on one side, either cathode or anode. The 4511 display driver IC requires a common-cathode 7-segment display unit, and so that is what is used here. After building the circuit and applying power, operate the four switches in a binary counting sequence (0000 to 1111), noting the 7-segment display. A 0000 input should result in a decimal "0" display, a 0001 input should result in a decimal "1" display, and so on through 1001 (decimal "9"). What happens for the binary numbers 1010 (10) through 1111 (15) Read the datasheet on the 4511 IC and see what the manufacturer specifies for operation above an...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    LED Christmas Star
    Boiler control
    Active-limiting-amplifier
    4511B Common-Anode Display Driver Circuit
    Lithium Ion Lithium Poly Charger by LM317
    mpc576h-amplifier-circuit-diagrams.html
    responsive architecture
    Research and Development
    A Regenerative Receiver with AGC for 80 and 40 Meters
    Transformerless 5 Volt Power Supply
    Microcontroller and Motor Driver Circuit Board
    An AVR microcontroller based Ethernet device
    Third harmonic excitation device automatic circuit a thyristor
    Normally closed contact burglar alarm circuit diagram
    Clamp stay current probe compensator



    Top