Here we design a simple display decoder circuit using logic gates.Įven though commercial BCD to 7 segment decoders are available, designing a display decoder using logic gates may prove to be beneficial from economical as well as knowledge point of view.īack to top Principle of Display Decoder Circuit It generally has 4 input lines and 7 output lines. Mostly these displays are driven by the output stages of digital ICs (to which the visual indication of the output stages has to be performed) such as latches and decade counters, etc.īut these outputs are in the form of 4-bit binary coded decimal (BCD), and not suitable for directly driving the seven-segment displays.Ī display decoder is used to convert a BCD or a binary code into a 7 segment code. However to display the characters and numbers (in order to produce the decimal readout), seven-segment displays are most commonly used. Generally, LCD and LED segments provide the display output of numerical numbers and characters. Most often seven-segment displays are used to display the digits in digital watches, calculators, clocks, measuring instruments and digital counters, etc. Applications of Display Decoder Circuit.7 Segment Display Decoder Circuit Design.The given 7 segment display counter circuit can be employed where the process of counting events was needed under controlled environment. The switch S1 was used here to initiate the counting.Diode D1 was used here to prevent the risk of accidental polarity reversal.

The output of the IC2 in the circuit was wired to the 7 segment a,b,c.g as shown in the figure.Then the pulse from the decoder lights up the seven segment on a sequence there by working as a counter display. The output pulse was then given to the input of the IC CD 4033.įor each pulse the output of the CD 4033 advances by one count. Here NE 555 was wired as Astable Multivibrator which is capable of generating a square wave the period of the square wave was determined by means of external component RC connected to IC 555.The Astable Multivibrator does not require any external trigger, it is capable of generating continuous square wave pulses. Lets move into the working description of this simple counter display circuit. As we know IC 555 is a timer IC and CD 4033 is a simple decoder IC which is commonly used to drive 7 segment displays. IC1 NE555, IC2 CD 4033 and a seven segment display LT543. Circuit above is used to display counts in 7 segment display.Here we are employing two ICs and 7 segment to perform this action.

Multisim 7 segment display part number