7 Segment Display Counter Circuit using IC 555 and CD4033 | Gadgetronicx

7 Segment Display Counter Circuit using IC 555 and CD4033

7-segment-counter-ic-555-cd-4033-circuit
Circuit above  is used to display counts in 7 segment display.Here we are employing two ICs and 7 segment to perform this action. IC1 NE555, IC2 CD 4033 and a seven segment display LT543. 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. Lets move into the working description of this simple counter display circuit.

WORKING OF THE CIRCUIT:
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. The output pulse was then given to the input of the IC CD 4033.

For each pulse the output of the CD 4033 advances by one count. 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 switch S1 was used here to initiate the counting.Diode D1 was used here to prevent the risk of accidental polarity reversal. The given 7 segment display counter circuit can be employed where the process of counting events was needed under controlled environment.

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10 comments:

  1. Yusuf shakirudeen13 April 2014 at 13:10

    the circuit is not working pls wat n want can I do to get it work cos am defending it tomorrow pls u can reach me on aderemiyusuf@yahoo.com pls dear circuittoday

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  2. @Yusuf Ok dude i can help you. But i need to know what problem you are facing in the above circuit?

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  3. @frank donald, I usually see resistors at each leg of the 7 segment display, but there not shown in your diagram. Are they needed here or does the IC handle that?

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    1. Its always safe to use a current limiting resistor and i recommend you to go for 470 ohm resistor above

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  4. @frank, I'm working up a timer using the example you created here: http://www.gadgetronicx.com/2014/05/two-digit-counter-circuit-7segment-ic-4026.html and want to put it in Astable Multivibrator mode, for use as a second timer.. what changes need to be made - also curious about the resistors on the display leads.. thanks for the great work and examples!

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    Replies
    1. Its simple all you have to do is remove the push button and connect the pin 2 to pin 6 of the IC. While working in Astable mode you need to consider the time interval so i suggest you to do with proper calculation. Thank you for the compliment and keep visiting....

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  5. The circuit works beautifully...... effort is much appreciated.

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  6. The circuit is not working properly it shows all the segments on.

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    Replies
    1. Run a check whether you made connections correctly, if you still facing there might be a problem with in Mulvibrator part

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