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7-Segment LED Counter (binary and base 10) 7-Segment LED Counter (binary and base 10)
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Old 14th September 2008, 11:46 AM   #31
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where is your pulse input to the circuit? also I'll need a zero contact bounce circuit.
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Old 14th September 2008, 09:41 PM   #32
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Can you elaborate on a "zero contact bounce circuit? I haven't seen any mechanical device that would warrant a de-bounce.

-BaC
Just wondering what you meant is all.
Quote:
Originally Posted by hayzee518 View Post
where is your pulse input to the circuit? also I'll need a zero contact bounce circuit.
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Old 15th September 2008, 01:34 AM   #33
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I assembled a small up count circuit with a pushbutton as the input. when you make the contact the counter increments one digit. when you release the button the contacts open and you'll get another unwanted pulse. so for each push of the button you get two digits.
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Old 24th September 2008, 02:51 AM   #34
Default thank u very super
superthank u very super
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Old 24th September 2008, 05:51 PM   #35
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Ahh well a button would be a mechanical device, got you.

-BaC
Quote:
Originally Posted by hayzee518 View Post
I assembled a small up count circuit with a pushbutton as the input. when you make the contact the counter increments one digit. when you release the button the contacts open and you'll get another unwanted pulse. so for each push of the button you get two digits.
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Old 5th October 2008, 01:03 PM   #36
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This is a great circuit, and when taken in depth it can teach someone the basics of Logic circuits and binary
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Old 5th March 2009, 04:03 AM   #37
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Quote:
Originally Posted by Tom McCurdy View Post
Here is something that I was able to build, it basically takes the pulse from a 555 timer and goes through a 7490 divide by 10 into a 7448 and finally into a LN514rk Common Cathode LED-- if you are going to use a common anode LED just replace the 7448 with a 7447

Materials Needed
  • 5 V-Source
    Wires
    555-Integrated Circuit
    7490-Integrated Circuit
    7448-Integrated Circuit
    7-Segment Display (the one I used was LN514RK)

Simply connect it as it is in the diagram
quantumninja.com
hello sir and thank you for the nice, simple and very well written diagram, am just asking, what can i add(or remove) to this circuit to make it only count from 0-4 and can be controlled by 2 manual switches to simply ADD or SUBTRACT a count.

Ive already seen the diagram on how to move the count positively by manual SWITCH but what I'm puzzled about is how I can adapt the circuit to subtract a count and make the whole only from 0 - 4.... thanks a lot and keep posting those cool diagrams
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Old 16th September 2009, 12:49 PM   #38
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hi iam just a newbie i really need to know how to make 3 seven segmen to count off like a stop watch for my project for example 0:09 to 0:10 to 0:11. i know how to display the no. in the seven segment the problem is i cant place the digit ten in the 2nd seven segment and make the 1st seven segmen count off again until it reach to 9 and make another change in the 2nd seven segment again. wil you help me? i really need this and anothe thing this circuit is connected in the computer it must have a parallel port
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Old 24th September 2009, 12:52 PM   #39
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Quote:
Originally Posted by Tom McCurdy View Post
Here is something that I was able to build, it basically takes the pulse from a 555 timer and goes through a 7490 divide by 10 into a 7448 and finally into a LN514rk Common Cathode LED-- if you are going to use a common anode LED just replace the 7448 with a 7447

Materials Needed
  • 5 V-Source
    Wires
    555-Integrated Circuit
    7490-Integrated Circuit
    7448-Integrated Circuit
    7-Segment Display (the one I used was LN514RK)

Simply connect it as it is in the diagram
quantumninja.com
hello sir i'm narendran.i felt appearence of this circuit is poor for me. so kindly request you to send me the the same circuit with good appearence.......to
naren.scorpion08@rediffmail.com
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Old 6th November 2009, 01:26 PM   #40
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Quote:
Originally Posted by mibedo View Post
hi iam just a newbie i really need to know how to make 3 seven segmen to count off like a stop watch for my project for example 0:09 to 0:10 to 0:11. i know how to display the no. in the seven segment the problem is i cant place the digit ten in the 2nd seven segment and make the 1st seven segmen count off again until it reach to 9 and make another change in the 2nd seven segment again. wil you help me? i really need this and anothe thing this circuit is connected in the computer it must have a parallel port
Did you manage to make this thing? If you did, could you share some informations about it...

I would like to do this thing too. 3 seven digits counter, connected to the parallel port, from where this increase signal will come.

Tnx in advance
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Old 12th November 2009, 07:30 PM   #41
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hi..im also new in electronics..can you tell me how to convert 9V to 5V as I only have 9V battery..Thanks.
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7segment, base, binary, counter, led

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