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up/down counter circuit

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by hafi2_07, Dec 15, 2007.

  1. hafi2_07

    hafi2_07 New Member

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    ir tranceiver

    hi...i need some explanation from u guys....i have attached the figure...i want to know how this circuits is working

    p/s: sorry to reply at this thread...want to open new one...but i cannot open....
    [​IMG]
     
  2. hutas832

    hutas832 New Member

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    is it possible for this circuit to count up and count down depending on a varying frequency.. like when frequency increases the count increases n when it decreases the count decreases???
     
  3. colin55

    colin55 Well-Known Member

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    Eventually you will want to something special with the counter, such as ring a bell when it reaches 31, display letters, flash when it reaches zero or turn off when not used for 20 seconds.

    The best thing to do is use a PIC chip such as PIC16F628A. There are lots of information on the web about this microcontroller and I have a number of counting programs that will do all sorts of interesting things.
    You just need a single chip, a few transistors and resistors as well as 7-segment displays.

    Colin Mitchell
    TALKING ELECTRONICS.com
    talking@tpg.com.au
     
  4. dave

    Dave New Member

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  5. shaizi

    shaizi New Member

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    hi..i'm working with the counter project now..i'd like to design counter circuit with number 0-9....the circuit must have up switch and down switch...
     
  6. mishalkhalid

    mishalkhalid New Member

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    counters

    hi,
    i m working with counters i wana to display from 000 to 999. i used 74LS193 counter with accurate
    datasheet once it counted but never again:confused: i replaed many ICs but all in vein..........
    any suggestion? or any circuit diagram? n how connect 3 seven segment display? circuit diagram???????????????
     
    Last edited: Jun 10, 2010
  7. mishalkhalid

    mishalkhalid New Member

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    hi,
    retiredHAl
    would u like to tell me about counters?????? i've some difficulties
     
  8. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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  9. maxll

    maxll New Member

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    help me

    hi..i'm also working with the counter project now..i'd like to design up/down counter circuit with number 0-99....the circuit must have up switch and down switch...

    but now i'm using 74LS190 with 7 segment display.. the problem is what is the output should be? i mean the output current or the output voltage? should i add some resister or capacitor so that it would not damage any of my component?

    Thank you very much..
     
  10. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    hi,
    Look at this link
    http://www.electro-tech-online.com/...asic-3-digit-led-decade-up-down-counter1.html

    Do you have a circuit diagram you could post so that we can see what your problem is.??
    With a 74LS190 U/D counter you also require a 74LS47 , BCD to 7 segment decoder to drive a 7 seg LED.
     
  11. ben7

    ben7 Member

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    I do not answer to these questions because there is already circuits that are posted on this topic.:mad::mad::mad:
     

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