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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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3rd November 2009, 09:26 AM
| #1 |
 counter
hi, i have two parts in a circuit if one of the parts sends a pulse the counter should add and if the other part of the circuit sends a pulse the counter should subtract.....also i need to display the final result max upto 99.... please suggest an appropriate counter?? | |
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3rd November 2009, 11:05 AM
| #2 |
| Last edited by Gayan Soyza; 3rd November 2009 at 11:12 AM. | |
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3rd November 2009, 11:11 AM
| #3 |
| up down counter
thank u for such a quick response!!! i have tried reading them but did not understand which to use---will cd4029 work. what i did not understand was whether it will decrease the count if i send a pulse from the second part of the circuit?? | |
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3rd November 2009, 11:35 AM
| #4 |
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Try this. Works for me. No decode chip needed.. | |
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3rd November 2009, 01:34 PM
| #5 |
| up/down counter
hi, thanks for the circuit but we already have a decoder can we do this only using lesser number of resistance and capacitors.. please help!!  | |
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3rd November 2009, 03:21 PM
| #6 | |
| Quote:
Best I can figure is your circuit sends out two different pulses from two different places, and you want one of them to cause a counter to count up, and the other to cause the counter to decrease the count. Therefore, if your pulses are of the correct species, you wouldn't need the first part of the circuit I submitted, only need the second half. (see attached) However, your last post says you already have a decoder, you just lost me right there. I think perhaps your looking for the chip that feeds the decoder, and, to tell ya the truth, that chip you suggest looks good to me, but, I'm certainly no expert....... Have a nice day.... Last edited by Oxbo Rene; 3rd November 2009 at 03:32 PM. | ||
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3rd November 2009, 03:43 PM
| #7 |
 up down counter
thank u for this new circuit!! what i was thinking was that maybe some up/down counter like the cd4029 might do the trick....but i am not sure as to exactly how it works??does it take 2 signals so that we can get output as required?? | |
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3rd November 2009, 04:08 PM
| #8 | |
| Quote:
Looks like it uses one line in but then again, probably another line determines which way it goes. I'm really no expert at this, when I built my counter I stumbled upon my chips and seeing they required no decoder chips I jumped on them. These other chips I have no experience with...... | ||
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3rd November 2009, 04:23 PM
| #9 |
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Take a look at this one, maybe it might help. DM74LS193 74193 Electronics Datasheet Pdf IC-ON-LINE.CN-Free DataSheet Search and Download Site | |
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