counter circuit help needed
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From: Silvester on 8 Mar 2006 10:17 >>First off, join the 21st Century and use 'HC parts ;-) >At the suggested speeds, the CD4000 series would be a better option. >You don't need to worry as much about the voltage regulation. What ever it takes... I just need a schematic. Really, I'm not looking to count more than 15 objects per second...
From: Ken Smith on 8 Mar 2006 10:19 In article <1141830557.591676.314030(a)j52g2000cwj.googlegroups.com>, Silvester <professor03(a)hotmail.com> wrote: >Thanks, but I need a display. >Preferably 3 digits using 7-segment LEDs. > >I have a schematic from an OLD Radio Shack book that uses a 555 to >drive a 7490 that dumps into either a 7447 or 7448 and then into a >7-segment LED. I'd like to get THIS to count down and it would be great >if I could get it to use DIP switches to preset a number using binary. > >I'm going to use an IR LED emitter and receiver to count objects >passing a point (piantballs leaving the barrel or hopper). > Check out the 74HC192. It may be the right part for you. -- -- kensmith(a)rahul.net forging knowledge
From: Ken Smith on 8 Mar 2006 10:20 In article <1141831052.926208.121770(a)j33g2000cwa.googlegroups.com>, Silvester <professor03(a)hotmail.com> wrote: >>>First off, join the 21st Century and use 'HC parts ;-) >>At the suggested speeds, the CD4000 series would be a better option. >>You don't need to worry as much about the voltage regulation. > > >What ever it takes... >I just need a schematic. > >Really, I'm not looking to count more than 15 objects per second... Do you want the up-down feature too at this time? It makes a difference in what I'd suggest. -- -- kensmith(a)rahul.net forging knowledge
From: Silvester on 8 Mar 2006 10:41
Counting down is more inportant than presetting the max count. |