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From: John Fields on 7 Mar 2006 12:41 On Tue, 07 Mar 2006 17:08:41 GMT, "John_H" <johnhandwork(a)mail.com> wrote: >Logic design is fun these days. --- _Always_ has been, for me! :-) -- John Fields Professional Circuit Designer
From: Silvester on 8 Mar 2006 09:36 This is something I would like to build. It will not be a timer, it will count objects passing a point. I have several chips on order: 7447, 7448, 74192, etc... I'm looking for something I can work up on a bread board and then possibly put on a small project PC board from Radio Shack. It will eventually go into a paintball marker that has been built to look like the Pulse Rifle from Aliens.
From: Jim Thompson on 8 Mar 2006 09:45 On 8 Mar 2006 06:36:02 -0800, "Silvester" <professor03(a)hotmail.com> wrote: >This is something I would like to build. >It will not be a timer, it will count objects passing a point. > >I have several chips on order: 7447, 7448, 74192, etc... >I'm looking for something I can work up on a bread board and then >possibly put on a small project PC board from Radio Shack. > >It will eventually go into a paintball marker that has been built to >look like the Pulse Rifle from Aliens. First off, join the 21st Century and use 'HC parts ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | It's what you learn, after you know it all, that counts.
From: Ken Smith on 8 Mar 2006 10:08 In article <r9rt02h2ekrua8m6ims64kf8gvfoh8an9j(a)4ax.com>, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >On 8 Mar 2006 06:36:02 -0800, "Silvester" <professor03(a)hotmail.com> >wrote: > >>This is something I would like to build. >>It will not be a timer, it will count objects passing a point. >> >>I have several chips on order: 7447, 7448, 74192, etc... >>I'm looking for something I can work up on a bread board and then >>possibly put on a small project PC board from Radio Shack. >> >>It will eventually go into a paintball marker that has been built to >>look like the Pulse Rifle from Aliens. > >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. -- -- kensmith(a)rahul.net forging knowledge
From: Silvester on 8 Mar 2006 10:09
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). |