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From: firstname.lastname@example.org (Gary Lecomte)
Subject: Re: Roulette Wheel Project
Date: 27 Dec 2002 09:46:49 -0800
NNTP-Posting-Date: 27 Dec 2002 17:46:49 GMT
dansimon@REMOVExmission.com (Daniel Simon) wrote in message news:<email@example.com>...
> On 23 Dec 2002 14:12:55 -0800, firstname.lastname@example.org (Gary
> Lecomte) wrote:
> >Here is another good project for those who are interested.
> >The article is not totally complete yet as I have to reconstruct the
> >documentation. But there are some pictures of my unit that I made
> >about 25 years ago. The Schematic and PCB are also there. Not sure if
> >the schematic is error free, but the PCB has been checked over
> >In the Projects area at:
> >For the most part, the response to my site and the projects I have
> >presented has been great. Hope more people get to enjoy them.
> >I Love to see people doing constructive thing in there spare time!
> >Season Greetings to All of you!
> >All comments appreciated and if you find a page on my site that
> >doesn't work, Please let me know.
> >Take care.....Gary
> Probably ok for 25 years ago. You could do one today with a
> very small cheap microcontroller. You could run all the
> lights with just 7 i/o lines. It would be a lot easier to
> get the microcontroller than all those obsolete cmos logic
> How come there are no current resistors for your LEDs? It
> appears you are relying on the high level output resistance
> of your bcd to decimal decoders to limit the led currents.
> Do the chips get hot?
DAN, If you look closely at my site, it states I'm into "Analogue
This is one of a VERY FEW digital designs that I have ever done, and I
though some readers would appreciate it.
No, the chips don't get hot, NOT EVEN WARM. Only one LED is ever on at
a time, therfore the power dissipation is quite low, even if you run
this at 18 volts.
As to these chips, they not obsloute yet and are all still quite
readily available! My supplier has no problem getting them!
So, Since your into the digital stuff, lets see your design with this
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