Alt-BEAM Archive

Message #12416



To: beam@sgiblab.sgi.com
From: BUDSCOTT@aol.com
Date: Thu, 23 Mar 2000 20:08:10 EST
Subject: [alt-beam] 1381 DLSE


So, i've been looking to power my unicore circuit with this, i've got this
and a ALS245 motor drive to plug this sucka into. Now, 1 farad cap and a 1381
L CMOS, what kinda power out am i gonna get from this, i got this off of

http://www.geocities.com/ResearchTriangle/Node/3904/pictures/ucoba.html

does anybody have any experience whatsoever on this circut? ThAnKs!

-Spencer



12417 Thu, 23 Mar 2000 21:10:08 -0600 [alt-beam] Re: We own Wilf! alt-beam@egroups.com Ben A Micklin Dave,

Don't tempt me even more, I can't take it!

~ben~


On Thu, 23 Mar 2000 19:08:36 -0700 Dave Hrynkiw
writes:
> .... Well, not really (but would like to!).
>
> But Solarbotics _is_ sponsoring his attendance and lecture to the
> BEAM/WCRG
> Millennium Robot Games (http://www.robotgames.com).
>
> Just another reason to come out to the event this summer!
>
> Regards,
> Dave
>
>
> ---------------------------------------------------------------
> "Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_. Yes,
> that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
> 2 vowels. Pronounciation? _SMITH_".
> http://www.solarbotics.com
>
>
------------------------------------------------------------------------
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> Classmates.com has them all. And with 4.4 million alumni already
> registered, there's a good chance you'll find your friends here:
> http://click.egroups.com/1/2622/7/_/5594/_/953864173/
>
> eGroups.com Home: http://www.egroups.com/group/alt-beam/
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>

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12418 Thu, 23 Mar 2000 19:09:03 -0800 [alt-beam] Re: Logic puzzle - I need to built a new gate... :-) "'beam@sgiblab.sgi.com'" Wilf Rigter

In the space of a few minutes I read the puzzle, drew the schematic, posted
it and hit the road and then it dawned on me that I had made a grapho (like
a typo) in the drawing. I arrived home and sent the correction within 10
minutes of my original post but strangely it never arrived on the list. So
here again is the corrected drawing still only 3 components (sorry Ben):

<>
BTW the logic is OUTPUT1 = S1 AND NOT S2 and OUTPUT2 = 0

enjoy

wilf



> -----Original Message-----
> From: Ben Hitchcock [SMTP:beh01@uow.edu.au]
> Sent: Thursday, March 23, 2000 5:39 PM
> To: beam@sgiblab.sgi.com
> Subject: Re: Logic puzzle - I need to built a new gate... :-)
>
> My initial thoughts on this were: Wilf beat me to the best solution again.
> So I plodded through all the possible states, and I think that maybe
> Wilf's circuit might need some modifications...
>
> Let's consider the case of both switches closed. Justin said that when
> both switches were closed, he wanted output 1 to be high.
>
> So to Wilf's diagram:
> Switch 1 will allow current through to the 3904, turning it 'on'.
> Switch 2 will ground the emitter, which because the transistor is on will
> drag the output 1 down to ground.
>
> This results in a closed,closed = low output, which I think should be
> closed,closed = high.
>
> In my circuit I neglected to mention that both switches should be
> connected to Vcc.. details details.
>
> Have I out-designed the almighty Wilf? :-) *hoping but not believing*
>
> Ben
>
> > Three components are needed as shown below:
> >
> > enjoy
> >
> > wilf
> >
> > <>
> > > -----Original Message-----
> > > From: Justin [SMTP:JAF60@student.canterbury.ac.nz]
> > > Sent: Thursday, March 23, 2000 2:04 PM
> > > To: beam@corp.sgi.com
> > > Subject: Logic puzzle - I need to built a new gate... :-)
> > >
> > > Hiya,
> > > For the turning system of a walker I'm designing, I ran into an
> engaging
> > > logic problem that I thought I'd share will you (mainly in the hope
> that
> > > someone could solve it in a more elegant manner than I have :-).
> > >
> > > The problem: (As illustrated below) I have a 4-state truth table and
> > > want to build a circuit to give these outputs at the appropriate
> input.
> > > It's easy if I use an XOR gate, but that would mean adding an entire
> > > extra IC and I'll be trying to build small. My current solution when
> > > freeformed would be slightly smaller than a chip, trouble is, it needs
> > > adjusting when the voltage changes, and the voltage will change a lot
> > > (solar walker) thus ruling out my design. I have no idea what the
> > > circuit for an XOR gate is, and I think that could give someone who
> does
> > > a big advantage.
> > > The outputs are connected to the enable pins of a HC240, so that's the
> > > kind of HIGH/LOW requirements the outputs have to meet.
> > >
> > > If someone could see a way to fix the sensitivity of my circuit, that
> > > would also be great :-)
> > >
> > > Here is the guff: << File: puzzle1.gif >>
>
> [Attachment, skipping...]
>
>
> --
> Nothing is foolproof to a sufficiently talented fool.



Attachment: puzzle.gif

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