Alt-BEAM Archive
Message #06846
To: beam@sgiblab.sgi.com
From: Lee Golden leemon1@yahoo.com
Date: Mon, 18 Oct 1999 03:22:22 -0700 (PDT)
Subject: [alt-beam] Re: Stupid mistake
Well, I don't want to be left out of the tragedies!
I sliced the very tip of my right middle finger off
with an X-Acto knife while building a model when I was
six!
I'm more careful now, because Mom isn't around to kiss
the boo-boo any more... :-)
Lee Golden
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6847 Mon, 18 Oct 1999 03:47:56 -0700 (PDT) [alt-beam] Re: Head Questions beam@sgiblab.sgi.com Evan Dudzik
--- Elmo wrote:
> Hi everyone
>
> Elmo the un-knowledgeable here again to rack your
> brains for
> information.
>
> I have a few questions that have popped up whilst i
> have been looking
> into building a head unit.
>
>
>
> 1) Most people seem to be using the
> 74HC240(inverting octal 3 state
> buffer) for their heads rather than the 74HC14(Hex
> inverter with schmitt
> trigger input) which seems to get used a lot more in
> walkers. Is there a
> reason why the HC420 is better for head units than
> the HC14?
>
> 2) Can i build a standard 74HC14 type biocore for
> use in a head unit?
1: its a bicore, not a biocore.
2: an HC14 cannot make a bicore (only two neurons in a
bicore) for some reason, they seem to need to form at
least 3 neurons.
> 3) Why use a biocore at all for this application.
> Wouldn't a simple
> solar engine with phototropic abilities and a
> mechanism for inverting
> the output to the engine so it can go in reverse, be
> sufficient?
yes, but the bicore functions differently here... it
has the ability to turn VERY slow to one side or VERY
fast, depending on the difference in light on each
side. this circuit you proposed would go in putts
that were always the same distance, so it would
continuously overshoot the light unless very lucky,
and when it was locked on to the light, it would still
swing a LOT.
when a bicore is locked on, it just vibrates.
> 4) It's hard to tell from most web pages if head
> units are geared or
> not. Anyone know?
they are geared, regular (non-geared) motors with low
current requirements would not have enough torque.
>
> Thanks again for your help
>
> Elmo
>
>
=====
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6848 Mon, 18 Oct 1999 15:21:39 +0200 [alt-beam] I am a dreamer (WAS: Radio Communications) arno.jansen@superconsult.nl (Arno Jansen) Hmmm, I keep dreaming about communicating scrapbugs. Combining heads with
walkers etc. But I still have to finish my first (*&#$%&* photopopper. No
parts you know...
Well, I am sorry to spoil you bandwidth with this message, but I get quite
frustrated.....>:-(
Best,
Arno
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