Alt-BEAM Archive
Message #12253
To: beam@sgiblab.sgi.com
From: Meabadboy@aol.com
Date: Mon, 20 Mar 2000 23:16:49 EST
Subject: [alt-beam] Re: Aesthetics............
In a message dated 3/20/2000 6:15:35 PM Eastern Standard Time,
sathe_dilip@bah.com writes:
<< Flexible PCB material is available. You may have seen pieces of this
wrapped around in cameras. >>
I found this site today ` was courious myself on this material
http://www.kapton-dupont.com/elapp.htm
and these people also make flexable PCB's with this
http://flexcircuits.com/special.htm
happy surfin
Steve
12254 Mon, 20 Mar 2000 22:12:32 -0600 [alt-beam] Re: Aesthetics beam@sgiblab.sgi.com CORBIT GIBERSON
Justin wrote:
>
> First off, I'd have to say that I'm thinking gold/copper/silver-leafing
> is the way to go. Check out a good handcraft store - there is a huge
> range of leafing stuff availible. It's cheap, quick, and (reasonably)
> easy. If you take the time to experiment, you can probably also get it
> to work on designs fresh out of an inkjet - that would _rock_ and I'm
> definitely going to look into it :-)
Idea!! Fill an inkjet cartrage with some kind of adhesive, print your
circuit, add foil( while it is still sticky), wait till its dry, remove
excess foil, and have some fun with a flexi-bot!
12255 Mon, 20 Mar 2000 22:28:58 -0600 [alt-beam] Re: pleze reed: ....yet again..... beam@sgiblab.sgi.com SG ALSO VERY IMPORTANT>>>
(this is the 240 uCORE i've been talking about in dark smoke filled rooms)
there are TWo different schems of this circuit, the diodes are the WRONG
direction on one, and wilf corrected the mistake...
i'm not sure which way is right...
(already dismantled my old breadborded version)
-Sparky
At 06:29 PM 3/20/00 -0800, you wrote:
>"Scolman,Jim" wrote:
>>
>> ... in the enclosed diagram, one of the power leads goes to the
>> (+ plus) sign, where does the other go? ... where is the (- neg)
>> symbol?
>
>On the '240 chip, pin 10 is negative, or ground (Wilf used a little
>downward pointing triangle). Pin 1 (labelled 1G) and Pin 19 (labelled
>2G) are the two "enable" pins are connected to ground as well; this
>basically turns the two halves of the chip "on".
>
>> Is this a Bicore, MicroCore, or UniCore?
>
>Microcore. This is typical Wilf :) The microcore couldn't be built on a
>'240 chip, it needed a Schmitt inverters; then Wilf came up with this
>circuit to prove the experts wrong. Here's his quote from the original
>message that accompanied this circuit:
>
> "Here is a tested 74HC240 microcore (no not a bicore)
> circuit which behaves just like a 74HC14 type microcore
> and motor driver combined."
>
>> ... All the "stuff" inside the outline of the chip ... is that internal
>> to the chip or are those parts and connections to be fabricated and
>> soldered?
>
>The inverters (large triangles with a dot on the pointy end, labelled
>"1" and "2") are internal to the chip. The four capacitors labelled C1
>(three drawn inside the chip outline, one outside) are external
>components.
>
>> ... I still don't understand about ground ...
>
>Just another way of refering to the negative connection of your power
>supply. I has it's roots way back in the days of vacuum tubes.
>
>> ... where do you connect the 1G and 2G pins? The R1 resitors that
>> just end in an arrow head......where do they connect?
>
>Those little down arrows are just a symbol for "ground", or the negative
>connection of your power supply.
>
>> I am electronically challenged ...
>
>We're all on the learning curve, just at different places. There's
>always someone a little higher up the curve :)
>
>A tip to help figure out the GND (negative) connection is this. On most
>of the 74-series chips (everyone I've ever encountered so far), the two
>power supplies are diagonally opposite. Positive is the highest numbered
>pin (directly across from pin 1), and negative is in the opposite row of
>pins, at the other end of the chip. If a person is using a symbol for
>GND that you aren't familiar with, identifying the ground pin this way
>helps you figure out what symbol is being used.
>
>Bruce
>
>
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