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'virtual car [OT]'
2000\03\07@033554 by Michael Rigby-Jones

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<P><FONT SIZE=2 FACE="Arial">--</FONT>
<BR><FONT SIZE=2 FACE="Arial">Best regards</FONT>
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<P><FONT SIZE=2 FACE="Arial">Tony</FONT>
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<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">I have to admitt, I've always wondered about this.&nbsp; Here in front of me is a Farnell catalogue with a TO220 device rated for 110 Amps continuous, 420Amps pulsed!!!&nbsp; I just can't see the legs on this device taking that current for more than a few ms, let alone the internal bond wires.&nbsp; On a slightly unrelated note, does anyone know of a MOSFET *full* H-Bridge in an SO package or smaller.&nbsp; Max current is about 2 amps.&nbsp; Half bridges seem to be ten a penny, but full bridges seem to be virtually unobtainable in anything smaller than DIP.</FONT></P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Mike</FONT>
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2000\03\07@050912 by David VanHorn

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>
>
> I have to admitt, I've always wondered about this.  Here in front of me is a
> Farnell catalogue with a TO220 device rated for 110 Amps continuous, 420Amps
> pulsed!!!  I just can't see the legs on this device taking that current for
> more than a few ms, let alone the internal bond wires.  On a slightly
> unrelated note, does anyone know of a MOSFET *full* H-Bridge in an SO
package
> or smaller.  Max current is about 2 amps.  Half bridges seem to be ten a
> penny, but full bridges seem to be virtually unobtainable in anything
smaller
> than DIP.


Check the Zetex offerings in Digi-Key. IIRC, they had a full bridge in that
range, in an SO-8.
Make sure it's ON or OFF though :)

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'virtual car [OT]'
2000\05\22@011111 by Dale Botkin
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On Mon, 22 May 2000, Tony Nixon wrote:

> I don't know if anyones been interested, but I've just completed 3 tests
> of the virtual cars. Two of the new vehicles were written off totally
> after impact with barriers, and one survived reasonably well.

8< snip...

> I have to say, it is an experience driving a vehicle at 110 KPH
> controlled by a handful of PICs and a mini camera to 'see' by. It's very
> spectacular at the end and I'm sure I flinch when the cars finally come
> to grief. It surely will be the most expensive Nintendo game I'll ever
> play :-)

I'd give a beer, a brat, and a good cigar to hear the whole story on this
project...  and make that a Cuban if I got to drive one of the cars!

Dale
---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov

2000\05\22@015344 by Tony Nixon

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Dale Botkin wrote:

> I'd give a beer, a brat, and a good cigar to hear the whole story on this
> project...  and make that a Cuban if I got to drive one of the cars!

I'd love to tell all, but it is a research project and unfortunately
it's not my call :-(

I've got my eyes and ears open to see if any of it finds it's way onto
the web. If it does I'll post the link.

--
Best regards

Tony

http://www.picnpoke.com
spam_OUTsalesTakeThisOuTspampicnpoke.com

2000\05\31@135124 by Robert Rolf

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"Larry P. Thomas wa0gwa" wrote:
>
> >It would be interesting to see if two video cameras could
> >be set up for stereo vision to see how much spacial improvement it
> >gives.
>
> The army was doing this for a remote mine sweeper using some video
> transmitters I designed some 12 years ago.  I had the opportunity to see
> and view the results of the work.  The used two cameras on a rack and
> pinion which allowed them to vary the camera to camera spacing.  Each
> camera had its own transmit frequency to two separate monitors using
> polarizing filter material and semi silvered mirror/glass so both eyes saw
> both monitors and the viewer used polarizing glasses to direct the
> images.  It would be interesting to genlock the two cameras together and

You really only need ONE camera and a suitable periscope arrangement
with dichroic filters to provide a 'red' view and a 'cyan' one.

> let one contribute to the RED and the other contribute to the GREEN or >BLUE

Well actually you want GREEN AND BLUE to get Cyan for maximum
attenuation
of the opposing eye. BUT, and this is why I post, how can this work
if the Green OR the Blue components would make it through the Red filter
with only partial attenuation? Why would our =perception- of Cyan be
filtered?

> of a composite NTSC color signal to a single monitor and them use the
> typical 3D glasses that show up from time to time.

It's been done. Color based stereo works OK for low chroma type images,
but is terrible for anything with strong colors.

The funny thing is the early 3-D Imax films used chroma based glasses
(since they were cheap enough to be disposable), and the images
looked pretty good. Must have been the subtractive color process used
in film vs the additive used in TV.


> BTW, the used stereo sound also which really tended to cause you to want to
> turn your head to see where the sound was coming from.  All in all it was a
> weird trip to see the TV screen pop into 3D once the eyes and brain figured
> out what it was receiving.

Yes, it's pretty cool. And probably made you nauseous since your brain
was getting strong motion information while your inner ears were
getting none.

I remember my first experience with a spinning representation of a
molecule on an ancient vector graphics display. The fellow showing
me the model let me tweak the position controls until I got good
binocular fusion and then he cranked up the 'pinch' control (3D depth)
just as the top part of the model swung toward me. I jumped back a foot,
and he laughed. I guess he did this fairly often to the 'newbies'.

Robert

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