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'[OT] Too good (and cheap) to work?'
2004\09\15@015407 by Anand Dhuru

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Not quite a free lunch, but certainly a cheap one, if it works.

http://www.maxtheater.com/info.html

I'd like to have your opinion, guys, before I order.

Thanks and Regards,

Anand.

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2004\09\15@040759 by Moises Cambra

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> http://www.maxtheater.com/info.html
>
> I'd like to have your opinion, guys, before I order.

Why there are not any pictures or drawings of the product itself?
The 'Picture quality' screenshots don't prove anything.
Have you seen one in person?


Moises

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2004\09\15@041459 by hael Rigby-Jones

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>-----Original Message-----
>From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu]
>On Behalf Of Anand Dhuru
>Sent: 15 September 2004 06:54
>To: Microcontroller discussion list - Public.
>Subject: [OT] Too good (and cheap) to work?
>
>
>Not quite a free lunch, but certainly a cheap one, if it works.
>
>http://www.maxtheater.com/info.html
>
>I'd like to have your opinion, guys, before I order.
>
>Thanks and Regards,
>
>Anand.

Complete rubbish, scammers have been selling this kind of thing on Ebay for
years. http://www.100inchtv.com/ has also been around for ages.

Simply put, a standard CRT does not have anything like enough brightness to
project an image of this size.  You'd have to be in a completely dark room
to see anything, and even then it simply would not be bright enough.  You
also get quite a lot of distortion near the egdes of the projected picture.


If you can pick up a suitable fresnel lens from one of the surplass
companies cheaply enough, it may be worth trying just to satisfy your
curiosity, but it certainly won't be suitable for any serious home cinema
use.

Regards

Mike

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2004\09\15@043345 by Jason S

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Just to clarify, that's exactly that they're selling; a fresnel lens.

Jason

From: "Michael Rigby-Jones" <Michael.Rigby-JonesspamKILLspambookham.com>
Sent: Wednesday, September 15, 2004 1:18 AM


> If you can pick up a suitable fresnel lens from one of the surplass
> companies cheaply enough, it may be worth trying just to satisfy your
> curiosity, but it certainly won't be suitable for any serious home cinema
> use.



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2004\09\15@052734 by Ward, David
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Agreed,  just buy yourself a whole page magnifier Fresnel lens and stick it
over a hole in a a cardboard box large enough to cover the front of your
telly.

It's a great toy, but you either need to mirror image the original video,
flip the tv scan coils, or project via a mirror as the lens will invert the
image

Have a good old fashioned Google for DIY projector TVs

Putting a handheld LCD TV display into a slide projector is another fun
party trick ;-)

Dave


{Original Message removed}

2004\09\15@054610 by Anand Dhuru

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Thanks, guys. US$ 16.95 duly saved.

Anand

----- Original Message -----
From: "Michael Rigby-Jones" <.....Michael.Rigby-JonesKILLspamspam.....bookham.com>
To: "'Microcontroller discussion list - Public.'" <EraseMEpiclistspam_OUTspamTakeThisOuTmit.edu>
Sent: Wednesday, September 15, 2004 1:48 PM
Subject: RE: [OT] Too good (and cheap) to work?


>
>
> >{Original Message removed}

2004\09\15@091054 by hael Rigby-Jones

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>-----Original Message-----
>From: piclist-bouncesspamspam_OUTmit.edu [@spam@piclist-bouncesKILLspamspammit.edu]
>On Behalf Of Ward, David
>Sent: 15 September 2004 10:28
>To: 'Microcontroller discussion list - Public.'
>Subject: RE: [OT] Too good (and cheap) to work?
>
>
>Agreed,  just buy yourself a whole page magnifier Fresnel lens
>and stick it over a hole in a a cardboard box large enough to
>cover the front of your telly.
>
>It's a great toy, but you either need to mirror image the
>original video, flip the tv scan coils, or project via a
>mirror as the lens will invert the image

Or turn the TV upside down...

>
>Have a good old fashioned Google for DIY projector TVs
>
>Putting a handheld LCD TV display into a slide projector is
>another fun party trick ;-)
>
>Dave

Been there, tried that. Got the LCD so hot it stopped working.  Contrast was
very poor as was the resolution due to being one of the first generation of
handheld TV's and had about 100 lines max by the look of it (can't read
subtitles on it anyway).  Was a fun experiment though.

Regards

Mike

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2004\09\15@103655 by Herbert Graf

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On Wed, 2004-09-15 at 01:54, Anand Dhuru wrote:
> Not quite a free lunch, but certainly a cheap one, if it works.
>
> http://www.maxtheater.com/info.html
>
> I'd like to have your opinion, guys, before I order.
>
> Thanks and Regards,

I've seen this before. In fact I think even perhaps on this list?
Anyways, the consensus of wherever I heard it before it don't bother. I
believe all it is is one of those large flat plastic Fresnel type
lenses. The final thoughts were a TV screen is NOWHERE near bright
enough for this scheme to be worth any money. TTYL

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2004\09\15@104818 by Dave VanHorn

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Take your existing screen brightness, take it down 20% for the lens, then spread that light out over the whole area.. Not very bright at all.
You do have to flip the yoke.

Basically, with a high $ screen, in a dark room, starting with a larger screen, you can maybe get to an acceptable result.

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2004\09\15@110822 by hael Rigby-Jones

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{Quote hidden}

By pure coincidence, a guy on a forum I frequent just posted his setup using
an overhead projector and a modified TFT panel:


"Ok quick run down of parts.

1x15" TFT screen because I want a decent resolution to play PC games,
obviously no difference to the TV card, or DVDs as there resolution is
lower.

Reason for above gives me a power supply, and pc connection with no hard
work.

1xOverhead projector, the old one you would have had at school, one I got
from army and general store cost 25

1x small 6" fan clipped onto projector arm to provide cooling to TFT screen

1x Big can of white paint, when I started as was expecting similar throw to
a standard digital projector, but forgot that I was projecting through a 15"
screen where as they start at about 3.5" tft matrixes so thats why my throw
is so great. Started the projector with my brother so we could play doom at
what we where expecting as about 30" ish and said bugger, I better paint the
whole wall.

Best TFT screen is an Advent, reason is becasue of the ribbon cable connect
that connects one side to the otherside of the TFT, mine isnt so had to do
some very tricky soldering. The advent that we got for my brother has a long
enough ribben so you dont need to solder.

As I said its not pretty but its damn good, bulbs are cheaper, and it cost
so very little for a throw thats better, and pixel ratio also better.

Edited to say, forgot you need to do some cutting of the OHP top where the
glass is as its too small for the TFT screen, also as I have a 15" tft with
a standard fresnel im missing a bit left and right off the screen. If I
could find a cheap 12x12" fresnel then id have the whole screen and even
bigger throw. "




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2004\09\15@121423 by Peter Johansson

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Jason S writes:

> Just to clarify, that's exactly that they're selling; a fresnel lens.

Does anyone happen to know if the fresnel lens is the size of the
screen, i.e. 175" diag.?  Seventeen bucks for a fresnel lens that size
is a reall good deal!  I had *lots* of fun with a 20" square fresnel
lens back when I was a kid.  ;-)

-p.
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2004\09\15@181742 by Josh Koffman

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It isn't. Think about how much shipping would be on a 175" lens?

Josh
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On Wed, 15 Sep 2004 12:14:22 -0400, Peter Johansson <TakeThisOuTpeterEraseMEspamspam_OUTelemental.org> wrote:
> Does anyone happen to know if the fresnel lens is the size of the
> screen, i.e. 175" diag.?  Seventeen bucks for a fresnel lens that size
> is a reall good deal!  I had *lots* of fun with a 20" square fresnel
> lens back when I was a kid.  ;-)
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2004\09\15@190442 by Peter Johansson

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I've seen fresnel lenses cut into thin acetate which can then be
rolled into a mailing tube and shipped like a poster.  In fact, I was
half hoping that was what this was, becuse I could use such an item.

-p.

Josh Koffman writes:

{Quote hidden}

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2004\09\16@092954 by Peter L. Peres

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On Wed, 15 Sep 2004, Dave VanHorn wrote:

>
> Take your existing screen brightness, take it down 20% for the lens,
> then spread that light out over the whole area.. Not very bright at all.
> You do have to flip the yoke.

And spend a nice half day doing the convergence and color purity thing
while watching a mirrored test pattern picture that will confuse you very
thoroughly.

Peter
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2004\09\16@094811 by hael Rigby-Jones

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{Quote hidden}

Or just turn the TV upside down...

Mike

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2004\09\16@101118 by Dave VanHorn

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At 03:33 PM 9/16/2004, Peter L. Peres wrote:



>On Wed, 15 Sep 2004, Dave VanHorn wrote:
>
>>
>>Take your existing screen brightness, take it down 20% for the lens, then spread that light out over the whole area.. Not very bright at all. You do have to flip the yoke.
>
>And spend a nice half day doing the convergence and color purity thing while watching a mirrored test pattern picture that will confuse you very thoroughly.

:)  These days, I don't think they even HAVE convergence adjustments.
I used to do TV repair, way back when.. One of our competitors was famous for breaking off the coils. You'd pull the back, and see coils hanging there by their wires..


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2004\09\16@105239 by andrej.nemec

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Or even better. Do not watch the TV. Spend your time on something more ...

I think i should polish up my English ... ;-)))



On 16 Sep 2004 at 14:51, Michael Rigby-Jones wrote:

>
>
> >{Original Message removed}

2004\09\16@115550 by Robin.Bussell

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>Or just turn the TV upside down..

Now I was told on a computer graphics course ages ago that doing that
would give you more purity problems on a large CRT due to the earths field...
Apparantly you'd also have problems if you (somehow) exported a large
computer monitor from the southern hemisphere and tried to use it up here,
the manufacturers apply suitable bias at the adjustment stage and allegedly
have large coils around the adjustment area of the factory to simulate the
earths field for their intended destination market.
Can anyone confirm or deny this?

In a moment of idleness a while back I turned an LCD display upside down
and was amazed  (in a 'doh! of course' type of way ) that all the buttons on
the windows application the monitor was showing had inverted! It's a great
demonstration for people who are starting to live the metaphors their
computers force on them too much... along with the old "use a snapshot
of their desktop as wallpaper and hide the real icons" trick of course :-)

Cheers,
           Robin.





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2004\09\16@121710 by Dave VanHorn

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At 10:47 AM 9/16/2004, RemoveMERobin.BussellEraseMEspamEraseMEaxa-sunlife.co.uk wrote:



>>Or just turn the TV upside down..
>
>Now I was told on a computer graphics course ages ago that doing that
>would give you more purity problems on a large CRT due to the earths field...

Yup. And convergence, and you had better add a fan to deal with the heat flow issues.

>Apparantly you'd also have problems if you (somehow) exported a large
>computer monitor from the southern hemisphere and tried to use it up here,
>the manufacturers apply suitable bias at the adjustment stage and allegedly
>have large coils around the adjustment area of the factory to simulate the
>earths field for their intended destination market.
>Can anyone confirm or deny this?

Doubtful, how would they know which way it would face?

>In a moment of idleness a while back I turned an LCD display upside down
>and was amazed  (in a 'doh! of course' type of way ) that all the buttons on
>the windows application the monitor was showing had inverted! It's a great
>demonstration for people who are starting to live the metaphors their
>computers force on them too much... along with the old "use a snapshot
>of their desktop as wallpaper and hide the real icons" trick of course :-)

In the old days, I worked with a fellow who was known to come in on mondays with a pretty good hangover.  Flipping the connections on his monitor yoke was good for a laugh.

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2004\09\16@123419 by Peter Johansson

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Dave VanHorn writes:

> In the old days, I worked with a fellow who was known to come in on
> mondays with a pretty good hangover.  Flipping the connections on
> his monitor yoke was good for a laugh.

In the old days, when 'xhost +' was the default on many X/Windows
workstations, we would randomly remap a few keys every few seconds.  A
read mindf* for the victim and practically impossible to catch.

-p.

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2004\09\16@124925 by Wouter van Ooijen

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> This email originates from AXA Sun Life Services Plc (reg.

(snip 29 lines! of sig)

Judging from the length of your sig you must be working for a burocracy
that would have put the former soviet regime to shame :) I guess your
company website must look like a webpage from hell (I can't find that
lovely page again, 5 or more scrollbars, no meaningfull text etc.
http://www.eurocircuits.com is a good attempt).

Don't worry, the subject was already [OT].

Wouter van Ooijen

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