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  #31  
Old 05-10-2007, 01:32 AM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 15 Jan 2006 04:32:13 -0800
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Well, its been 8 days since I started soldering.

7920 LEDs done, 9900 LEDs to go

I'll post some pictures in the morning. Now I'm off to
comp.arch.fpga for advice on this application.

I felt it was a mile stone if anything. If all goes well on Sunday
I'll have another 2970 down which will push me past the half way mark.
Then I'll feel better. Right now this thing is taking a long time. My
average is about 4 hours for each board of 990.

I bought brand new spools of solder in the beginning and I'm keeping
ALL of the cut off legs. Should make for some interesting statistics!
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  #32  
Old 05-10-2007, 01:33 AM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 24 Jan 2006 02:39:45 -0800
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Just thought I'd give an update:

-I've soldered 13,200+/-10 LEDs so far.
-Of the 16oz of solder I started with only 7.25oz is left. My food
scale isn't strong enough to weigh the cut off legs. My friend says he
has a digital one, so I'll try to get that.
-Only 5808 LEDs left. I have to finish this project by the 28th in
order to save face to a friend I made a bet with.

Keep pulling for me! I designed the column drivers. Looks like that
will be a project too.
Column Driver for 216 characters:
-54 - 74HC04
-27 - 74HC138
-27 - 74HC133
-27 - 74HC244
-432 - 74HC574
-216 - ULN2803
-1728 - 24ohm resistor
-etc

This is one build, thats for sure. Preliminary calculations are
showing 138.7A draw, 276watts of heat and 416watts of stuff other than
heat. Should be bright enough.
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  #33  
Old 05-10-2007, 01:33 AM
Grant Stockly Grant Stockly is offline
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From: "David L. Jones" <altz...@gmail.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 24 Jan 2006 17:45:24 -0800
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logjam wrote:
> Just thought I'd give an update:
>
> -I've soldered 13,200+/-10 LEDs so far.
> -Of the 16oz of solder I started with only 7.25oz is left. My food
> scale isn't strong enough to weigh the cut off legs. My friend says he
> has a digital one, so I'll try to get that.
> -Only 5808 LEDs left. I have to finish this project by the 28th in
> order to save face to a friend I made a bet with.
>
> Keep pulling for me! I designed the column drivers. Looks like that
> will be a project too.
> Column Driver for 216 characters:
> -54 - 74HC04
> -27 - 74HC138
> -27 - 74HC133
> -27 - 74HC244
> -432 - 74HC574
> -216 - ULN2803
> -1728 - 24ohm resistor
> -etc
>
> This is one build, thats for sure. Preliminary calculations are
> showing 138.7A draw, 276watts of heat and 416watts of stuff other than
> heat. Should be bright enough.

Holy LED display Batman!
Keep it up, we want lots of progress photos and of the final thing!

Has anyone else ever done an individual project of this scale before?

Dave
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  #34  
Old 05-10-2007, 01:33 AM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 26 Jan 2006 00:23:02 -0800
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I was soldering the 14th board on Tuesday. After a little over 600
LEDs I found that they were ALL in backwards!!!! : ( I don't have any
spare boars. At least 300 of the LEDs will need to be desoldered (but
I have a nice station so it shouldn't take too long). Its easier than
it sounds since I spray painted the boards black. Once I "think" I
have the board orientation right I was just blindly pushing them in.
Soldering 10,000 LEDs at 1000 a day tends to do that to you.

At this point I am VERY sick of the 20k LED project. So I decide to
visually (lighting the LEDs) test the 13 completed boards of 990.

I found one other board where I did 32 rows of 30 correctly and put one
row of 30 in backwards.

The other most common defect was soldering one pin and not soldering
the other.

I found that most of my brother's solder joints were cold, so I went
ahead and reflowed about 3 boards of 990 just to be safe even before I
did a test lighting.

If I solder one board Thursday and one board Friday I will have 3
boards for Saturday. At peak efficiency it will take 12 hours of solid
soldring to do 3 boards of 990. I have to get them done by the 28th to
win that bet. ; )

My next project is to make a set of PCBs for the Magic-1 TTL computer.
I think that even better than an Altair driving the display would be a
TTL computer.
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  #35  
Old 05-10-2007, 01:34 AM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 26 Jan 2006 02:17:54 -0800
Organization: http://groups.google.com
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The Hako desoldering iron works great. Took me about 35-40 minutes to
desolder 300LEDs. Why can't they go in that fast? : ( The whole kit
with extra tips cost me about $280. I never would have bought it
without a strong recomendation from a friend. It works much better
than I thought it would.
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  #36  
Old 05-10-2007, 01:34 AM
Grant Stockly Grant Stockly is offline
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From: Rich Grise <richgr...@example.net>
Organization: As Little As Possible
Subject: Re: Wall of RAM
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On Thu, 26 Jan 2006 00:23:02 -0800, logjam wrote:

> I was soldering the 14th board on Tuesday. After a little over 600 LEDs I
> found that they were ALL in backwards!!!! : ( I don't have any spare
> boars. At least 300 of the LEDs will need to be desoldered (but I have a
> nice station so it shouldn't take too long). Its easier than it sounds
> since I spray painted the boards black. Once I "think" I have the board
> orientation right I was just blindly pushing them in. Soldering 10,000
> LEDs at 1000 a day tends to do that to you.
>
> At this point I am VERY sick of the 20k LED project. So I decide to
> visually (lighting the LEDs) test the 13 completed boards of 990.
>
> I found one other board where I did 32 rows of 30 correctly and put one
> row of 30 in backwards.
>
> The other most common defect was soldering one pin and not soldering the
> other.
>
> I found that most of my brother's solder joints were cold, so I went ahead
> and reflowed about 3 boards of 990 just to be safe even before I did a
> test lighting.
>
> If I solder one board Thursday and one board Friday I will have 3 boards
> for Saturday. At peak efficiency it will take 12 hours of solid soldring
> to do 3 boards of 990. I have to get them done by the 28th to win that
> bet. ; )
>
> My next project is to make a set of PCBs for the Magic-1 TTL computer. I
> think that even better than an Altair driving the display would be a TTL
> computer.

OK, what's a "Magic-1"? Oh, wait a sec - google is our friend....
"Your search - "magic-1 ttl computer" - did not match any documents."

When I think "TTL Computer", I think DEC PDP-11, National IMP-16, and
Control Data Enhanced Normandale Controller/Tester. :-)

They all used 74181's. I also used to read the AMD AM2901 bit-slice
manuals and app notes, but I don't know if those things can even be
had in this century. )-;

(I'm sure the whole thing could be done in a CPLD, but what's the
fun in that? ;-) )

Good Luck!
Rich
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  #37  
Old 05-10-2007, 01:34 AM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 27 Jan 2006 01:16:43 -0800
Organization: http://groups.google.com
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Are you sure? I had documents:

http://www.google.com/search?hl=en&q...=Google+Search

Here is his link:

http://www.homebrewcpu.com/

If you think my project is crazy, take a look at all of his wire wrap
connections.
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  #38  
Old 05-10-2007, 01:35 AM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 30 Jan 2006 00:47:46 -0800
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I finished soldering all the LEDs on Saturday and spent Sunday mounting
all the boards. Pictures of the size of this thing at the bottom!

All 19008 LEDs have been tested. Not a single LED was bad.

Here is a picture and weight of 39584 LED legs: (yes, I saved them for
the purpose of weighing them. )
http://www.stockly.com/images2/06012..._Legs_2696.jpg

1565g!

Here is the display from the front:
http://www.stockly.com/images2/06012...Front_2718.jpg

and back:
http://www.stockly.com/images2/06012..._Back_2716.jpg

I have to admit, its huge. It wasn't so big in the drafting program on
my computer screen! Even I only discovered how big it was after all
the LEDs were soldered and I was placing them on the table for
drilling. WOW...

They're attached to an 81x34.5 piece of 1/4" plexiglass.

So, did you think this was really going to happen?
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  #39  
Old 05-10-2007, 01:35 AM
Grant Stockly Grant Stockly is offline
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From: "David L. Jones" <altz...@gmail.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 30 Jan 2006 03:47:53 -0800
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logjam wrote:
> I finished soldering all the LEDs on Saturday and spent Sunday mounting
> all the boards. Pictures of the size of this thing at the bottom!
>
> All 19008 LEDs have been tested. Not a single LED was bad.
>
> Here is a picture and weight of 39584 LED legs: (yes, I saved them for
> the purpose of weighing them. )
> http://www.stockly.com/images2/06012..._Legs_2696.jpg
>
> 1565g!
>
> Here is the display from the front:
> http://www.stockly.com/images2/06012...Front_2718.jpg
>
> and back:
> http://www.stockly.com/images2/06012..._Back_2716.jpg
>
> I have to admit, its huge. It wasn't so big in the drafting program on
> my computer screen! Even I only discovered how big it was after all
> the LEDs were soldered and I was placing them on the table for
> drilling. WOW...
>
> They're attached to an 81x34.5 piece of 1/4" plexiglass.
>
> So, did you think this was really going to happen?

Frigg'n brilliant Grant!
My propeller hat is off to you!

When can we see it actually lit up and playing PONG?

Dave
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  #40  
Old 05-10-2007, 01:35 AM
Grant Stockly Grant Stockly is offline
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From: "Tim Williams" <tmoran...@charter.net>
Newsgroups: sci.electronics.basics
References: <1136172350.049224.231720@o13g2000cwo.googlegroups .com> <1136173371.832018.44540@g44g2000cwa.googlegroups. com> <1136179693.825070.183100@g43g2000cwa.googlegroups .com> <5c60.43b8f53a.d0b55@clunker.homenet> <1136203193.354765.163350@o13g2000cwo.googlegroups .com> <a3259$43b99411$d844260c$5737@FUSE.NET> <1136239984.338696.151020@g14g2000cwa.googlegroups .com> <1136449750.355847.145030@g43g2000cwa.googlegroups .com> <1138099185.523514.24280@z14g2000cwz.googlegroups. com> <1138153524.809655.234750@o13g2000cwo.googlegroups .com> <1138263782.914693.122420@f14g2000cwb.googlegroups .com> <pan.2006.01.27.02.33.06.232164@example.net> <1138353403.165536.67230@o13g2000cwo.googlegroups. com> <1138610866.840863.145720@g14g2000cwa.googlegroups .com>
Subject: Re: Wall of RAM
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"logjam" <g...@cmosxray.com> wrote in message
news:1138610866.840863.145720@g14g2000cwa.googlegr oups.com...
> Here is a picture and weight of 39584 LED legs: (yes, I saved them for
> the purpose of weighing them. )
> http://www.stockly.com/images2/06012..._Legs_2696.jpg
>
> 1565g!

Does a magnet do anything to them? If not you could send them to me and I
could melt them down and cast some interesting object worthy of adorning
such an array :-)

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms
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