LED Display Protection

all i got was

RENEW THIS DOMAIN?

martin

AHHHH!!!!! It expired 7 days ago!!! Thanks for the heads up! :)

Since I am using my own DNS server it kept resolving for me!!! :)

Hmmm? I see all three images.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Why are you driving them with such a low duty cycle? You're asking for trouble. Have you tested this in a small scale before pulling out the soldering iron?

Best regards, Spehro Pefhany

--
"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

Oops, 1/12.5 isn't that bad, forget my commment.

The requirement is similar to that of a watchdog timer. Maybe 11 timers with the outputs OR'd to a shutdown would be better than one timer.

Best regards, Spehro Pefhany

--
"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

I got: stockly.com This domain name expired on 05/13/2006 and is pending renewal or deletion.

OP, if you want that domain, you ought to pay up quick, May I suggest moving it to godaddy.com, they have a sale on transfers.

The name is safe until 2015! I need to change the administrative e-mail to something I actually check! :) Wow, that was close!

The LED is not the best choice for a display like this, but I had

50,000 of them...

It is an HP HLMP-3507.

There are a few threads on the project...

Search for RamWall to find more.

Here is the driver circuit I want to use:

And the master circuit:

Some other random pictures from the project:

A simple & effecive protection method is to AC couple the drive to the row switching devices. If you are using HC595s or similar columnr drivers, you could do a similar thing using the output enable - use a simple charge-pump type arrangement so it is only held low in the presence of clock pulses.

wow thats a lot of led soldering, I sometimes dream of making a LED television but with 2 million LEDs for a good picture that would be too much !

wonder if theyl ever get printable LEDs practicable.

Colin =^.^=

Maybe instead you could use 20-30 VGA monitors. Just fake big pixels and use a few microcontrollers to bit bang the color boxes onto the screen.

Hey, that might actually make a good project... Hmmm... :)

ermm, the idea was to be able to hang it on my wall, ie get rid of the bulky CRT, or did you mean the flat panel type ? I have seen large TV displays at places like le mans wich are giant boards made up of small indicators

Colin =^.^=

The only reason I built that 7x3.5 foot .4" pitch display is because a few years ago I bought 50,000 green LEDs on ebay for $300. They've been haunting me on a shelf (all 10 boxes of 5,000), so I decided to shell out $350 to have 20 13x13" PCBs etched.

I am DONE soldering LEDs...no more!@ :) I want to interface this LED wall to the Altair. The Altair is all about blinking lights, and I'll have just under 20,000 of them blinking away. ;)