Re: 19,008 LEDs on the wall, 19,008 LEDs

["Michael J. Mahon" <mjmahon@aol.com>]

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

Impressive!  I see you've taken the resistive route to current limiting.

> 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.  :)

Except for EMI and the light that gets out the window, it's *all* heat
in the room.

-michael

Music synthesis for 8-bit Apple II's!
Home page:  http://members.aol.com/MJMahon/

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