8x8 RGB LED matrix design

Design Concepts
1

Howdy!

I’ve been reading and copying designs from the kings on the topic;

http://www.midibox.org/forum/index.php/topic,10476.0.html

http://www.suckow.de/ralf/ledmatrix4x20/

I’ve drawn up and attached my design for an 8x8 RBG matrix and was wondering if anyone could pass comment if they see any issues with it. I’m not familiar with using those ULN2003A’s but I guess it’s to supply more power to drive all the LED’s? I intend to use the standard DOUT board but just re[place the output resistors and add the ULN2003A’s as shown.

Was also wondering - if you had 2 of these circuits running off one core would there be enough power running through the whole setup to be OK (provided you feed the core with say 2-3 amps) ?

Cheers

42308x8LEDcircuitpng1821af2c9e68c6a9cce8c497c2ddbf7b
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42308x8LEDcircuitpng1821af2c9e68c6a9cce8c497c2ddbf7b
42308x8LEDcircuitpng1821af2c9e68c6a9cce8c497c2ddbf7b859×830 71.1 KB

2

Was also wondering - if you had 2 of these circuits running off one core would there be enough power running through the whole setup to be OK (provided you feed the core with say 2-3 amps) ?

Heh, short question, long answer…

Handy search terms: DOUT DIN SR 595 165 LED matrix current sink draw ULN transistor vreg regulator max

I hope someone feels like typing an FBAP or you’re up for lots of reading old threads :smiley:

3

Cheers yeah I thought it would be a heavy discussion.

Does anyone see anything obviously wrong with the circuit - it’s pretty much a clone of the existing ones floating around in the forums…so guess it’ll be ok ?