dot screen matrix

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Rami00972

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i found a schematic for dot screen matrix on the web. i'm going to use the same original schematic but with mux 74138 i designed the attached picture
is there any thing seems bad ..........
 

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That will work fine except that you need the resistors in the 2003 connections. Have you considered something like the MAX7219. One of these will drive an 8*8 display with multiple displays being easily implemented.

Mike.
 
hi Mike,
My datasheet shows the ULN2003A having 2K7 resistors internal, directly TTL compatable.?

Eric
 
Last edited:
mux 74138

is the connection of the 74138 correct.
coz this is the fears time that im using this ic "mux"
 
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