David Meiklejohn wrote:
> Jinx wrote:
>   
>> IMHO 3V is just too low for that circuit. If the high- and low-side
>> drivers each drop a volt (the 2003 at least has Darlington outputs),
>> after the current-limiting resistor that leaves crumbs for the LEDs.
>> And the LEDs are an important part of this project
>>     
>
> Something I'm not clear on, though, is why high-side drivers are needed at
> all.

A single PIC pin can give 20 mA without a problem, but it can't give 20 
mA on seven pins at the same time. Hence the highside drivers.

However I'm thinking of getting rid of the highside drivers and instead 
multiplexing the display so only half a column is on at a time...

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