Do you mean 3.2V on the LED itself? What color LED?
Since this circuit is using the HC595 as a high side driver it won't be easy to replace with something more powerful. The Fairchild data sheet says 35mA per I/O pin but there's a 70mA limit for DC on each power/ground pin.
Let's do some research - if we turn the LEDs around then we could use p-channel MOSFETs on the 16 rows and a small transistor on each of the 125 columns.
Since this circuit is using the HC595 as a high side driver it won't be easy to replace with something more powerful. The Fairchild data sheet says 35mA per I/O pin but there's a 70mA limit for DC on each power/ground pin.
Let's do some research - if we turn the LEDs around then we could use p-channel MOSFETs on the 16 rows and a small transistor on each of the 125 columns.
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