Transistor drivers vs IC drivers.
On the cathodes I use ULN2803 chips (pos in to the ULN2803 provides neg out ot the LED cathodes).
I had been using PNP transistors / resistor circuits on my LED anodes (neg in to the transistor provides pos out into the LED anodes).
However, after reading this thread more yesterday, I see that a UDN2981 is a good substitute for the PNP transistor / resistor circuits. I ordered some samples from Allegro Microsystems Inc. yesterday.
On the cathodes I use ULN2803 chips (pos in to the ULN2803 provides neg out ot the LED cathodes).
I had been using PNP transistors / resistor circuits on my LED anodes (neg in to the transistor provides pos out into the LED anodes).
However, after reading this thread more yesterday, I see that a UDN2981 is a good substitute for the PNP transistor / resistor circuits. I ordered some samples from Allegro Microsystems Inc. yesterday.