I want to try out the arduino ShiftOut tutorial (I can't post links yet) because I want to use around 50 or so RGB LEDs on one duemilanove (I know it's a lot...is it possible?). Could anyone point me to any info explaining what the numbers in these chips mean? In the tutorial it says to use a 74HC595 3-8 line decoder. Sparkfun sells a 74HC238 and I just ordered a sample from fairchild of MM74HCT138N. But they are all 3-8 line decoders, all appear to be CMOS and they all have that 74HC in them. What is the difference? Would I be able to run that tutorial with the chips I ordered?
Thanks so much for any help!