MarkT:
CD4000 series cannot output 5--10mA. 2--3 mA maybe with some voltage drop.
yeah, looking at the datasheet that seems more accurate.
still, it is enough to drive an LED without a CL-res, right ?
MarkT:
I'd recommend using 74HCxx logic family as they can actually drive an LED and are not
ancient. Better performance, better latch-up immunity, better ESD protection, works
at 3.3V without being extremely slow, will be available for decades.
they are also more expensive - twice the price of the 4000 series from where i went to buy them...
since this is more for a learning experience and not an actual project application, i thought it should be fine.