chriscross1966
New Member
Hi folks, first post so please be gentle I'm knocking up a small veroboard to count events received as GPO pulses from some equipment I use at work. We want to be able to see it across the room so we're using 4" common-anode led displays (already got these). To keep it simple we're just using a pair of 4033's with the GPO's feeding the clock of the 1's digit and the carry out of that feeding the clock of the 10's digit. I've got a choice of ULN2003 or ULN2804 for the darlington driver (got them lying around) . I think as it's a common anode device I'll need the 2804, but I've never used them before and am a bit dense when it comes to logic stuff anyway so do I need an inverter between the 4033 and the input of the darlingtons, ie are they active low or active high?
Many thanks
chrisc
Many thanks
chrisc