I need to drive a few 7 seg leds, and decided to go with the mc14511 mostly because of cost. It can drive common cathode leds directly, but mine are common anode, so I need to add a transistor in between each output. It makes for a lot of transistors and leds, but whatever. Here is the schem so far::
I wanted to replace the sot 32 transistors with an array, but all I could find on newark was a uln2004 Darlington array. So let me get this straight - I would need about 0.1% of the collector current to flow through the base, which is ridiculously small. I liberally guessed at a 200k resistor? is that right? is seems high, but then again, im using darlingtons to drive tiny leds. would there be anything wrong with using a smaller resistor value and letting more current through?