Now I am checking out if HC573 is strong enough to drive a 7-segment LED. I did the following test.
1. Connect HC03 to 3V3
2. HC573 output around 4V6 with connecting it to common anode 12.
3. HC573 output drops to 4V0 when all 7 segments and decimal point are switch on, through 560R x 8, with a total current of 12mA.
4. HC573 connecting to other two anodes also has all on for the other two LEDs
So far so good, now moving on to ULN2803.
.END
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