Folks, my old books are no longer valid.
They have chips in them which aren't available and there are new chips which aren't listed.
I want a BCD - 7 segment display driver.
I am going for a 4056.
I hope that drives "common cathode" displays.
Of course the next problem is (though I think I have nutted it out) the 7 segment display I have.
It has 4013 stamped on the side of it. It has 10 pins. Counting them the way you do an IC, I have determined: 1 - cathode. 2 -> 5, 8 -> 10 are the display and 7 is the RIGHT decimal point.
Pin 6 doesn't seem to be used though there is a LEFT decimal point.
I guess if running on 12v I will need 150 ohm resistors between the 4056 and the display?