7 Segment display - help.

Folks, my old books are no longer valid.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?

lost_and_confused: I am going for a 4056. I hope that drives "common cathode" displays.

There's no hoping in electronics.

A 4511 will do for common-cathodes. http://www.doctronics.co.uk/4511.htm

4056 - I think that chip is specially for LCDs rather than LEDs - you need a higher current output for LEDs, the 4511 is one I used in a previous universe(!) for common-cathode displays. Latches and does bcd -> 7seg

Yeah, sorry as I think I said, my "data books" are from the 80's.

Shall have to look around a bit more.

So I shall be using a 4511.

The "4013" marking might be related to a Fairchild FLB4013X1 - 2" by 1.2" large 7-seg display with 4 digits? The best my web search found.