Pulse counter using Digital IC and 7-seg display.

ian field

Joined Oct 27, 2012
6,536
Right on, 4511, latch, 7 seg. decoder, healthy driver, Vcc 5V, 25 mA for common cathode disp.
Equally vague recollection - I think the 4518 is commonly used with the 4511, but I don't remember the details.

Its a long time since I did any of that, I bought a stick of both types from Farnell but the project fell by the wayside.
 

GopherT

Joined Nov 23, 2012
8,009
Equally vague recollection - I think the 4518 is commonly used with the 4511, but I don't remember the details.

Its a long time since I did any of that, I bought a stick of both types from Farnell but the project fell by the wayside.
The cd4510 (BCD), 4516 and 4518 can be used together with the 4511 but, the 4516 and 4518 count 0-15 so need to be accounted for in a reset or preload OS some time. The 4516 can count up/down and the 4518 has the two enable pins.
 

hp1729

Joined Nov 23, 2015
2,304
Design 891 7449 example.PNG
Hi All,
Before I apply the circuit you have suggested, I encountered a strange situation with 7segment display. The driver IC is 74ls49 (open collector). From my lab I got common anode 7segment display. So on a breadboard I wired the 74LS49 and that 7seg display as following:
Anode of 7seg display to +5V, and the a to g pins of 7seg connected to a to g pins of 74LS49 with 510ohm registors (this limits the current to 5mA for each segment of the 7seg). But here comes the funny part, with all input A,B,C,D of 74LS49 to ground (BCD zero) I see number 8 in the 7 segment!! So my logic got inverted. With 0001 BCD I see mirrored 3 in the 7seg. I am going to check if the lab has common cathode 7seg, that will make life easy. But if there is not, would it be possible to use common anode anyway?
Yes, open collector output but active high. Examples of circuits attached.
 
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