Need help with creating a BCD to 7 Segment Decoder using Logic Gates

[NickZF]

I guess I'm a bit stumped here.  I'm trying to create a 7 segment decoder with AND, NOT and OR gates, but I don't seem to be having any luck with getting the display numbers 1, 4 and 9 to work.

Any help would be appreciated, thanks.

[Tien_P · Accepted solution]

Spent a bit more time before you look at this link:

http://circuitscan.homestead.com/files/digelec/bcdto7seg.htm

[NickZF]

Thanks, Tien.  I re-analyzed my logic and it turns out I made a few silly K-map mistakes.  The updated circuit is attached if anyone is interested.

[ej8989]

I tried this and it worked on multisim. But when I'm trying to connect them on my breadboard they all light up no matter what switch are 1s and 0s. I'm using a 4-input dip switch. Any help?

[Tien_P]

Do you know if the 7 segment LED you used on the breadboard a common cathode or common anode?  Have a look at this to see how the LEDs are connected internally:

http://ee.hawaii.edu/~sasaki/EE361/Fall06/Lab/7disp.html

[elgalawan]

NEED HELP IN CREATING A 7 SEGMENT DECODER CIRCUIT USING NOR GATE

[Takoyaki143]

Hi mate do you have still a copy of your kmap in this circuitry?