New to multisim, question on this project

[kgb_m3]

I started taking digital 1 class and have this project due next week, I put it together just like the lab book has it shown and I'm not getting the 7 segment display to display anything.  LEDs aren't turning on either.  If someone can help me out with this would be greatly appreciated.

[kittmaster]

two of your power supplies are in backwards, and there is something wrong with the driver chip.  If I ground the output the segment lights up, if I do a lamp test, nothing works....probably problem with ic model......that is 5 minutes of anaylsis

[kgb_m3]

Thanks for your help, I realized the backwards power supplies, put everything like this, still nothing displays on the 7 segment display.

[NavyJay]

You should be more careful with the schematic entry.  For one thing you're applying -5VDC instead of +5VDC.  Check the polarity of your batteries.  It took some playing around with, but I got it working by using DGND (node 'GND') instead of AGND (node 0).  There is a difference in SPICE!

Also, I'm not sure if it's intentional, but your LEDs are dropping a constant 1.6V and only 3.4 V is getting to the input lines of the 74LS47N.  Seems to work regardless, though.

Let me know what I get for a grade.

-J 

[NavyJay]

Kittmaster beat me to it 🙂

Swap out your 'GROUND' symbols with 'DGND' 

[kgb_m3]

Thank you so much for all your help.  Applied the DGND instead and works like a charm.  This is my first time using multisim so I'm still learning, it's a great program just takes time getting used to.