03-16-2008 08:22 AM - edited 03-16-2008 08:24 AM
I re-examined the circuit and it does work at 5V. I apooglize for my error on this, but I am not perfect all the time (Laughing). The problem stemmed mostly from the digital Hex displays and the digital probes. These have caused problems before in other circuits. I replace them with the non-digital displays and probes and that seem to cure it up, but I never changed the voltage back to see if that was a part of the problem.
You can use them in the simulator at 12V with no errors. This is something that may need to be examine at NI. If I can apply any voltage to an IC without an error popping up then like Lodin said that is problematic at the very least.
I thank you for bringing this to my attention. Usually when I screw up I do a good job of it.
03-16-2008 11:59 PM
The Dgnd was the problem! thanks! It now works.
However, the digital displays do not alternate the way they are supposd to. But this might be because the simulated transisters can't turn on and off fast enough.
What you should see on the displays is only a 5 and a 6. and they are not to show up on both displays! but they are.
03-17-2008 05:30 PM
07-21-2010 04:07 PM
I know your post is from some time ago but here goes anyway. I'm using Multisim 11 and every time I try to place a VCC on the schematic the software tells me that I have hidden power pins using on-page connectors with the name "VCC". I can't see any on-page connectors. The VCC and ground pins on the IC's are generally hidden and are powered just fine by the hidden VCC. But I need to add another voltage source to power the logic. I feel like I'm missing something very fundamental in the process. I also have trouble when I move the circuit to the breadboard and I get all sorts of connectevity errors that are all about the, now visible, VCC and ground pins. Again...am I missing something very fundamental here?
07-29-2010 02:04 PM
Many digital components have the power/ground pins hidden to reduce the number of wires on the schematic and these pins are pre-configured to have the power and ground pins virtually connected to the schematic's global power and ground nets.
In Multisim 11 we introduced On-Page Connectors to symbolize virtual connections and, in this particular case, when you try to place VCC, Multisim lets you know that a digital component has a hidden power pin with the same name (VCC), and this pin will be virtually connected to the power source
with a hidden on-page connector.
If you do not want to connect the power source to the power pin, you can change the net name.
I hope this helps.
12-16-2010 12:04 PM
I have a problem in working the 7 Segment i already connected to the 7447 but the output to the 7 segment voltage and current is so small
if anyone can help ?
12-20-2010 07:30 AM
11-10-2011 08:31 PM
I cannot for the life of me get my seven segment to work....HELP PLEASE!!!! :-( *sigh*. It works when i connect it manually on breadboard, but not in multisim
11-11-2011 06:42 AM - edited 11-11-2011 06:45 AM
Please read my other post 2 above yours. I made the changes listed (1,2, and 4) to your circuit and it worked correctly.