10-29-2006 01:56 AM
10-30-2006 12:54 PM
10-30-2006 02:05 PM
10-30-2006 03:43 PM
10-30-2006 04:04 PM
@lacy wrote:
I just took a peek at your circuit. You have VCC but no Digital Ground. Some IC's require VCC or VDD and a VGND (Digital Ground in MUltisim 9) on the page in order to simulate correctly. I did not simulate your circuit since I only have the Freware edition of Multisim 9. Give my sugesttion a try and see if that helps.
10-30-2006 04:20 PM
Lacy,
Thanks for helping out on this forum. I was stuck in placing VDD and DGND but it was not working for me, I'm glad it worked for Roby though.
10-30-2006 06:27 PM
10-31-2006 09:16 AM
Thanks Lacy, I am myself building experience with Multisim as well, I have long time experience with NI products though, but I'm starting to use more and more Multisim and Ultiboard, hopefully in a couple of months I will be more helpful for this forum. Thanks for the explanation, I tried that on the circuit file I downloaded and it worked....
10-31-2006 10:02 AM
10-31-2006 03:26 PM
Roby, I was looking further deep into this problem, since I also assume mine was working because of the LED light on, however, as you said, it was not counting.
Unfortunately, while troubleshooting this circuit I came across one note from our developers, apparently the 4060 SPICE model inside our engine is not working correctly, specifically the section for the oscillator, that will explain why is not counting. They have a corrective request to fix this though.
In the meantime, I used another similar counter, the 4020, and I got it to work, although you need to supply external clock, which you could either build with a simple oscillator circuit or a clock circuit. Check the image included. If you can change the circuit used (4060 --> 4020) please do so, if not, substitute it in the schematic for simulation purposes only and keep the 4060 for your real design.