generator

[ngogketrao]

Hi everybody!
 I am all new to Multisim (i have the full pro edition v10.0) and i have read some documents about it but there is one thing that keeps annoying me: I don't know how to input signals in my schematics for simulation. i have encountered some cases like random number generator, 0 to 7 binary counter and so on... are these like entire circuits( to be built first) or simply some devices? because i cannot find them in the library.
  thanks!

[lacy]

I am not exactly sure what your looking for, but I'll take a stab at it. There are instruments and sources to use for signal inputs. The signal generator and word generator are in the Instrument toolbar on the right hand side of the screen. The rest of the signals that can be used are in the sources category in the database.

You mention binary counters. These would be integrated circuits usually in the digital category under cmos or ttl

As far as I know there is no random number generator and is probably a circuit you would have to build.

I hope I have understood your question and my anser has help in some way.

[ngogketrao]

thank you for your fast reply. It solves the first part of my question. can you tell me what i can use as a 0 to 7 binary counter?
 thank you.

[lacy]

There may be two ways to accomplish this. The first would be to use the word generator as a binary up/down counter. You can consult your help file or documentation in order to learn how to set it up to do this (It would be difficult for me to explain it so you can understand it and the documentation does a better job at that than I could). The second approach would be to construct a circuit with the BCD counters that are available in the database.

These are the only 2 option that I can think of that would help. I hope this is what you are looking for.

[ngogketrao]

Multisim  -  2007-11-07 10:49:38

ERC [3-digit 7-segment display]  <2007-11-07 10:49:58>
   Error: Connecting 'Out to Bidirectional';   [U1 pin 10, 3-digit 7-segment display]  to  [U4 pin D, 3-digit 7-segment display]
   Error: Connecting 'Out to Bidirectional';   [U1 pin 9, 3-digit 7-segment display]  to  [U4 pin E, 3-digit 7-segment display]
   Error: Connecting 'Out to Bidirectional';   [U1 pin 15, 3-digit 7-segment display]  to  [U4 pin F, 3-digit 7-segment display]
   Error: Connecting 'Out to Bidirectional';   [U1 pin 14, 3-digit 7-segment display]  to  [U4 pin G, 3-digit 7-segment display]
   Error: Connecting 'Out to Bidirectional';   [U1 pin 13, 3-digit 7-segment display]  to  [U4 pin A, 3-digit 7-segment display]
   Error: Connecting 'Out to Bidirectional';   [U1 pin 12, 3-digit 7-segment display]  to  [U4 pin B, 3-digit 7-segment display]
   Error: Connecting 'Out to Bidirectional';   [U1 pin 11, 3-digit 7-segment display]  to  [U4 pin C, 3-digit 7-segment display]
ERC [3-digit 7-segment display] completed;  7 error(s), 0 warning(s);  Time: 0:00.06

 can you tell me how to resolve this? I got the same error messages with the circuit that you sent me though it works.

[lacy]

These are ERC errors. Technically they don't mean much if the circuit simulates properly. You can set up your ERC to suit yourself and is not based on any standards except the ones you set. If your circuit simulates properly and you get the results you are expecting you can either ignore them or you can adjust them out by going to TOOLS>ELECTRICAL RULES CHECK>ERC RULES. Go down the chart to find BI and then goto the right to OUT and click it until it turns green.

I hardly ever use the electrical rules check. If my circuit simualtes then I know it is correct. The only thing I usually use it for is to find unconnected pins or excluded pins. The rest I usually ignore.

[ngogketrao]

 Hi!
   I drew some schematics for my learning but unfortunately there are some that on simulation don't give the expected results. I tried everything that i could but still not working. i have attached two schematics to this post. Please what's wrong with them?

  thank you

[lacy]

The first circuit is obvious to me. Take your pin 3 connection fro the timer and move it from VSS to CP0 (pin 14) on the 4017. Place a VSS source on the scehmatic and tie that to the VSS pin on the 4017.  Try that for the first schematic and let me know the results.

For the second on I would have to plug that into the simulator and check it. I will have to do that later today and it may take me a while to get back with you on that one.

Just so you know you can post your actual files that are created with Multisim to this forum. Just save your schematic to your hard drive and then below the post window there is a box that says "Attachment" Just click on the browse button beside it and goto to the location that you saved your Multisim file highlight it and click open in the browser box. This will put the file into the little box and when you press "submit" the post as well as the file will put up on the forum.

[lacy]

The first circuit is obvious to me. Take your pin 3 connection fro the timer and move it from VSS to CP0 (pin 14) on the 4017. Place a VSS source on the scehmatic and tie that to the VSS pin on the 4017.  Try that for the first schematic and let me know the results.

For the second on I would have to plug that into the simulator and check it. I will have to do that later today and it may take me a while to get back with you on that one.

Just so you know you can post your actual files that are created with Multisim to this forum. Just save your schematic to your hard drive and then below the post window there is a box that says "Attachment" Just click on the browse button beside it and goto to the location that you saved your Multisim file highlight it and click open in the browser box. This will put the file into the little box and when you press "submit" the post as well as the file will put up on the forum. In other words, post the Multsim

[lacy]

The first circuit is obvious to me. Take your pin 3 connection fro the timer and move it from VSS to CP0 (pin 14) on the 4017. Place a VSS source on the scehmatic and tie that to the VSS pin on the 4017.  Try that for the first schematic and let me know the results.

For the second on I would have to plug that into the simulator and check it. I will have to do that later today and it may take me a while to get back with you on that one.

Just so you know you can post your actual files that are created with Multisim to this forum. Just save your schematic to your hard drive and then below the post window there is a box that says "Attachment" Just click on the browse button beside it and goto to the location that you saved your Multisim file highlight it and click open in the browser box. This will put the file into the little box and when you press "submit" the post as well as the file will put up on the forum. In other words, post the Multsim file in the same manner