Thursday, August 26, 2010

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Digital Components in Multisim

When you create circuits with digital components in Multisim is important to note properly configure their supply (VCC) and ground (GND). Multisim many digital components such terminals have hidden to save space, For example, take as reference the counter 74190N:

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the symbolism of this component we can see that does not include power and ground terminals, but in reality if such points exist and are necessary for simulation. We will open the component's properties and go to the tab terminals ; in the field find hidden terminals VCC and GND (power and digital ground):



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This means that for this component to function properly require placing VCC and GND references somewhere in the circuit so that they are virtually connected to the counter.

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But there is more to take into account digital simulations Multisim. Go to menu Simulate >> Configuration ng Mixed-Mode Simulation:


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In the previous window we have two options: ideal simulation and real simulation. The theory tells us that if we select the first option is not necessary to place the references to VCC and GND on the circuit, but I prefer and recommend to always use the second option (real simulation) it will give us better results. As indicated by this option, you must place the digital reference power and ground.


To see this practice so I will recommend an example of Multisim. Go to the File menu >> Open Samples ... Navigate to the folder Educational Sample Circuits>> Digital Circuits and open the file UpDwnCounter . This is a counter circuit in which we see the use of VCC and GND:

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Experiment VCC and GND deleting and changing the configuration of Mixed-Mode Simulation, what is the result? Do you see the difference?

I welcome your comments,

Fernando

Wednesday, August 25, 2010

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Calculating the power dissipated in a resistor

This week I am presenting the new p OAR fan Multisim in English on facebook premiere and put a little challenge to anyone interested in circuit analysis.

Since resistive circuit in the figure below, what would be the power dissipated in the resistor R4 ?

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There are several ways to do this calculation, we use the circuit theory.

us simplify the circuit using series-parallel reductions:

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now have a current divider circuit easier. We can find the current flowing through the resistor of 4 ohms using the formula:

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Note that these 8 A are the current flow through resistor R2
original circuit, so that we can divide the current between the resistors R3 and R4 :

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finally dissipated power
R4 is:

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Now in Multisim in English can do this c ALCULATION faster using the wattmeter as follows:


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Running Multisim simulation would result in
Wattmeter :


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which agrees with the result previously calculated.

Another method to calculate the dissipated power would place a static probe in Multisim to measure the current in R4 , and from there use the f ormulate for the calculation of power.

Until next time!

Fernando

Wednesday, August 18, 2010

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The Multisim database has a special family which contains a 3D representation of several key components (eg capacitors, resistors, transistors)

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These components are ideal for people who are entering the field of electronics and circuit simulation in Multisim. Is an effective way to learn the difference between a schematic represented by symbols and the actual circuit design.

to place these components in Multisim in English go to the menu Place >> Select Component ... Master Database, the Basic Group and Family 3D_VIRTUAL .

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To open an interesting example of the use of these components in Multisim go to the File menu >> Open Examples ... Open the folder Educational Circuits Sample and then Miscellaneous subfolder. Double click on the file 3Dparts2 . This example is a decade counter that uses several components in 3D. Run the simulation to see the behavior of the circuit.


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As we can see, Multisim has components for all tastes and user experience.
Until next time.

Fernando

Thursday, August 5, 2010

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Multisim 3D Components 3D view

One of the features that I like in Multisim Educational and Student version is the 3D view of the breadboard:

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basically a replica of a real protobard often used when we are making prototypes of circuits. The interesting of this view is that we can place the circuit components and wire them as we would in the real breadboard. We can even automatically perform a review of the connections to make sure everything is correct.

This 3D view of the breadboard in Multisim we can use in a report, or simply help to practice wiring components without having to go to laboratory.

Where do we find this 3D view in Multisim in English? directly in the menu Tools>> Show Breadboard :


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Once we are in this view we see the breadboard and the bottom circuit components. We just have to take those components and put them in the breadboard. Then the mouse pointer closer to the holes we put wires proboard:


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breadboard components and can be rotated, you can change the color of the cables, zoom, etc. It's all about to get to play around with this tool.

Greetings!

Fernando