Questions tagged [multisim]

A SPICE simulation and schematic capture package distributed by National Instruments.

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25 views

Implementing a counter using multisim

There was an assignment as follows: implement a counter which gets as an input of 8 pulses, 5 volts each, with frequency of 40K Hz, without using counter block, or any IC components. In the output ...
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1answer
37 views

Why does the phase difference change after swapping elements that are in series?

I am trying to figure out how to correctly measure the phase difference of a circuit's different currents using multisim. After trying several examples, I noticed that spawpping the position of two in ...
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55 views

Simulation circuit program open source

I need to perform circuit simulations and from what I have been able to see the programs that are most used for this practice are Proteus and Multisim. But such programs are not open source. I have ...
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1answer
38 views

Multisim does not simulate the capacitor charge correctly

If I simulate this circuit in Multisim everything works fine, but in reality the LEDs burn, if I put a 1k resistor in series with the capacitor the LEDs no longer burn I think the LEDs are burned by ...
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25 views

Designing a counter up using JK flip flop (odd numbers)

I'm designing a simple JK flip flop counter up with this pattern: 0-1-3-5-7-9-0. I already a did a multisim and it works fine. But when I change the JK FF to real IC (7473), it won't work. What is ...
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32 views

How do I add dielectric Breakdown Voltage of air in Multisim?

For my simulation, I need to add a component that represents air with dielectric breakdown voltage of 1 kV. How do I do that?
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23 views

Convert AC to DC using Phase Shift Oscillator

from what I know, we can convert DC to AC by using Phase Shift Oscillators. I'm able to pull off the manual calculations, but as for simulation on Multisim 14.2, I didn't get the desired graph(phase ...
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40 views

Oscillator in Multisim [duplicate]

newbie here. As I read through webpages, i got to know that Oscillators are capable of changing DC to AC. I made a phase shift circuit in Multisim, but I got no idea what should I do next. I was ...
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22 views

How to find potential difference of a open circuit in Multisim?

I managed to calculate manually. But as for simulation in Multisim, how do I determine or simulate the Vi, Vo in MULTISIM
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1answer
56 views

Noisy output on active bandpass filter PCB Design

I'm trying to design a 40dB active bandpass filter with a centre frequency of 130KHz and a passband of 80KHz. I don't really know much about filter design so I used the TI filter design tool to design ...
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1answer
53 views

Exponential circuits

Is there any way to generate the following exponential outputs in oscilloscope of multisim?
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1answer
96 views

Exponential circuit in Multisim

I have a circuit which has an exponential function as shown in the figure. I tried to put an anti-log opamp with the diode and BJT transistor, but did not get what I wanted. I think the whole problem ...
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13 views

AC magnitude sweep in modelsim run error

I am trying to perform an AC magnitude sweep at a fixed frequency in NI modelsim. Using the Parameter Sweep section of Analyses and Simulation menu. But it gives the error " there are no valid output ...
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26 views

Input Impedance of BJT CE Configuration different from Multisim simulation

So as I derived, my input impedance should be Rb||rπ. But by substituting the value I obtain via the AC analysis from Multsim, I got different values. Tried a few times but still, the input impedance ...
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2answers
61 views

BJT Transistor Simulation at Multisim: Why is Ie not equal to Ib+Ic?

I used current probes and Single Frequency AC Analysis(where Frequency=Freuqency of the AC Voltage Source), but the Ie, Ib, Ic show that Ie is not equal to Ib, Ic? Hope someone can clarify :)
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1answer
33 views

Time step Error In Multisim Using 555 timer

I am trying to simulate a circuit in multisim and I keep running into the following error. (new to multisim) I attached a picture of the circuit and error. Any advice on how to fix this? The purpose ...
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2answers
41 views

Simulate input resistance

I am quite new to electronic engineering. I have a circuit and I have calculated the input resistance to be about 0.65 kOhm. To verify the calculation I would like to simulate the circuit. Is there a ...
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2answers
104 views

I'm trying to learn how to make these circuits but have no clue if I'm on the right track? [closed]

I've recently been doing some online tasks but I am really struggling to understand how build this circuit in multisim. I am also struggling to calculate the values listed in 2. and have tried to find ...
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0answers
39 views

Calculations for 3-phase circuit in multisim

I have homework exercise which is looks like, and I'm trying recreate situation in multisim. Is my approach is good - are values of elements are proper? After calculations I will end with some exact ...
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1answer
164 views

How to design over voltage protection Crowbar Circuit?

I'm designing a Crowbar over voltage protection circuit with following specifications, Maximum input voltage - 30V Maximum input current - 5A Output voltage - 5V Output current - 5A So I have ...
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2answers
196 views

Digital Alarm Clock in Multisim. (Home Work/ Final)

I apologize for the schematic. I know it is not the prettiest to look at. My clock runs slow. I know this is because of my 555 timer. I was off somewhere in my calculations and ended up with a 70hz ...
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30 views

Multisim opamp output oscillates for DC volt if it reaches saturation

Am trying to learn op-amps using Multisim. In the simulation I set initial condition to zero and set the circuit so the output reaches saturation point but instead its ringing with frequency 374HZ. I ...
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2answers
66 views

Trouble getting measurments of my circuit

I'm trying to turn the first image in a multisim circuit but i can't get the right measurements. I have tried a vcc power source but i still can't get the right result in the oscilometer can anyone ...
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1answer
179 views

Buck converter simulation in orcad

I am trying to simulate a Buck-converter circuit in Orcad, but no matter what I change the input voltage to I still get the same output voltage result. I tried this in Multisim and got the same issue. ...
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2answers
1k views

Can't get 5V 3A DC constant

Here's the circuit I am trying to build. I want to get 5V 3A DC output but it's giving above 7V and 4A. I have checked it in the multimeter attached in the diagram. Can any one explain what's ...
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1answer
152 views

Finding Wilson Current Mirror Output impedance

I am trying to confirm my output resistance calculations with my simulation. How can I measure the output resistance seen by Q4 in order to confirm my calculations? How I measured \$r_{o2}\$ (image ...
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1answer
106 views

What should be the Winding at Primary and Secondary in Transformer?

I am trying to build this circuit and testing it in Multisim. As you can See this circuit Produces between 12V-14VDC with 10A but the transformer used in this, I am not been able to get it's Primary ...
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1answer
47 views

phase of current relative to voltage using a single resistor

I am trying to simulate on Multisim the phase of current relative to voltage using a single 1k resistor. However I can't understand how can I do that. In this example the oscilloscope shows me ...
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1answer
55 views

Can I do this in Multisim?

Here is sequential circuit I want to simulate in Multisim: Pay attention to AND gates which I labeled with red numbers. Inputs to first gate are X and Q1, to second X and Q2 and to third X and ...
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1answer
26 views

Multisim: How to generate a sweep frequency?

is there a way to generate a sweep of square wave frequency in multisim? I'm trying to test a device but I'd need the speed to increase from 100hz to 1 khz
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1answer
130 views

Why Deliyannis bandpass filter with high Q does not have the expected transfer function bode plot

What i need is to design a delyiannis band-pass filter with Q enhancement technique. The theoretical analysis of this technique is referred here in pages 107-112. For those who don't know how to ...
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1answer
196 views

How to set fixed bias on transistor 2N2222 for certain specifications?

I'd like to ask how to set fixed bias for this transistor.. It doesn't seem to be working. If anyone know how to calculate it, please tell me. I wanna adjust two resistor values so that Uce = 5,44V, ...
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1answer
132 views

NPN Transistor 2N2222 fixed bias MULTISIM

I have been working on my school projects and I wanted to ask you if there is any way of editing BETA for transistor. When I click on transistor, Edit Model is not working. Anyone help me, please.. I ...
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56 views

Multisim Transient time point did not converge (peak detector circuit)

I'm building a peak detector circuit with mcp6002 op amp. The signal is 8k Hz 20%dc square wave filtered through a low pass filter whose capacitor varies between about 10pf to 1000pf. The schematic is ...
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1answer
160 views

How does this BJT affect the circuit? If it does, how should I simulate on Circuitlab to see the effect?

I am trying to understand how NPN Q23 in the picture below affects the operation of the left circuit. If it doesn't then what we get is the circuit on the right with the only transistor now being Q30....
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1answer
315 views

How can I use the component CD4538 or a 555 timer on Multisim?

How can I use the component CD4538 or a 555 timer on Multisim for a delay of 1 second ? I want both of the nor gates to be 1 for roughly 1 second when the output of the op-amps is either 01 or 10.
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1answer
303 views

FM Transmitter (Modulator) Circuit Simulation Problem [duplicate]

I've asked my question before, and I am writing this new question with some edits based on my previous problem. I am building a small FM Modulator ( Transmitting ) simulation on (Multisim). I've used ...
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1answer
76 views

Inconsistency in a simulation using Multisim

After simulating the following circuit in Multisim : I got these timing diagrams (1 ms/Div and 5 V/Div) : I think that the output Q is inconsistent , shouldn't it look like this instead ? :
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32 views

How can we generate a specific (non periodic) digital signal in Multisim?

Could someone please tell me how to generate a specific digital signal in Multisim ,other than the ones provided by the function generator , like this one for example : I've tried to use the word ...
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0answers
51 views

How to stop summing counter at exact value?

I want to stop summing counter at 25 decimal or 19(hex output) value while it's begin summing from 1 to 31(1F in hex).So how can I make it ?
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2answers
104 views

How to find the schematic diagram of a component in Multisim?

Could someone please tell me how to find the schematic diagram of a given conponent in Multisim, I've been trying to understand how does the IC 74LS729 (SR latch) work but coudn't succeed mostly ...
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1answer
704 views

FM Transmitter Circuit (range 3 km) on Multisim

I am new to the telecom simulations system specially multisim, which I am having a project that I want to simulate. My project in (Analog Communications) is consisting to have FM Transmitter (...
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3answers
1k views

How to calculate the transfer function?

I have The following circuit network (link to multisim) and i am asked to find the transfer function, the max and min value, the cutoff frequency, angle and the type of the filter. [the actual ...
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1answer
61 views

Hello, this is not my circuit. but I'm playing with it, and I have some questions

hello. First, this is not my circuit. Second, I'm newbie student. I just started studying electronic circuit two weeks ago. I'm just playing with this Circuit. just poking around.. I have some ...
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3answers
593 views

This is not my circuit, but anyway, What are they?

Hello. This is not my circuit, but I found it on Google. I'm just a newbie student, so I have two questions. Please, help me. (I started studying electronic circuit last week) 1) The meaning of ...
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1answer
58 views

How to simulate a component hspice model in multisim

I'm trying to simulate TS5A22364 and they have hspice and ibis models, and CAD model .bxl in Multisim. Is it possible? I have tried to add the package model but I don't know how to add the .bxl model ...
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1answer
138 views

Multisim - How to create a 2-pin red/green LED in one part

I would like to pass the output of an LT1413CN8 op-amp through a 2-pin red/green LED (looks white when off) and back to it's inverted input. In Multisim, there is a red/green LED option but that is ...
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1answer
150 views

PWM Comparator types for Class D

I've started simulating a Class D amp, but it seems the MAX999 (I saw recommended elsewhere on this site) isn't working. Could anyone point me in the direction of why? I swapped in an LM311 which ...
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2answers
100 views

Why is this capacitive circuit not working in both multisim and LTspice

The voltage at the top most node of this circuit should be the average of the input voltages. Vtop*CT = C1*V1 +C2*V2 +C3*V3 where CT = C1+C2+C3 I get 0V instead. UPDATE Thanks for the help. I ...
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2answers
109 views

Why does my counter doesnt do my desired sequence? [closed]

Hey there guys i have to built up a counter with the following sequence : 1-2-5-6-7-8-11-12-15, my Multisim schematics works like a charm, but when i'm about to build it on my breadboard it doesn't ...