Questions tagged [multisim]

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

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12 views

Pre-amplifier for speaker

I am currently working on a school project which involves building an audio amplifier. Right now I am at the pre-amplifier stage and when i tried simulating it in multisim, the output seems to be ...
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35 views

Trying to create a 555 timer but nothing shows up in my transient analysis

I'm trying to learn more about 555 timers but my transient analysis renders me this empty graph. Is there something wrong with the way I am setting up my MultiSim Circuit?
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1answer
49 views

Trying to design a single op-amp oscillator

I am trying to build this single op-amp oscillator in Multisim but I keep getting this flat transient analysis. Is this what I am supposed to get? Am I using the wrong op-amp?
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38 views

Why doesn't this 950 MHz to 2200 MHz Colpitts VCO circuit work in Multisim?

I found a 950 MHz to 2200 MHz Colpitts VCO circuit from this web page. I tried to design it in Multisim, but doesn't produce any signals. Why? I used BB130 diodes instead of SMV1232 because Multisim ...
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1answer
34 views

MOC3043 on Multisim

I've been looking to simulate an optocoupler-triac driver for an AC Load in Multisim but I can't find a working model for a light emitting optocoupler specifically(the MOC-30XX family). I would really ...
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65 views

What is the role of the Op-Amp integrator in this circuit?

Helo dier community! I got a 400 Hz broken Power Inverter and reverse-engineered the circuit just for the simplicity of repairing it. Then I got deeper in and started to understand the engineering ...
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1answer
21 views

Abnormal voltage drop across n-mosfet in multisim

been playing around with multisim, and i've added in a custom fet from infineon as an example and i noticed something a tad off. when the Vds in my sim is higher than 12.5, it seems like the voltage ...
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30 views

Can we import Multisim and Proteus schematic files in Autodesk Eagle?

I used to simulate my schematics on Proteus and Multisim. But, now I am using Eagle. Is there any way I can open and edit my old Multisim and Proteus files in Eagle?
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1answer
45 views

How to use phototransistor in Multisim?

I've multisim 14.2. I not succeeded in make a phototransistor or photodiode to work. I've tried a circuit like this But no way to work. Any clues? I don't know how to do it. Thanks a lot.
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2answers
325 views

Voltage in an inductor - DC circuit

I have done a simulation of a simple circuit using Multisim software to simulate the behaviour of the coil in DC circuit. The behaviour of the coil in DC circuit is shown by the below picture: ...
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18 views

Is it possible to convert/copy/transfer my MULTISIM circuit into LTspice file?

Hello, By any chance, if is there a way to convert/copy/transfer my MULTISIM circuit into LTspice. Would appreciate a lot your responses Thank you
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1answer
34 views

Did I interpret these multisim results correctly?

From the circuit above, this is what I have to do: " Connect the circuit with R3 equal to 470 kΩ. Set the input frequency to 100 Hz. Adjust the signal level to get an output of 5 Vp-p. Record ...
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26 views

Multisim Mathematical Equation for AC Sweep Analysis

I am trying to create a simple bode plot from an AC analysis sweep in Multisim. As shown in the picture, I have my voltage V(PR2), and I have created an expression for 20*log(V(PR2)). However, this ...
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1answer
119 views

Simulation isn't working for high voltage amplifier

Been trying to simulate on multisim a circuit I saw about high voltage amplifier: The input is 8 Vp-p and 100Hz and reached to output of 1800 Vp-p and 100Hz. The publisher mentioned he used the ...
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52 views

Need help with simulating a 3-channel LED color organ in MULTISIM

I have been trying to simulate a LED colour organ in MULTISIM (literally) for hours. I don't understand why is it not working. My end goal is to get to simulate this on MULTISIM. Here's the circuit I'...
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24 views

Trnsient simulation in multisim is a flat line, osciloscope shows good results

I'm trying to plot results of simulation of a simple Phase shift Oscillator. The plot looks ok in oscilloscope with an interactive simulation, but when I'm running Transient or AC Sweep, I'm just ...
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3answers
74 views

Can electric circuit simulation software simulate capacitor charging process

I would like to simulate process of capacitor charging. Basically I would like to see current drop as capacitor gets charged. I used multisim.com. Here is me circuit. Unfortunately, it only shows ...
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2answers
66 views

Using Multisim to Measure Thevenin Resistance

Using probes, it is easy to find the Thevenin voltage, and Norton Current of a circuit. We could simply divide Vth / In = Rth, but is there a way to find Rth through a simulation?
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81 views

Why is Multisim showing an error for my LED circuit?

The components that I can use in this project are: 555 IC two 100 nF capacitors 9 LEDs one BC547BP NPN transistor four resistors - two 1.6 kΩ, one 1kΩ, one 100 Ω I use Multisim to simulate this ...
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1answer
30 views

the output in buck converter multi sim 14 is too low

it is required to use UC3842 to make a Buck converter that has 68V input and 29 output. i did the calculations for the buck circuit however not for the UC3842. i dont know how to calculate it. i been ...
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1answer
48 views

Why does this high pass filter behaves like band-pass filter on Multisim AC Sweep simulations?

I have this high-pass filter schematic and its AC Sweep simulation. Until the break through the end, the graph is right but I can't see why the graph breaks on the right hand side and filter behaves ...
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30 views

simulation of this task

Try to make simulation of this task with program of your chose. Can someone please do this simulation with a program like Multisim and upload the simulation,because i dont have the program.
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2answers
315 views

How to convert 8 bit binary to BCD using logical gates on multisim?

I have a task to convert analogue signal to digital on multisim. But multisim have no Ic to convert 8 bit binary to BCD. Now I have to make logic circuits to convert 8 bit binary to bcd. I have used ...
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1answer
33 views

On measuring the common mode gain of an op-amp using a simulator?

I have been trying for a while now to measure the common voltage gain of the LM741, which according to Op Amps: Design, Application, and Troubleshooting page 21 is around 6, using Multsim and Orcad. ...
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1answer
49 views

How to transition multiple down counters using 74ls193 in a 'one at a time' sequence

I've been messing with this circuit but i'm struggling to find the solution i'm looking for? Trying to create a sequence of down counter, so when the first completes the next starts and so on until ...
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1answer
34 views

Simulate Step down chopper circuit using any Electrical Engineering software

Here's my attempt: Could someone tell me where is my mistake ? Or simulate answer the question using any other software,please ?
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1answer
85 views

Multisim vs LTspice : Different Result

I was using the simple darlington circuit below as the test circuit. DC operating point analysis was run on both LTspice and Multisim, with V2 as the manipulating variable and the base voltage of Q2 ...
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41 views

Op-amp power supply driver problem (multisim), LM2679 simple switcher

The simulation works OK when I run with ideal op-amp but the problem comes whenever I change the op-amp to a real one (LMH6642MF) and that results in a converge error and a warning. I have tried to ...
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1answer
39 views

Simulate the audio amplifier using the circuit shown

Okay so I've done the exact same thing in Multisim but I don't know how to find the voltage again. I tried to place the multimeter in the audio (where I have placed the multimeter) but the values vary ...
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2answers
113 views

How does this audio power amplifier circuit work?

How do I simulate an audio amplifier in Multisim? I'm required to search for audio power amplifier circuit and explain how it works in details so I need to know the detailed process of this circuit ...
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1answer
68 views

Why is the oscilloscope in Multisim software showing more voltage than the source?

The Multisim oscilloscope shows around 13V peak despite the voltage source being 12V peak. I was expecting 12V. The diode voltage drop is set to 0.1v when forward biased. Am I missing something?
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1answer
33 views

How to shift the register while using SIPO shift register?

I have used this SIPO shift register and I've displayed the pattern that I wanted which is 01011000 but I don't know how to shift it now? How can I make the LEDs move? I've been told to insert a load ...
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2answers
95 views

Active clipper terrible performance

I need a clipper for a 10 kHz signal to protect an ADC from possible overvoltage. I'm using the usual active circuit (simulation is in multisim): Unfortunately the result is very bad, the opamp is ...
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1answer
47 views

CMOS astable circuit

I have made the following astable circuit in Multisim: However, it didn't work (oscilloscope reads 0V as an output.) I think the problem is because of VDD and GND pins which are hidden in Multisim. ...
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2answers
49 views

How do I drive this circuit when the amplifier's input is grounded?

I'm building this circuit in Multisim. The amplifier's input is grounded, but I'm supposed to see that the output is not zero because of an input offset error. I'm clearly missing something since I ...
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1answer
74 views

Multisim - Circuit Design with a 555-timer

I am currently working on a design project. I am trying to get my 555-timer to turn on (1-minute) a motor and LED when activated and then turn back off after the 1-minute has passed. I am taking the ...
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1answer
39 views

Unable to get instrumentation amplifier to work correctly

I have built an instrumentation amplifier using an LM348N quad op amp, supplied with ±9V. A simulation of the circuit is done as in the link - Simulation: But when I connect the circuit accordingly, ...
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1answer
34 views

Multisim Circuit with Virtual Crystal and TTL gates

I have to make the following circuit in Multisim: This is what I have done: As you can see, the output (in points ~Q and Q) is 0V and I can't figure out why. Could anybody help me?
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2answers
65 views

Input/output impedance of devices in a circuit simulator

I have to use a circuit simulator (I'm using Proteus, but can also use Multisim if necessary), to construct and analyse a passive RC filter. The general circuit is shown below: I need to connect ...
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2answers
86 views

Voltage protection with 555 timer not working

Briefing I am using Multisim to simulate a circuit before building it. The voltage protection circuit with a regulator works fine and the timer circuit works fine as well separately. When I try ...
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0answers
54 views

Are there any instruments that can be used to measure the stored energy across a capacitor?

Apologies if this a noob question but I was wondering if there was a way I could directly measure the energy across a capacitor in Multisim so that I can compare it with my analytical result.
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1answer
39 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
43 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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1answer
142 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
59 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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50 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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1answer
35 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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28 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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47 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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