Questions tagged [multisim]

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

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38 views

Why is a Hartley oscillator circuit giving a DC output in Multisim simulation?

When I usea specific value for my Hartly oscillator tank circuit, the output shows the DC input signal instead of a sinusoidal signal. It shows a sinusoidal signal with other values, so what's the ...
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21 views

How to simulate a push-pull line in a power management IC (PMIC)?

Given a power management IC (PMIC, datasheet), two lines are internally connected to the same low-dropout regulator (LDO). One line is directly connected to the LDO, the other is a push-pull pulled ...
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40 views

How to simulate LVT BiCMOS PSpice models?

I'd like to simulate the digital 74LVTxx chips with their analog characteristics. Packages like Multisim and OrCad only have the basic models (e.g. 74LS04N). ...
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36 views

Voltage gain, input/output impedance using multisim.. How? [closed]

This is the picture of my amplifier circuit using multisim... But I'm not very familiar with this software and thus... how do I do the AC analysis to get the voltage gain, input/output impedance...?
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52 views

How does this optocoupled smoke sensor circuit work? [closed]

This is an optocoupler module consisting of an infrared LED coupled to a phototransistor as smoke sensor. I got this circuit from this site. According to T.K. Hareendran says: For optimum ...
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4answers
479 views

How can I verify the max power theorem in a buffer opamp?

I was thinking since the buffer makes the output follow the input the power should be the same in a buffer opamp circuit and a resistive load. There is the next circuit (the expected power was .5W, ...
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1answer
16 views

Troubleshooting 74LS136D in Multisim

Hello. I couldn't seem to get my U1A to work. I understand the open collector logic gates, like 74LS136, require a pull-up resister in its output terminal. An open collector needs to be powered-on. I ...
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1answer
71 views

Difference between simulator and my analysis

I have this circuit: I have done circuit analysis and found the total current to be 21mA. Here is what I have done: But when I run the same circuit in multisim it shows me 20.6mA.What could it be?Am ...
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43 views

integrator outputing velocity

I'm trying to make a integrator output the velocity receiving an accelerometer signal based on the next design But the output seems to be fixed on a certain level as showed here I'm thinking the ...
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Replecating Multisim simulation in Altium simulation set up and probset up issues

For uni we were asked to get familiar with NI multisim and after having a look at the website, I got to wondering if I could achieve the same simulations in Altium. So I recreated a circuit that was ...
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Multisim tags for easy use

How do I add a tag like this in Multisim so it's very convenient to copy-paste it
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84 views

Why am I getting this annoying problem in Multisim?

I'm using the "edit model" button under the "value" tab of various components in Multisim. Some of the components give me a nice tabulated view of the components characteristics ...
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How to do high frequency simulations in simulation softwares (proteus, multisim, etc)

So i am trying to build a buck converter which requires switching at high frequencies. Before making the whole circuit however, i decided to use a circuit simulation software so that i can experiment ...
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48 views

Am I doing something wrong or is there something wrong in this PMOS SPICE model?

I am trying to create a PMOS in Multisim based on a SPICE model. The component itself is a DMC2400UV-7 from Diodes Incorporated (MOSFET N/P-channel array for 20V.) The NMOS simulation didn't give me ...
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28 views

The steps on storing in a 2K8RAM

I can't seem to get it to work the aim is to input a certain number in a1_add a2, and 3 the steps I followed are set cs to high the select an address and setting to high the setting we to high to ...
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39 views

Multisim Multimeter showing blank reading (--------)

I am trying to build a simple circuit to back up some hand calculations that I am completing for a project. However I am unable to get a reading on the Multisim multimeter. I have changed the ...
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Multisim (2008) - How do I provide a reset stimulus using a controlled one shot pulse, in order to properly initialize my design under simulation?

Apologies for the captured image quality but I have a circuit from a communications textbook Fundamentals of Electronic Communication Systems 3rd Edition, by Louis E. Frenzel Jr. The image below ...
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How can I construct 2:4 Decoder circuit with the help of IC74139 (74xx139)

This is the Truth Table for IC74139 (74xx139) that 2:4 Decoder: I just know to construct 1:4 decoder only. And when I build my circuit, it cannot meet the accuracy of that truth table... Can you help ...
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2answers
77 views

Multisim RMS value

I am trying to measure RMS value of full wave rectifier but I don't know why, I see two different RMS value. See the image below According to voltage prob, RMS value is 3.25V and according to ...
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1answer
210 views

LM565/NE565 Spice modeling in Orcad PsPice/Proteus/Multisim

"Q: Display the outputs specified in the following figures in the simulation software and the results. That's it." I have trouble getting the answer from this circuit. When I realized that ...
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21 views

Simulation in Multisim is taking a lot of time. Probably due to the signal multiplier(Modulator)

In this AM modulator/demodulator circuit, I am trying to see the variations of output signal due to changes of frequency and phase of the carrier signal at the demodulator. All is working fine until ...
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33 views

How to generate a random signal in multisim 14.1

I'm trying to design a circuit which digitised a very noisy input. It is normally +/- 1mv but will randomly peak up to +/- 20mv, the frequency of interest is 0.1<hz<10 but the signal contains ...
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1answer
71 views

Why does my SPICE simulation have a different lambda value from my model files lambda value?

I'm currently running a few labs here on my own since my university cannot do them in person and I have a SPICE model file in which the lambda value is set for a transistor. When I run a DC sweep on ...
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1answer
36 views

Using an NMOS as a switch for a 10V DC source in a 555 timer circuit

I used NI multisim and created a circuit with a 555 timer that will allow a diode to flash at a frequency of about 4HZ. This is the circuit: As you can see in the above image, the oscilloscope graph ...
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45 views

Multisim : Wrong Output for 1 way traffic light using 555 timers

I made a curcuit using the given diagram in Multisim but my output is of the order Green->Yellow->Green->(Yellow and Red) . Pls tell what should I do to get the output of the order Green->...
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1answer
133 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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36 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
55 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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116 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
63 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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2answers
68 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
26 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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101 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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397 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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64 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
45 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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35 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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211 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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81 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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31 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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93 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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233 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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189 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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107 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
79 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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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
68 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
75 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
51 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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