Questions tagged [multisim]

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

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49 views

Multiplier and divisor using logarithmic and anti-logarithmic op-amps, issue with output

I was tasked to make 4 processes using operational amplifiers: adding, substraction, multiplication, and division. However, only the add and substract operations work: whenever I try to multiplicate ...
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25 views

Issue with a circuit in Multisim V14.0

I have a part of this circuit on a PCB working with a frequency of 1 Hz (I tested it with an oscilloscope; it works perfectly). I have to change it to 2 Hz, so I tried to do that in Multisim V14.0, ...
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81 views

Slow slew-rate compared to the datasheet

I'm trying to create a 10 kHz PWM signal through use of op amps. In the output I'm using a TLV272IP op-amp working as a comparator: Since it has as slew rate of at least 1.8 V/us this should give a ...
1 vote
0 answers
54 views

What is the function of frequency resolution in multisim

In this circuit, noticed if the frequency is set to be the same as source frequency, the display will show a constant peak. The modulation index is 0.6. However, if the resolution frequency is set to ...
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2 answers
125 views

Function generator with an operational amplifier

I am solving a function generator whose frequency of each output is 5kHz. My question is, how can I find the parameters of C3, R5 and R6 to get an output of the same frequency? In addition to the ...
2 votes
0 answers
44 views

How to determine LS, CS, RS, and CO of a piezo transducer for simulation?

I have a 24mm piezo transducer with the marking SSE2425TAL from overseas. There are no detailed specs nor graphs to get LS, CS, RS, and CO at various frequencies (but just 25 kHz is fine). I'd like to ...
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2 answers
123 views

FM transmitter not giving the intended output of 88MHz to 108MHz

I am trying to build an FM transmitter that outputs 88MHz to 108MHz range using Multisim, but the circuit I constructed gives a lower voltage and lower frequency at the output according to the ...
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Trying to Construct Phase Shift Circuit in Multisim

I'm attempting to construct the variable phase shift circuit from this video (link takes you to the circuit diagram of it) within Multisim. As far as I can tell the circuits are identical, and yet my ...
1 vote
1 answer
76 views

Confused about RLC series circuit waveform reading: Please help

Hi everyone, I simulated this simple circuit, but I am a little confused about my voltage readings. I calculated VL1 to be 1.279Vrms or 1.81V-pk, however, on the oscilloscope I'm getting a much ...
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1 answer
88 views

How do you get a Vout of 2.29 in the simulation with a differential opamp and a wheatstone bridge? [closed]

I made a circuit to read the resistance of a PT-1000 (a platinum RTD [Resistance Temperature Detector] of 1 kΩ at 0°C) and I know I messed something up with the linearity; whatever I try, I can not ...
-1 votes
1 answer
85 views

Frequency effect of capacitor on three phase

At recent days, I was studying on load affect of transformers. I realized, capacitor changes frequency of voltage at some conditions. Here the circuit that I used If we run the simulation, we see ...
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-3 votes
1 answer
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Multisim delta-delta connection

I try to simulate a delta-delta transformer connection in Multisim but I get an error, why, I don't know. My diagram is as below: Here are the errors:
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3 votes
3 answers
351 views

Series Parallel batteries

I am trying to simulate a series parallel battery design. When I try to simulate, I am getting this error: Voltage source loop found: V9, V1, V2, V10.
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3 answers
138 views

AND gate working in Multisim circuit but not AND IC 7408

I am a newbie in electronics. I was trying to replicate this traffic control diagram: I recreated the circuit in Multisim using 2 clocks and an AND gate, the 3 LEDs light up: If I replace the AND ...
1 vote
1 answer
100 views

Modelling a real-life diode

I have a final year project for electrical engineering. My part of the project is to design a rectifier that receives an AC voltage from an antenna and provides a power management unit with rectified ...
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-1 votes
1 answer
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Making a 12 hour digital circuit in MULTISIM

I saw a video for building a digital circuit but he uses a different decoder and counter. Can anyone help me understand how these work and give sources to read more about them? the decoder: (...
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1 vote
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51 views

how to calculate rx, ro given gx and go from XSPICE

I have a set of XSPICE data extracted from multisim as can be seen in the attached image. How do I calculate the ro and rx (base spreading resistance) given the parameters go and gx. Thanks
-1 votes
1 answer
108 views

Does Multisim have coaxial cable? What simulation application can I use that has coaxial cable?

I want to use coaxial cable in a simulation. Is it available in Multisim or another simulation program?
1 vote
0 answers
44 views

Improving input impedance at higher frequencies for multi-stage MOSFET amplifier

I am trying to design a three-stage amplifier and I currently have two common source amplifiers and a buffer, to help drive a small 8 ohm load. However, as my frequency increases, my input impedance ...
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0 votes
1 answer
244 views

LM7805 for stable 5V output

For a project I need to make a circuit to produce a stable 5V output. The input range is 5V to 15V. Im using the LM7805 as it seems most logical, but when the input is less than 7V the output drops ...
2 votes
1 answer
349 views

BJT current gain: Relation of SPICE parameter BF to beta

As far as I understand, the BJT (bipolar junction transistor) DC forward current gain in common emitter configuration is given by It seems those symbols all used to describe the same thing (correct ...
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66 views

Secondary Coil Malfunction in an SSTC Circuit

I’ve designed an SSTC circuit which is based on a different topology and I wanted to accomplish it in real life. The circuit is operating at approximately 1.5 MHz during resonance and inherently, the ...
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1 answer
45 views

Multisim component name - voltage level convertor

Just a really quick question. How do I find the circled components on Multisim? This is a locig voltage level convertor circuit. I'm unable to find it anywhere in Multisim search. Could it be that in ...
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1 answer
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How can I generate an exponential signal in simulation software?

In Multisim, I can generate a few signals using the function generator like sine wave, triangular wave, square wave. Can I generate a signal like \$i(t)= 2e^{50t}\$ in Multisim software or any other ...
3 votes
1 answer
93 views

How to determine what kind of response this filter has

I have the next Sallen Key type filter I have determined the transfer function and the coefficients of \$a_{0}\$ and \$a_{1̣̣}\$, based on \$N(s)=\frac{Ka_{0}}{s^{n}+a_{n-1}s^{n-1}+....a_{1}s+a_{0}}\$...
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1 vote
2 answers
163 views

Is a battery a reasonable model for a forward biased diode? Why are the knee voltages different in the below Multisim schematics?

Here are two DC sweeps from Multisim. One ranges from 0 to 15 mA and the other 0 to 50 uA. They are different. What battery voltage should be used to model a silicon diode? Ultimately, my question is: ...
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1 vote
0 answers
92 views

amperes too low on this circuit

I'm trying to get the voltage between phases, the line current and the apparent, real and reactive power of the next circuit: but there are a few things dazzling me, the most important is why the ...
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2 answers
65 views

Failed to get desired output of a pulse width modulation circuit simulation

I was given an assignment to simulate this circuit by first adjusting the variable resistor to get V=0 at the non inverting end of the opamp then observe the waveform at the output. I am getting an AC ...
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0 answers
207 views

How can I measure phase shift in Multisim using Tektronix oscilloscope?

I have to measure the phase shift between input and output of amplifiers. Below is an example circut with voltage charts (yellow is input, blue is output.) How do I measure phase shift between them? I ...
2 votes
2 answers
164 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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-1 votes
1 answer
687 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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-2 votes
1 answer
73 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 ...
3 votes
4 answers
492 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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1 answer
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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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-3 votes
1 answer
77 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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51 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 ...
-1 votes
3 answers
123 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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0 answers
189 views

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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1 answer
150 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 ...
0 votes
1 answer
187 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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1 vote
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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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2 answers
566 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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1 answer
980 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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0 answers
130 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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1 vote
0 answers
89 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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2 votes
1 answer
230 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 ...
1 vote
1 answer
49 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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2 votes
0 answers
144 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->...
2 votes
1 answer
192 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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