Questions tagged [multisim]
A SPICE simulation and schematic capture package distributed by National Instruments.
290
questions
0
votes
1
answer
41
views
Multisim is not giving any voltage value for this simple capacitor circuit
This is the circuit:
Even though I gave 12V it is showing 6V. Maybe it is peak voltage.
Why are the voltages across each capacitor so weird?
- 95
0
votes
2
answers
45
views
I used Multisim to simulate a circuit with an LM358 but it doesn't work. What is the problem?
The input is 1V. The output should be 1V*(1+R2/R1)=2V but the output in Multisim is 742.09mV. What is wrong?
- 1
1
vote
1
answer
96
views
Why is there current through this MOSFET?
This is an N-type enhancement MOSFET, and from what I understand, there should be no source - drain current flowing when there is no voltage applied to the gate.
Why is there current flowing in this ...
- 55
0
votes
1
answer
46
views
How can I apply this Vs(t) = 5cos(2000t) into the multisim circuit?
I found the rms = 3.53
it has 2000t whereas omega,w = 2000
so how can I use it to the AC source
- 95
0
votes
0
answers
45
views
SIMetrix simulation
Determine the true power dissipated in the load of a single-phase half-wave rectifier
fed from a 220 V 50 Hz supply. The load resistor is 37 ohm.
I'm getting an error during simulation on simetrix:-***...
0
votes
2
answers
146
views
Abnormal THD values for Audio Amp in any circumstances
Using Charles Wenzel's "High Gain and Fidelity Audio Amplifier" (source:https://www.radiolocman.com/shem/schematics.html?di=335167) as my final project for my freshman year due this Saturday,...
0
votes
1
answer
51
views
Multism11 differential amplification circuit
When I tried to draw a differential amplification circuit based on a sample picture and connected it to an oscilloscope, I'm getting a flatline on Channel A with a value of 0. What could be the ...
- 1
0
votes
0
answers
90
views
Designing an ADC circuit incorporated into an 8-bit SAR that can convert an analog signal (such as sound from an electret microphone)
My task is to design a ADC incorporated into a system that converts an analog signal such as a sound picked up by a microphone into a digital signal.
I have chosen an electret microphone. I know the ...
0
votes
3
answers
144
views
How can I find the time period for two sine waves using the oscilloscope in Multisim?
The formula for calculating the phase difference requires a time delay and a time period which is given in the formula:
Φ = td/tp × 360
Where ...
- 3
0
votes
1
answer
59
views
Why does my THD-value not converge in simulation of rectifier circuit?
I'm trying to simulate a FWR - circuit with an RC-load. In doing so, I want to analyze the THD-value of the circuit.
In the end, I've tried changing the FFT-points, increasing and decreasing the ...
- 313
0
votes
1
answer
64
views
Why are the absolute output voltages of the two NOR different in my self-built 555 timer?
I tried to build a 555 timer using the Multisim live online (free version).
I refer to the Ben Eater's video which I believe referred to the 555 timer datasheet.
Here is my circuit and the simulation ...
- 1
0
votes
0
answers
25
views
Multisim Component Separation
This is how I created a circuit. How can I remove the R1 resistor from this circuit without breaking the wires as follows. Shortcut or otherwise.
1
vote
1
answer
54
views
Is there somewhere accurate SPICE model for Analog Devices AD5246 I2C adjustable resistor?
Question already in title - is there?
Because I haven't seen official model on Analog.com.
Because I asked AI to create such model for me, and it spit this:
Sure, here's a SPICE model for the AD5246 ...
- 23
1
vote
1
answer
101
views
Multisim simulation of a current division
I'm currently trying to simulate a current division for three transmission lines that are in parallell (but all of different lengths). I want to study how the current divide itself as we progressively ...
- 313
1
vote
1
answer
97
views
Why is the voltage in the resistor different from what is recorded in the oscilloscope and multimeter?
I made a halfwave rectifier circuit in Multisim.
How is it possible that the voltage on the resistor is Vrms (Resistor) = 10.562V while on the oscilloscope the Vpeak = 33.264V?
Isn't the Vpeak on the ...
user336518
1
vote
2
answers
67
views
Inverting op-amp unexpected voltage shift
I'm trying to create an op-amp circuit that attenuates a 5 V input signal down to a 1 VRMS Vout signal (1.414 V Vout).
I need to shift the output signal by 2.5 V so that it can be fed into a unipolar ...
- 13
0
votes
1
answer
101
views
Digital Counter not initializing to 0 or rolling over to 0
I'm trying to make a 3-bit counter using D flip flops that loops through the sequence (0,3,4,5,7) repeatedly.
So far, I've made a timing trace, block diagram, operation table, Karnaugh maps, rough ...
0
votes
1
answer
105
views
Input current on linear power supply
I am working on a new project, and I need to build a big PCB with a lot of circuits integrated. Therefore, I need to make a power supply on the PCB.
Since I am not comfortable with SMPS design, I ...
- 81
0
votes
0
answers
45
views
Why is this happening using Multisim?
I'm using the website https://www.multisim.com/create/
Why does Multisim show the current as negative above the Zener diode?
Both probes are going the same way, yet the current is shown as a negative -...
- 2,008
2
votes
2
answers
174
views
Gain loss in two-stage direct-coupled amplifier
I am designing a direct-coupled two-stage amplifier with the following design constraints.
VCE swings of both BJTs should be the same
2nd stage current (IC2) should be between 10 or 20 times the 1st ...
- 135
1
vote
1
answer
60
views
Version control with MultiSim
I am a beginner with analog electrical circuits. Similar to computer programming and CAD, is it recommended to use version control software when working with MultiSim? Are there circuits complicated ...
- 13
0
votes
0
answers
53
views
Liquid level control using AD620
I am making a liquid level control circuit as follows:
I want to replace AD624 with AD620 is there any way to do so?
0
votes
1
answer
110
views
Using potentiometer to light three different LEDs (Multisim)
I want to make a circuit that connects a potentiometer to three different LEDs (green, blue, red.) This circuit would simulate the wind speed sensor. If the potentiometer is high (V is high, ...
- 1
0
votes
0
answers
80
views
Low voltage to drive LED flash (not successful in simulation, but works on breadboard)
I first did this circuit on a breadboard, except I originally used a light-sensitive resistor, which is around 1 kΩ at daytime and above 160 kΩ in darkness.
It oscillates with LED as capacitor adds up ...
- 71
0
votes
2
answers
77
views
Flat positive sinus when simulating on Multisim
I am a biomedical engineering student and I have a recurring problem on Multisim.
When I try to redo my LTspice circuit I end up with a flat positive sinus. I tried changing the values to see if there ...
0
votes
0
answers
181
views
Combine two circuits in Multisim
I have two circuits, two separate simulations in Multisim, which work fine until I try to combine them.
I tried a common ground, on-page connectors, added the voltage follower, but that didn't help.
...
- 5
1
vote
1
answer
50
views
How come the Thevenin Equation is not being satisfied in this simulation?
i1 = 1A
R1 = 100 Ohm
R2 = 100 Ohm
R3 = 2200 Ohm
R4 = 220 Ohm
R3 and R4 are in parallel.
The first circuit shows that I open circuited at the end to calculate the Voltage across the open circuit ...
- 133
0
votes
1
answer
64
views
Multisim 14.2 issue
Using Multisim 14.2 to simulate a capacitor's charge cycle , I've noted that when the simulation starts for the first time, even if the SPST switch is OFF, the capacitor starts fully charged. Any idea?...
- 359
1
vote
2
answers
144
views
Multisim results not matching handwritten results
I was given a project with the following question:
I calculated the current going through inductor 2 in transformer 2 as 4 phase angle -30.
\$Vs = 1440 V RMS\$
\$V_1 = \frac{1}{3} * V_S = 480 V RMS\$
...
- 41
0
votes
0
answers
87
views
Why is this circuit not triggered (astable multivibrator) although it can be triggered on a breadboard?
Why is this astable multivibrator circuit getting balanced in a flash and not oscillating? It works on a breadboard. It once worked fine in simulation, but one day it stopped oscillating in simulation....
- 71
1
vote
2
answers
146
views
LED works but speaker does not work in multivibration circuit
This circuit oscillates with LED (in multisim 14).
This circuit does not oscillate with speaker (labview, in real breadboard it only beeps twice and becomes silent, playback time 10 s, sample ...
- 71
0
votes
2
answers
59
views
Why do I get a different value for DC output?
I am given the circuit shown below, a full wave rectifier with a filter.
To find the DC output on a full wave rectifier with a filter, I was given the formula:
$$V_{dc}(out) = \frac{V_{M}}{1+\frac{1}{...
- 97
4
votes
1
answer
337
views
Summing RMS values proof [duplicate]
I have a simple circuit with two sources of different frequencies. I was tasked to get a voltage output across a component. I know for a fact that adding the derived voltage of both sources acting ...
- 97
1
vote
2
answers
718
views
Practical integrator using op-amp
I'm trying to simulate a practical integrator using NI Multisim 741 op-amp. But I dont quite understand a variation in my waveform.
I'm applying a 1 kHz, 5 V sinusoidal signal as input to the op-amp. ...
- 141
0
votes
1
answer
68
views
Op-amp linear inverting circuit question
I'm trying to implement a linear inverting circuit using NI Multisim. I'm using a 1 Hz sine wave with a 1 V amplitude as input.
According to my circuit, the gain should be:
$$A_v = \frac{-R_2}{R_1}=-...
- 141
0
votes
0
answers
68
views
Multisim schematic to other CAD
Does anyone knows a way to convert my schematic file in MS14 to any other CAD system? I want to open it with Altium.
- 1
0
votes
1
answer
169
views
Why do I get the wrong phase shift?
I am trying to compare theory vs simulation values and it seems to be that there are differences. I am using Multisim to simulate a RLC circuit, the LC are in parallel and in series to the resistor.
...
- 97
1
vote
1
answer
138
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 ...
- 19
0
votes
0
answers
49
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, ...
0
votes
0
answers
176
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 ...
- 81
1
vote
0
answers
207
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 ...
- 609
0
votes
2
answers
412
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
97
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 ...
- 259
0
votes
2
answers
224
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 ...
- 9
0
votes
0
answers
85
views
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 ...
- 21
1
vote
1
answer
93
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 ...
0
votes
1
answer
118
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 ...
- 13
-1
votes
1
answer
117
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 ...
- 3
-3
votes
1
answer
244
views
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:
- 3
3
votes
3
answers
565
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.
- 214