Questions tagged [multisim]

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

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2answers
60 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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0answers
22 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. ...
3
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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
60 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
79 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
38 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
50 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
23 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
51 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
94 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
57 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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0answers
35 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
116 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
132 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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0answers
18 views

How to create a component with a specified characteristic in Multisim?

I am a physics student, 4th year. I would like to ask You about creating a component with a non-linear characteristic (specified characteristic) in Muptisim programm. So, I want to create a thermistor ...
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1answer
217 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
40 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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0answers
25 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
47 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
44 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 ...
0
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1answer
358 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
461 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 ...
-4
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1answer
59 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
588 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
42 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
74 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
84 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
62 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
101 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 ...
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0answers
94 views

Toroidal core saturable 3 winding transformer in multisim

I am simulating a circuit of electronic ballast. It uses a self oscillating half bridge inverter through saturable transformer. I simulated the circuit on multisim but I am getting a constant DC ...
2
votes
2answers
108 views

Band Pass Filter for musical note separation

I have a school project that i need to separate musical notes with filters at least i thought that i can do it with band pass filter, here are the results These are the resistor and capacitor values ...
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1answer
95 views

Presence of 555 square wave generator breaks the rest of the circuit even when not connected.

I have a pretty bizarre problem with Multisim. I have a larger circuit which works perfectly when the inbuilt square wave generator for Multsim is used. I wish to replace the square wave generator ...
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3answers
184 views

How to trigger a pulse until a capacitor fully discharges based on the output of a comparator

In my circuit I have a comparator which compares the output of a sine wave with a staircase wave, if the staircase is above the sine wave, I wish to use a Mosfet in its cut off mode which will allow ...
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1answer
110 views

Using a Mosfet correctly as a switch in this circuit and how to prevent it from “loading”? the circuit

I have a staircase generator circuit with a Mosfet connected to capacitor 2. The input of the capacitor is connected to a comparator and I wish for the Mosfet to cutoff when the output of the ...
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2answers
237 views

How to DC bias the output of a Wien Bridge oscillator so that it oscillates about 2V?

I was wondering what a practical method of biasing the output would be so that it osicllates around 2V? I tried connecting an DC voltage source in parallel to the positive terminal but alas the output ...
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0answers
45 views

Wien Bridge Oscillator in Multsim Values

I am trying to build a Wien Bridge Oscillator in Multisim that has a frequency of 3.6 kHz. However my graph is very distorted and I'm guessing its because of the op amp component values. Does anyone ...
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1answer
40 views

How can I find an OPamp, or any other component, that has the required properties when using simulation software like multisim

Hi I am require an OPamp that has a slew rate of 1Meg a open loop gain of 100k and a GBW of 1 Meg for a circuit simulation on multisim. I was wondering if there was a way to search for a component by ...
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2answers
204 views

Sinewave generator using RC oscillator help

im trying to build a sinewave generator using an RC oscillator with https://www.electronics-tutorials.ws/oscillator/rc_oscillator.html as a guide. i've done what the guide says like making sure i have ...
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1answer
323 views

BOOST CONVERTER Simulation Problems in Multisim

I am trying to simulate a boost converter to step up the voltage to 70V from a 40V source on the Load resistor. Based on the formula: Vout =Vs(1/1-D), i calculated the duty cycle to be 42.85% however ...
1
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1answer
84 views

Choosing Component Values for DCO Design

This is a sawtooth DCO, the comparator U1A resets the ramp at the desired frequency (thus controlling the frequency), and the voltage V7 applied to integrator U2A determines the rate of change of the ...
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2answers
746 views

1Hz Sine wave oscillator - Multisim

I'm trying to create a 1hz sine wave oscillator. This is my current design: Frequency is given by: f = 1/(2pi*RC) where ...
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1answer
58 views

Waveshaper: Amplitude changing as frequency changes

I have designed a Sawtooth to triangular waveshaper using a precision full wave rectifier.I added C1 to stop clipping and the parallel resistors R7 and R5 to get the triangle's ampitude the same as ...
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1answer
35 views

Multisim issue with current in differential amplifier

I did simple differential amplifier simulation: As you can see Q2 current is negative, it is not possible right? Also, if input signals on both transistor base are equal, u1 (volt metter) should show ...
1
vote
1answer
305 views

What's wrong with this RC Phase Shift Oscillator?

I am trying to design a phase shift oscillator, using a CE Amplifier. I have a Vc of approximately 12V, gain of approximately 250 I aim for an oscillation frequency of 60 Hz. But whenever I start ...
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1answer
357 views

Design on ALU in multisim

I am trying to design a simple 2 bit ALU which can perform addition, OR and XOR. Here's the picture of my design in multisim. Problem with my design is i'm not understanding the purpose of select ...
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1answer
150 views

0 to 2 VDC to 4-20 mA using OP07

I am trying to build a curcuit to convert 0 - 2 VDC to 4-20mA using two OP07.. I have designed the circuit in multisim as in the attached file. I have also developed the circuit on the general ...
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1answer
241 views

Why does this RAM component have unpredictable behavior in Multisim?

Multisim has a 2k8 RAM component that I was playing around with. Here is how it works. Here is what happens when I simulate this. Let's say I save the value 00000011 to address 00000000. Then, I make ...
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1answer
150 views

CE BJT amplifier phase shift

I built simple CE amplifier in Multisim: and make AC analysis, the phase are: What is the reverse near 10 kHz? I make the identical circuit in LTSpice but there is no any equal to Multisim on phase ...
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1answer
222 views

AVCC source usage

I want to understand how the Arbitrary Voltage Controlled Current source (AVCCS) works. In Proteus, when I tried to simulate my circuit, it has some kind of a A,B formula for the source. But when I ...
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1answer
275 views

Generating a cosine wave with multisim

I'm attempting to complete a project using multisim. I have to determine resistor and source values for a differential opamp. One of the specifications is to supply a -10 amplitude cosine wave when ...