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Questions tagged [multisim]

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

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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....
Geo's user avatar
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1 answer
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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, ...
tea's user avatar
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3 answers
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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 ...
Reddevil's user avatar
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2 answers
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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 ...
Physco111's user avatar
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1 answer
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Questions on Multi-stage transistor Op-Amp [closed]

I would like to know how to understand/analyse the circuit below. And sorry but my level in electronics is not that high and I could only tell that the opposing transistors on the left are meant to ...
carlos's user avatar
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2 answers
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Problem with Wien's Bridge basic working and simulation in multisim

I am very new to the concept of Wien's bridge and am trying to make a basic circuit of it but didnt get the expected output (noise only).Tried to simulate on Multisim but got the same output.I have ...
akki's user avatar
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1 answer
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How do I simulate an audio amplifier in Multisim?

I'm new to Multisim and am using the 12.0 PowerPro version. I have designed the circuit in the question TDA2002 Audio Amplifier using Multisim: The Multisim circuit may be found here. Instead of a ...
quwuwuza's user avatar
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3 votes
1 answer
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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 ...
Junius's user avatar
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2 votes
2 answers
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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 ...
Intent Filters's user avatar
2 votes
2 answers
269 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). ...
Drakes's user avatar
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1 answer
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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 ...
dbradley's user avatar
2 votes
4 answers
548 views

Inverting Op Amp: Why does current flowing into output seem to magically reappear at ground?

I'm trying to understand the flow of current through the inverting op-amp circuit. I've created a simulation: The thing that is baffling me is: How come the values of PR1 (op-amp output) and PR2 (...
Hassaan's user avatar
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1 answer
2k views

Wrong MOSFET transistor model? MultiSim

I am designing a circuit that switches between 2 power supplies, controlled by a MCU. The circuit is the following. This is for a simple supply line, so it will be duplicated for both PS. As you ...
jaym's user avatar
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1 vote
1 answer
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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 cut off when the output of the ...
Intent Filters's user avatar
1 vote
3 answers
1k views

Unexpected behavior of the Sallen-Key second order filter

I met an unexpected behavior when I simulated under Multisim (National Instruments) the Sallen-Key circuit given on the image below. The circuit is designed to receive a 1.8kHz modulated sin wave as ...
eldala07's user avatar
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1k 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. ...
Hilbert's user avatar
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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 (...
B Happy's user avatar