Skip to main content

Questions tagged [sinusoidal]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
1 answer
75 views

Oscilloscope Low Sampling at uHz Sinus Signal

I tried to measure a sinus signal at 1000 µHz with my R&S RTC1000 oscilloscope (bandwith 300 MHz). The function generator that I used was the EDU33212A. I set the T/div=100s and the oscilloscope ...
DarkKnight's user avatar
0 votes
3 answers
81 views

Finding the natural frequency from the transfer function magnitude

Studying Steady Sinusoidal State circuits and I have a question regarding RLC circuit. Given that the transfer function for the voltage across the capacitor is given by - $$ H(j\omega) = \frac{1}{R+j\...
Sahar Cohen's user avatar
2 votes
2 answers
206 views

Graph plot of sinusoidal current/voltage vs displacement of speaker membrane from its resting position

For a very long time I believed that the speaker membrane just moves according to the amplitude of a electrical signal fed to it. Like, If at any instant, the current/voltage is at c% (0 <= c <= ...
Cinverse's user avatar
-1 votes
1 answer
44 views

Is it possible to write a sinusoidal steady state response of a RC circuit with diode involved?

Let's consider this circuit. When everything is ideal and the forward voltage of the diode is 0. When the current is going forward, the time constant is R1*C. When reversed, it is (R1//R2)*C. Is it ...
Wenxin Zeng's user avatar
1 vote
1 answer
43 views

Diode directed into the negative terminal of a sinusoidal voltage source

If my V_in is a sinusoidal voltage, what would be the V_out? I tried to plot this in ltspice, however, I ran into trouble on where to connect the ground, on what node should I use to extract V_in and ...
hutao newbiEEE's user avatar
0 votes
2 answers
95 views

What is the negative omega squared in this function?

I'm trying to draw a Bode plot for the transfer function, but I am confused on what the negative omega squared is supposed to be. Is it supposed to be the frequency with no phase angle? How can I get ...
Samuel Sutphin's user avatar
0 votes
1 answer
89 views

Why do resistances disappear when studying variations of the voltage Va?

I'm trying to solve the question 2.2 of this sensor conditioning exercise. In the solution of the exercise, when trying to find Δ va, the teacher made the resistors R, and the continuous voltage ...
Chizu's user avatar
  • 1
0 votes
1 answer
93 views

When can we apply phasor analysis to an \$RLC\$ circuit?

This answer of mine shows that not every \$RLC\$ circuit reaches sinusoidal steady state at input frequency. A well-known theorem states that: If all natural frequencies of a uniquely solvable LTI ...
Sgg8's user avatar
  • 163
1 vote
2 answers
107 views

Why is there a DC component in the output spectrum from an op-amp adder?

I'm experimenting with a DSB-SC circuit using TINA simulation tool. As input I'm using two sinusoids with frequencies of 500 and 1000 Hz, i.e. 0.05sin(2π500t) and 0.1sin(2π1000t) which are guided into ...
Pavlos Papanikolaou's user avatar
0 votes
2 answers
116 views

Sinusoid Amplitude for an Ultrasonic Transducer

I want to design a driver for PKT40A from ThorLabs. The spec sheet indicates "Power (Typical, Instantaneous @ 3 kV)" of 700W, but the "Impedance at Resonant Frequency" of <12 ...
beardeadclown's user avatar
4 votes
1 answer
114 views

A question about the validity of impedance rules

Let’s consider an RLC circuit connected with a sinusoidal source, my goal is to find the current \$I(t)\$, this is done by solving the following differential equation: \$ \frac{{d^2I}}{{dt^2}} + \frac{...
user9276043's user avatar
0 votes
2 answers
436 views

How can I find the steady state of current I with sinusoidal voltage source?

I am reading the book Electric Circuits 10th Edition from Nilsson and Riedel. In page 321 has a problem that seems easy but I find a difficulty to solve it.The problem states: A 90 ohm resistor, a 32 ...
Homer Jay Simpson's user avatar
0 votes
0 answers
33 views

how to implement external sinusoidal commutation using encoder feedback in BLAC motor?

I have a linear permanent magnet synchronous motor with sinusoidal back-EMF and a sinusoidal driver with current operation which takes two reference sine waves with a 120-degree phase difference, ...
Meisam Mehrabi's user avatar
2 votes
2 answers
889 views

How to calculate the average voltage and VRMS of a non sinusoidal waveform [duplicate]

I need to calculate the average voltage and VRMS of this. It's given that Vp=41V, Vn=-6V and T=13ms. I know the answer for the average voltage is 12.8V, but I can't find the formula that gets this ...
Parstoukas's user avatar
0 votes
1 answer
157 views

Can a modified square wave (average square wave in each discrete time interval) be made from only full bridge inverter without transformer, LC filter?

I'm studying about inverter PWM with textbook. The similar one with attached figure is in the textbook. I can understand how the blue chopped square voltage is made. In the text book, the red curve is ...
user avatar
0 votes
3 answers
79 views

Painfully Yet Steadily Growing Oscillator Output

I have worked out an LC-based Colpitts Oscillator (sharing the schematics) that produces output which grows painfully slow from 10 pV to 500 mV in more than to 3 minutes and settles there. Despite ...
Awais Mushtaq's user avatar
0 votes
0 answers
66 views

ERROR LTSpice from V tp gV

i have a problem here, it should be a sin but here is what i get and the Vin is in V and Vout is in Giga-Volt, which is wrong, what should I do?
Maya's user avatar
  • 23
4 votes
1 answer
610 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 ...
Arcadius's user avatar
0 votes
0 answers
39 views

Does a phasor of composite sinusoid give information?

I have a circuit with multiple supplies and each power supply has a different frequency. Would adding the rectangular form of the output give useful information about the composite sinusoid waveform? ...
Arcadius's user avatar
0 votes
1 answer
199 views

3-phase BLDC motor control

We have a 3-phase BLDC motor with 3 Hall effect sensors. I believe the motor is star connected but the datasheet has little information and we are still trying to obtain this information from the ...
MRB's user avatar
  • 412
1 vote
1 answer
131 views

How does Kirchoff's current law work for sinusoidal voltage sources?

I was solving a steady state question with sinusoidal AC voltage source and the solution for the question used Kirchoff's current law to find the nodal voltage of a node. Now, I used to think that I ...
Sam1470's user avatar
  • 57
0 votes
3 answers
177 views

Generate combined sinusoidal waveform (fundamental, 2nd, 3rd...) using PWM

I know that I can make sinusoidal waveform using SPWM, but how can I combine fundamental signal with different frequency signal (2nd, 3rd...) on a single signal created by SPWM?
Marc Paul Eumague's user avatar
0 votes
0 answers
61 views

Negative Oscillating Signal with Op-Amp?

I am trying to design a Wein Bridge oscillator that oscillates with frequency 1.5 kHz using LM741 Op-Amp. I simulate it in LT-Spice and obtained sinusoidal oscillation going both positive and negative....
Electronics_Beginner's user avatar
-1 votes
2 answers
207 views

What's the physical significance of a sinusoid's Bode magnitude?

What's the physical significance of a sinusoid's Bode plot's magnitude, at the sinusoid center frequency? Example: sin(wt), with w = 62.8 rad/s = 10 Hz. This has ...
J B's user avatar
  • 3
0 votes
1 answer
75 views

Can a system get immediately to the sinusoidal steady state?

Suppose we have a theoretical LTI causal system with zero initial conditions and we apply a sinusoidal input at t=0. If the system is initially at rest, will the output be equal to H(ω)cos(ωt+Arg(H(w))...
dimen's user avatar
  • 5
0 votes
1 answer
163 views

Sinusoidal Driving BLDC without FOC?

I want to drive my BLDC motor sinusoidal. In this point I want to model my system correctly to analyze it better. So I want to simulate it in simulink first. To get model with sinusoidal driving: I ...
raymurai's user avatar
0 votes
0 answers
59 views

Trying to Dampen a Boosted LC Circuit

I am currently implementing the circuit shown below where the first stage is a boost converter and the second stage (output stage) is an LC circuit with a boost topology. The goal is to take a 24V DC ...
PrematureCorn's user avatar
0 votes
1 answer
226 views

Are impedance calculations only specific to sinusoidal inputs?

All impedance formulae we've derived in my course and calculations e.g. combined impedances in series have all assumed sinusoidal steady state. My question is, does the notion of "impedance" ...
Gary Allen's user avatar
0 votes
1 answer
650 views

Design a triangular wave generator using a sinusoidal input

I've been going through online assignments regarding circuit designs. I've gotten a bit stuck on this one: Using a sinusoidal input voltage of amplitude 5 V and frequency 100 Hz, I need a triangular ...
Abhinav Tahlani's user avatar
-1 votes
1 answer
7k views

How to convert sine to exponential form? [closed]

In this question, he converted the sinusoidal voltage to exponential voltage. what's the formula used here ? This is not the same one used in this video Here is the formula derived in the video
ahmed osama's user avatar
1 vote
1 answer
89 views

Can AC harmonic quantities be expressed as a sum of phasors of different frequencies without confusion?

https://www.electronics-tutorials.ws/accircuits/harmonics.html The problem with AC harmonics is that each term has a different frequency, being a integer factor of the first frequency. I was wondering ...
AndroidV11's user avatar
0 votes
0 answers
31 views

Usually AC quantities have the x-axis as time, but phase shifts are done in angles. How is there not a unit conflict?

This feels like a very specific and stupid question, but I have studied AC circuits for a while already. I just didn't think about it that much, but why is it established that the x-axis we use for ...
AndroidV11's user avatar
6 votes
1 answer
444 views

Find the phase angle between two functions

Apologies if this is better suited for a mathematics forum, it's from my circuits textbook so I've decided to post here. Below is a practice problem from the textbook, with the provided solution. If ...
Aaron's user avatar
  • 95
1 vote
1 answer
2k views

What is the importance of peak factor and form factor?

I get that form factor and peak factor are suppose to be ratios involving the RMS, maximum and average values of current or voltage for AC circuits, but I don't get specifically why those ratios are ...
AndroidV11's user avatar
0 votes
3 answers
97 views

Driving multiwinding current transformer

About the circuit below: I'm using a Current Transformer with two identical secondary windings, L1 and L2. I can use them indistinctively since they are 1:1. The relationship with the primary is 1000:...
Blue_Electronx's user avatar
2 votes
1 answer
468 views

Can FOC be done with only one PID controller and a lookup-table that determines phase-offset?

Normally two PIDs are used to do torque-control with FOC -- one for the direct torque and one for quadrature torque. The reason for this is described here: Why are two PID controllers needed for FOC (...
Dan Sandberg's user avatar
0 votes
1 answer
152 views

Reference clock of 400 MHz oscillator or 20 MHz and multiply by 20?

I am trying to design a sinusoidal signal generator using AD9954 which is a Direct Digital Synthesis (DDS) with takes a maximum of 400 MHz crystal oscillator as reference frequency. It also has a ...
David Norman's user avatar
  • 1,495
1 vote
0 answers
111 views

Why do sensors or biosensors use AC excitation signal and not square wave signal?

I have recently started looking into transducers to measure a natural physical phenomena. The sensors I read about, especially electrochemical sensors like interdigital electrodes use a sinusoidal ...
David Norman's user avatar
  • 1,495
2 votes
1 answer
472 views

Finding the total impedance and voltage across open terminals

The question that I'm trying to solve is the following: In the circuit shown below, what is the total impedance in ohms across the open terminals? What is \$v_{T}\$ if \$v_{L}\$ is 80 vrms? This is ...
romeoPH's user avatar
  • 317
3 votes
1 answer
5k views

How does HFI (high frequency injection) work with BLDC motors

How does HFI work with BLDC motors. In this video: VESC HFI: Sensorless position tracking at zero speed he explains how HFI works, however i don't get how it can work with motors that have trapezoid ...
Ahmed Eshra's user avatar
6 votes
1 answer
3k views

Difference between SVM and sinusoidal PWM in BLDC

In this answer Answer to question regarding difference between 6-step and FOC, the author said: "Likewise if you have gone to the effort to implement a FOC you might as well implement a SVM block to ...
Ahmed Eshra's user avatar
0 votes
2 answers
294 views

How do I proceed when the current is Io = 2cos (wt)?

I have this problem: And I would like some help with how to proceed. My own thinking: I think Io = 2cos (wt) mA should be 2 mA. For VR (t) I think it should be VR (t) = 2 mA * 1000 = 2 V and for ...
Vetenskap's user avatar
  • 423