Questions tagged [phase]

For questions about AC phases (e.g. three-phase systems) or phase in the context of waves, transfer functions, etc. Consider using in conjunction with related tags such as "three-phase", "transfer-function", etc., as applicable.

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Phase modulation for binary data - higher frequency harmonics?

I've recently learned about PSK and QAM. I first came across it in this youtube video (timestamped), and my understanding for how it works has remained the same as what is shown in that video. (I also ...
TrisT's user avatar
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1 answer
69 views

SCR phase control

I'm making a battery charger with phase control. While making the circuit I had some doubts. The transformer has a center tap, in this way I can make a full wave rectifier without diodes. Then ...
samuel mattio's user avatar
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1 answer
85 views

TCA785 obsolete, replacement?

I am looking to redesign an old circuit diagram's phase control IC. I can't find any ICs that can act as a replacement for this item: TCA785. What should I look for in an IC for phase control? It is ...
Wes Ellgass's user avatar
0 votes
2 answers
111 views

Which of these connections are incorrect and why? [closed]

Is there a difference in these connections and is there anything wrong on any connection? I am new to phase and neutral wiring. Kindly help me.
Alex's user avatar
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3 answers
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Phase difference between voltage across a capacitor and the source in a low pass filter

Consider I have a low pass filter like that in the figure. simulate this circuit – Schematic created using CircuitLab I have considered the voltage source to be \$V\$ and the voltage across the ...
M.Riyan's user avatar
1 vote
4 answers
488 views

How can I mathematically show that multiplication of j will cause a phase shift?

I have a simple question that I cannot seem to wrap my head around. let's say I have a function Asin(wt), if I multiply a '-j' by this function to get: -jAsin(w*t), I have been told that this is ...
Josh Girgis's user avatar
0 votes
1 answer
100 views

Why does my neon line tester glow even when I'm not touching its conductive screw?

So I'm testing a phase wire. When I touch the conductive screw top and use the tester like it's supposed to be used, it glows brightly. But when I'm only touching its plastic casing and not touching ...
Ojasvi Srivastava's user avatar
1 vote
1 answer
130 views

1-phase vs 3-phase current calculation

If we have a piece of equipment that comes in two models of power supply connection: Model A: 208V/20A-1P Model B: 120V/30A Measurements of the model gives its max load as 4400W at a p.f. of 0.9. ...
dennis009's user avatar
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2 answers
40 views

Using central heating pipe to detect neutral line with a multimeter

I'm exploring the capabilities of my cheap Aneng SZ08 multimiter, which I've recently purchased. I have a question related to the detection of a neutral line in the wall socket using a multimiter. ...
Gog's user avatar
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1 answer
327 views

Behavior of an electric stove on 1-phase vs. 3-phase

I want to replace my current electric stove that's powered by a single phase line with a 20A fuse. I'm in Germany with 230V AC. The overall power that can be delivered is 20A*230V = 4.6kW. I'm looking ...
Peter - Reinstate Monica's user avatar
0 votes
1 answer
44 views

Phase Differences and Wave Equation in ULA Antennas with Far-Field Assumption

I am analyzing a signal received by two antennas, where the second antenna is positioned farther than the first in the direction of wave propagation. I am encountering some confusion when it comes to ...
Naetmul's user avatar
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1 answer
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Match function generator output phase to line phase

I am new here so my apologies if I am missing pertinent details. I am trying to cancel a 60Hz EM field by sending a small 60Hz AC current through a loop of wire that I am generating with a function ...
Chromel1's user avatar
1 vote
5 answers
302 views

Why does the neon screwdriver (phase meter) light on just by touching the phase wire?

I had a question, can you answer it: as you can see in the picture I uploaded, the single-phase alternating current flows in one wire at one moment and in the next moment from another wire as in the ...
Mahdi's user avatar
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0 votes
1 answer
59 views

2 phase to 3 phase

I received a heat tunnel from Asia that has 2 wires. The manual says, "It uses two phase 220V and tri-feet plug with one of it used for the safe wire connecting case and the ground." I have ...
Doug's user avatar
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0 answers
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controlling power by AC frequency

I am working on circuit that will control a heat pad using a triac and microcontroller. In order to reach minimal EMI noise rather than phase controll I am controlling the frequency. schema: As I ...
greengold's user avatar
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1 answer
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Triac Phase angle control Heating method

I purchased a soldering station (Product Link: Tenma 2064549. Just for give more idea. Not for taking about the product.) few years ago and replaced the heating element. After replacing heating ...
user_fs10's user avatar
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2 answers
101 views

Phase on full wave bridge rectifier

I have a seemingly simple question: I have a full wave bridge rectifier that is connected to 220 VAC. When I stick a phase probe on it's (-) negative pole, I see it's light: And that's something I ...
greengold's user avatar
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0 answers
118 views

How to determine Phase Angle of 16-QAM

I am trying to figure out how the angles for the following input are obtained. For example, why is 0100 -105 degrees and not 45 degrees? Is there a specific method or do we estimate what the angle ...
miu.spiro's user avatar
0 votes
1 answer
99 views

Why are the phases of a distorted sine wave always these four values?

In this image I show how I distorted a sine wave with three defects in the transfer function, similar to what you might see in a real transistor or tube circuit. I did the FFT on it and the extracted ...
Dan Bullard's user avatar
0 votes
0 answers
63 views

Simulating mixer phase detector in ADS using harmonic balance problem

There is a basic property of a mixer in which it could used as a phase detector as shown in the theory below. A circuit was built where there two sources with same frequency but difference phase as ...
lub2354's user avatar
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0 answers
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Budget friendly battery charger controlled by phase angle ( SCR )

My circuit circuit is below so you can understand what I'm saying. I want to make a lead battery charger that can control the charging voltage and current (no discharge.) I have a circuit that ...
samuel mattio's user avatar
0 votes
1 answer
55 views

Phase velocity expression

We have a \$\beta l\$ expression which is represented as phase velocity. I know \$\omega_o=2\pi f\$. What is the exact expression for phase velocity used in here?
lub2354's user avatar
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3 votes
2 answers
692 views

Why does it work to connect between phase and ground, if the electrical circuit is not completed or closed?

Maybe it's a silly question about electrical installations. I'm not talking about rules, protections or if it is correct to do what I'm going to describe. I just want to understand why it works. For ...
Fabián Romo's user avatar
0 votes
3 answers
808 views

Difference between voltage and phase angle

The voltage at a node can be described by $$ V = |V|e^{j \delta} $$ in which \$\delta\$ is the voltage angle. Voltage angles are required to calculate AC power flows. The phase angle if often ...
Martiene's user avatar
0 votes
0 answers
58 views

STM32_2 Phase shift

I did PWM for 2 Phase. It works great, but after I stop my Timer Master and Slave in order to have Delay, I mean with HAL_TIM_PWM_STOP, doesn't work my timer slave ...
David's user avatar
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0 answers
55 views

Stepper motor stepping sequence analysis

I'm currently trying to educate myself on the stepper motor. The figure below is what I am trying to analyze. First I wanted to analyze the step angle for full step operation and half step. Which I ...
kam 's user avatar
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1 vote
1 answer
58 views

Why is the voltage distribution a quarter wavelength out of phase with the current in a half-wavelength dipole antenna?

Why is the voltage distribution a quarter wavelength out of phase with the current in a half-wavelength dipole antenna, as show in this image? It makes sense that in a graph over time, the voltage at ...
Jason Peng's user avatar
0 votes
0 answers
21 views

What is the phase displacement of fault currents on each phase in a symmetrical fault?

In a Line-Line-Line-Ground symmetrical fault, is the fault current on each phase also displaced from each other by 120°?
ethelrl's user avatar
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0 answers
36 views

ZL30251 phase aligned

I just want to confirm whether the part zl30251 has phase aligned outputs? If not, can it be aligned? Also, I can confirm that both the outputs are LVCMOS. Can you please help me with this? Also, i ...
user avatar
1 vote
1 answer
237 views

Solid-state analog phase shifter

I have a single A/C source that I would like to phase shift into three different phases, offset by 120 degrees, essentially resulting in something like below: I've seen folks out in the real world ...
Tom Hayden's user avatar
2 votes
2 answers
198 views

Air core inductor impedance vs frequency graphs

I wanted an inductor with at least 100 μH, so I used a PVC pipe and some enamelled wire (AWG 21 if I recall correctly) to create an inductor. The inductor does serve its purpose fine as a load ...
Grigoris's user avatar
3 votes
1 answer
664 views

3-phase to single-phase power - motor

I have a circuit with a motor that uses 3 phase power supply. The circuit includes a control relay (like this ), (L1 L2 L3 NO A1 and T1 T2 T3 - A2) and a thermal relay (like this) the A indicator ...
Dimitris's user avatar
1 vote
1 answer
106 views

Forcing multiple-quadrant TRIAC operation through gate ringing

I got the possibly hare-brained idea to cause a single TRIAC gate pulse to go positive and negative, and thus fire in (maybe not all four but) more quadrants: ThecLTspice simulation seems to show ...
rdtsc's user avatar
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0 votes
0 answers
58 views

180° phase difference alternator synchronisation

Consider two alternators with 180° phase difference in parallel feeding a purely resistive load. In my understanding, phase cancellation will occur. So, what happens to the power in the circuit?
ethelrl's user avatar
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6 votes
4 answers
2k views

Transformer 220/380/440 V 24 V explanation

I have a circuit that uses three-phase electric power (without neutral). There is an old transformer in this circuit (see image). It converts 220-440 V to 24 V. The input has the handwritten numbers &...
Dimitris's user avatar
0 votes
1 answer
74 views

Fl5150 in 3-wire application

I was curious to navigate through the datasheet of FL5150/FL5160 phase cut dimmer IC: Datasheet and for circuits that operate on 220v, there is only a 2-wire application in the datasheet, how can we ...
Kamal Moussafir's user avatar
1 vote
2 answers
256 views

What are the gain and phase margins from this Bode plot?

I thought I had a decent grip on how Bode plots work yet for this model that I am working on, I need to implement a lead or a lag compensator. A lead compensator, which I was thinking about ...
johnny_yes_papa's user avatar
1 vote
1 answer
75 views

Meaning of Phase Angle

In this Application Note, section 3.1, Can someone help me to understand the meaning of "magnitude of phase angle of the load" in simple terms? Phase angle between Rx and Tx or what does ...
user avatar
0 votes
1 answer
193 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. ...
Arcadius's user avatar
6 votes
5 answers
1k views

Why doesn't the bypass capacitor cause phase shift in this oscillator circuit?

I am trying to understand oscillator basics. I thought I already understood how a capacitor works, but I still get confused about it. This circuit is an RC phase shift oscillator. I understand that we ...
Darko's user avatar
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0 votes
2 answers
154 views

Linear phase with audio amplifier

I came across the following amplifier for an audio ADC input stage in an application note for the CSxxxx codecs (appnote, figure 2. Codec datasheet. VQ is approximately 2.7V for biasing.): I did an ...
celeryperson's user avatar
1 vote
1 answer
239 views

How to determine saturation in DC smoothing choke with capacitor, and how to simulate in LTspice?

This question addresses some of the issues with a choke made from a microwave oven transformer for producing smooth DC from a phase-fired SCR controller, as discussed in this question. The choke ...
PStechPaul's user avatar
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1 vote
1 answer
98 views

Why does PSPice invert this AC current?

I'm running a simulation on a simple circuit in PSPice 9.1: This voltage supply is set to provide a 1V AC signal with a frequency of 60 Hz. As the load is only resistive, the current should not have ...
Astor Florida's user avatar
-1 votes
2 answers
220 views

How does this phase advance loop filter work?

I am reading this paper titled A Versatile Digital GHz Phase Lock for External Cavity Diode Lasers. This is part of the circuit. I am confused about the functionality of the part labeled "Phase ...
Lennon Kirby 's user avatar
1 vote
4 answers
347 views

PLL phase frequency detector

If there is a constant phase difference between the VCO signal and reference signal, the phase frequency detector will always givr an error signal. How can the PLL lock in this condition? I mean the ...
user1870379's user avatar
-3 votes
1 answer
116 views

Constructive Interference of two AC waveforms [closed]

Is this correct? We have two AC waveforms of the same phase. 4000V 0.03 amps -> 120W 12V 60 amps -> 720W Total Watts 840W If these two waves undergo constructive interference: 4012 * 60.03 -&...
user1897830's user avatar
-1 votes
1 answer
1k views

Why this motor shows delta 220 / star 380 which is usually the other way round from what I know? [closed]

Brand new induction motor arrived in the factory,it comes with gearbox on top controlled by VFD, but I could not understand it's nameplate, it should have shown just delta / star without voltage ...
user295305's user avatar
0 votes
0 answers
37 views

What is the effect of the capacitor on the input power and torque of permanent split capacitor (PSC) single phase induction motor?

I need to know the effect of the capacitor on the input power and torque of a permanent split capacitor (PSC) single phase induction motor.
Abdelrahman Tawfik's user avatar
0 votes
1 answer
1k views

RC 90 deg phase shift

What does 90 deg phase shift actually mean? Like, consider this below RC circuit. simulate this circuit – Schematic created using CircuitLab From what I understand, when I apply a sine wave at ...
user avatar
2 votes
1 answer
156 views

Problems of optimal commutation depending on number of pole

I am trying to design a three phase 4 pole motor, control with six-step. My problem appears when I draw the commutation to try to see how everything work. First, with a basic three phase 2 pole, there ...
Cyril's user avatar
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