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Questions tagged [ac]

This tag refers to alternating current mains power. It usually applies to voltages with >100V RMS, but can also be used for ex. 24V industrial AC power.

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0
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3answers
102 views

Electric field strength from AC conducting wire in form of a loop along z-axis?

Let's say I want to calculate the electric field strength from an AC conducting wire, with a certain frequency and current. The wire is in the form av a loop. I want to calculate the E-field along the ...
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1answer
59 views

VFD as general use inverter

I'd like to have 3ph 208 in my house for general use (not a motor). If I run the output of a single phase to 3 phase VFD through inductors or a 1:1 transformer will it smooth the SPWM .output into an ...
24
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3answers
5k views

Why does inverter synchronization with the grid take 5 minutes?

We had some solar panels & an inverter installed recently. Every time the inverter is turned on (after maintenance or with the first light of the day) it has to synchronize its generation phase ...
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0answers
31 views

What material of a core put into the inductor would decrease the current?

Consider the \$AC\$ circuit: For various \$U\$ values set by the potentiometer, we have measured the current \$I\$ flowing through the circuit with and without core put inside the inductor \$L\$. As ...
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2answers
191 views

How to wire 220v to 1 ch relay

I bought the following 1 ch relay - Link (433 MHz), which is just like the one in this video - Link. I want to connect it to my room lightbulb which uses 220v, the thing is I'm not sure how to wire ...
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2answers
186 views

Complex power real and imaginary?

For the complex power equation S=1/2VI, are the V and I the real and imaginary parts or is it just the magnitude? For example, if I have V as 3+4i and I as 2+6i, is my complex power just 1/2*(3+4i)(2+...
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1answer
113 views

Approximate weight ratio between 50/60 Hz and 400 Hz electric machines

I need a fast (not to much elaborated) approximation figure of how lighter will be a transformer or motor designed to run on 400 Hz compared with an equivalent machine with the same power capacity ...
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1answer
23 views

wiring Tamura 4 pin hall effect current transducer to differential daq

How do i wire a 4 pin hall sensor: 200A model below https://www.mouser.com/datasheet/2/397/L03SXXXD15-469349.pdf I don't understand the wiring schematic below I currently have +15 to pin 1, -15 to ...
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1answer
44 views

Wiring 220 to AC/DC transformer help?

On this AC/DC power module the terminals are labeled N and L, can I wire 220 line to line both to N and L? See link to part https://www.mouser.com/datasheet/2/468/RAC10-K_277-1661832.pdf
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1answer
26 views

Forward Voltage VF Max 1V does this mean that the full wave w10 bridge rectifier can only allow 1 volts via it

I want to use a full-wave bridge rectifier. My circuit needs 2 amps of current and operates at 12volts (12V @ 2A). I found this https://www.tanotis.com/products/vishay-2w01g-e4-51-bridge-rectifier-...
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0answers
26 views

Changing an AC Signal with a MAX9926

We are using a MAX9926 in Adaptive mode to detect zero crossing of a crank signal. Its mode cannot be changed (PCBs made) however we have a particular use case where the signal presented is as ...
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2answers
108 views

Dc Motor giving ac as well as dc voltage when used as generator

When I rotate the rod or the moving part of motor and probe its output through a multimeter (set on ac measuring) it shows around 0.50 volts. When I set the multimeter on dc measuring, it still shows ...
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3answers
195 views

How does one determine the type (AC v. DC) and operating voltage of small motors?

I've become fascinated by Rolling Ball Sculpture (RBS) and plan to start building my first one soon. Typically a RBS uses a low-voltage, low-RPM motor to carry the marbles to the top of the structure ...
-1
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1answer
30 views

Lower ac voltage from 18vac to 12vac for Christmas fiber optic rotating motor and light [duplicate]

This picture from another thread online relates to my situation: (original) I have a transformer from 240v ac to 18vac but need to step it further down to 12vac. What size resistor should I use in ...
-2
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4answers
280 views

Why does a capacitor charge faster when there is a diode connected?

In an series RC circuit why does a capacitor charge faster when there is a diode connected in parallel with the resistor? I tested on an oscilloscope, using a square signal and this is what I got. ...
0
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1answer
44 views

Arduino AC Motor Control and Automation? [on hold]

My question is about the automation of single phase AC motors. I am aware that I can purchase TRIAC controllers with manual knobs or even 0-10V control inputs. I am new to the world of AC ...
0
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1answer
56 views

Have I calculated the peak rectified V and diode I correctly?

A 240V (rms) 60 Hz mains supply is fed to a trans which has 20:1 ratio. The output v from the 2nd winding of the transformer is connected to a full-wave rectifier circuit and a 10kΩ R. Assuming ideal ...
0
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1answer
58 views

AC Induction Motor Constant Speed Control without Tachometer

I want to run the AC induction Motor at a constant speed with LOAD also without Load. So I am controlling motor speed by TRIAC. I can control the motor speed, but my problem is:- I don't have a ...
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0answers
46 views

Multiple home appliances emitting the same high pitched noise

About two weeks ago, I came home and noticed a piercing high-pitched noise in my room. After searching for the source of this noise, I found it was coming from my PC's power supply unit. Later that ...
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2answers
135 views

Protecting a relay/SSR when driving AC window cover motor

I'm having trouble switching an AC motor. Relays spark and glue contacts, and SSRs start to flicker and not pass the full input after a while. The motor has 3 terminals for 230VAC mains. One is ...
0
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1answer
29 views

How to calculate time interval between current and voltage waveforms

Is it basically, phase angle / angular frequency? Also for a ac circuit with a single inductor is the phase angle going to be always 90degres, likewise with a circuit with a single capacitor?
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3answers
58 views

Full Bridge Rectifier - Voltage Drop Under Load

I am trying to get 5v DC by rectifying the output of a microwave transformer i rewound (the transformer gets approx 4.2V AC on the secondary winding). I managed to get approx 5V open circuit ...
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0answers
30 views

Eagle Net classes not working

I am trying to modify my Net Classes to be wider to run AC current through. (25mil). However, when I add a new class and then try to autoroute it doesn't use that new class. I get an error saying The ...
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2answers
45 views

Floating Conductor Next to AC Power Source

Let's say I have a conductive metal sphere connected to a 50Hz 1kVrms AC Power Source referenced to Earth ground. About 3cm away, there's an identical metal sphere suspended by a non-conductive ...
1
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2answers
1k views

Instantaneous Power versus Average Power

simulate this circuit – Schematic created using CircuitLab The above question is that of a past exam paper. I have a few questions regarding some of the theory and calculations behind this. My ...
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0answers
57 views

An electronic component differentiating the current twice with respect to time

Say a AC voltage source, V, provides current to a circuit with a resistor, R, and inductor, L. Then my equations to be solved, in terms of current will be: $$ V - Ri - L\frac{di}{dt} = 0 $$ I would ...
15
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6answers
37k views

Using oscilloscope safely with AC mains

I know there is quite few discussions already on this topic, but since English isn't my first language, I though it better to get some more information about this. I have used oscilloscopes to ...
0
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1answer
32 views

Diagnosing a chattering AC fan relay

The diagram below shows the control circuitry of a heating system. I am trying to understand why the wiring depicted here caused the fan relay (PC90-360Q) to 'chatter' constantly when powered on. ...
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0answers
32 views

Controlling a series of LEDs ( AC->DC via bridge rectifier)

I'm working on a PCB (Christmas Present) to take in A/C to a string of LEDs and control them (with transistors? and a microcontroller). This is a bit out of my league, but it is making me learn ...
0
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1answer
61 views

Designing PCB with AC Live and Neutral on two layers

I'm designing a smart socket that will route 240V AC Live and Neutral to a voltage regulator and also to a relay that will control the current flow. Due to the limited space, it will be easier to ...
2
votes
1answer
130 views

Power amplifier simulation and real time experiment mismatch problem

Thanks in advance to anyone who will take the time to read my first post here. At present, I am doing a simulation of a power amplifier in LTSPice. The schematic and relevant files are uploaded in a ...
0
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3answers
70 views

Controlling the speed of a single speed AC exhaust fan motor

I have this single speed exhaust fan: 30" Exhaust Fan with Shutter - Direct Drive - 1/4 HP - Single Speed. When it's running it's way faster and louder than I'd like it to be. So I'm trying figure ...
1
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0answers
69 views

Measure 220V alternating current with a multimeter in DC mode

What happens if we measure 220V AC from wall socket with a multimeter in DC mode (instead of AC)? If I remember correctly, it should show the average value of this sinusoidal 220V, i.e. 0V. Is ...
1
vote
1answer
784 views

Shunt Current measurement noise

I was measuring current through shunt method. below is the SCH and waveform captured. PB5-AI will to ADC which has max 1 Volt limit. Waveform capture across R30 So why this much noise on output ...
0
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1answer
95 views

Figuring out the AC equivalent circuit(re model) of a Pre-Amplifier and Tone Control Circuit

I need help figuring out the AC equivalent circuit of this preamplifier circuit. I'm quite familiar with all the simple BJT configurations but this is my first configuring such a relatively ...
0
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1answer
154 views

Ac current source(1-10mA) with help of 5V dc battery

I have been working on a project in which I have been using an Howland AC current source (it has an AC voltage source in it) as a current source. But as an upgrade, I need a current of same sort which ...
0
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0answers
34 views

Combining AC and DC components in same Spectra/Molex Microfit connector

I am making a control unit. It will interfaced with AC devices like fan, pump, light along with one DC device, namely, a Solenoid lock. All the devices will be placed outside of the control unit. I ...
1
vote
1answer
88 views

Variable Frequency Drive with AC motor, 30kW

I have a VFD that controls an AC motor which compresses air. It is an 30kW motor. I have set the parameters required to drive the motor and it runs the motor but not properly. During the test the ...
0
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1answer
161 views

AC voltage measurement upto 230V AC

How can I effectively measure up to 230 v AC using a PIC micro controller? I just want to measure Line voltage, and as per the measurement I need to apply in the design.
3
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0answers
367 views

Use 230V 50Hz electronics in U.S.A [migrated]

I want to visit friends in U.S.A. and may stay there for maybe a month. I would like to bring my electronics with me and need to know how I could use them in America. They use 230 V, 50 Hz (I am from ...
0
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2answers
198 views

Voltage phase delay

Is there a method of delaying the phase of AC voltages? I ask because if I could somehow create a second identical and overlapping sine wave 1 half cycle ahead of the original AC waveform in a power ...
1
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3answers
4k views

Does the RMS value for a non-periodic signal exist?

Does the concept of RMS VALUE applicz to a non periodic continuous time signal? If yes how to calculate it? If no, why is it not defined? My doubt is : What value does an ac voltmeter display for an ...
1
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2answers
3k views

Why do I need to “ground” my guitar pickup to the guitar bridge

When wiring my guitar pickup, I connected the ground wire to the ground of the output jack. After hooking that up, I would hear a hum unless I soldered a wire from the metal bridge of the guitar (...
0
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2answers
47 views

Do I need a fork terminal to install #8 into an 38660 Molex Barrier Strip?

Can I strip a half inch of wire from a #8 cable and screw directly into a 38660 Molex connector? Or do I need to buy a spade terminal. This is for an AC connection to the back of a DC power supply, ...
1
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2answers
63 views

Physical connection of AC and DC voltage sources in series

in many circuits (Amplifiers, Filters etc) at the input terminal I saw a sinusoidal voltage together with a DC term, i.e. a voltage like v(t) = sin(wt) + 1 [V]. We may imagine that this signal is ...
2
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2answers
64 views

Phase difference between resistor and inductor voltage in an RL AC circuit

In my textbook, it is given that \$\mathcal {E} = -L\frac{\Delta I}{\Delta t}\$. The graph of resistor voltage (\$V_R\$) and inductor voltage (\$V_L\$) in a series RL AC circuit is given similar to ...
3
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2answers
2k views

Conditions for maximum power transfer in an AC circuit

So, if we're given the circuit below: Known values are: \$E_g=35 \ kV\$ \$f=685 \ kHz\$ \$\underline{Z}_g=150 \ \Omega\$ \$\underline{Z}_p=(200-j300) \ \Omega\$ We have to calculate \$L\$ and \$C\$ ...
2
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0answers
59 views

Why should the primary winding of the transformer not be grounded?

I've been wondering what would happen if you grounded both star points of a Y/Y connected transformer. This shouldn't affect the voltages, so why really is it not advised to earth both the primary ...
1
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3answers
101 views

Computing the voltage across a parallel LC component at resonance?

Problem For the circuit illustrated below, I am trying to compute the sinusoidal voltage across resistor \$R_{1}\$ when the parallel LC component is in resonance: I setup my problem with the ...
2
votes
2answers
10k views

How can I determine the current rating of a capacitor?

I haven't seen any capacitor with the "Ampere" rating written over its body. Usually they have max. voltage and capacitance ratings, can i know "current" rating from both values?(Supposing AC voltage) ...