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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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2answers
35 views

What terms to differentiate between a quasi-synchronous motor (eg an induction motor ) and a completely asynchronous motor (eg a universal motor)?

I am editing a table of motors. I am looking for the correct terms to distinguish two types of motors: motors whose speed is less than the AC frequency (all inductions / squirrel cage motors) from ...
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0answers
70 views

Does current in neutral wire flow like this? [duplicate]

I've read neutral wire in 1 phase AC at home has almost 0V at both ends. But still current flows through it. So I've assumed 0.1V potential at the other end near a resistance (bulb). Now there's a ...
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1answer
88 views

Why do we not get shocked by neutral wire and how can it behave as it does? [closed]

I read some articles and watched videos regarding 1 phase and 3 phase ac. And later found that for most home appliances we need 1 phase ac. Then I came to know about live and neutral wires. Few ...
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1answer
70 views

AC coupled sinewave

How can I see in this picture that the signals are AC coupled? Does not AC coupled means that the DC offset is 0 and the sine is centered to the origin? Both signals have an offset from what I can ...
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5answers
2k views

Does an oscilloscope subtract voltages as phasors?

I want to measure two voltages on an oscilloscope. They are not in phase. I want to know the magnitude of the voltage difference. The oscilloscope has an in-build math function to subtract the ...
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4answers
135 views

Safety: Can I harm myself using an AC, 9V 500mA power supply for experiments?

I'm about to embark on my first electronics project and would like to check off a safety question: I want to build a bicycle hub dynamo -> USB charger based on these instructions. It is basically a ...
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3answers
3k views

What is the name/purpose of this component?

I was wondering what is the role/purpose of the electric component in the red square. This is the schematic of a 230V single phase induction motor. What is also not clear to me are the connections on ...
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2answers
50 views

How to transform an AC signal of wide voltage to pulses

I want to build a device that measures frequency of possibly different electrical alternators, not having much control of their parameters. For this I need to get digital pulses out of the AC signal ...
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3answers
590 views

Why would an AC motor heavily shake when driven with certain frequencies?

I have an AC motor from an old TCL 160 Boxford NC Lathe, it has three wires named U V and W. I thought that incorparating the original driver to a modern control interface card would be difficult or ...
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3answers
61 views

120V between chassis grounds of two different devices [duplicate]

After experiencing a notable shocking type sensation after coming into skin contact with my laptop and phone (both metal and plugged into their chargers), I decided to probe the chassis of both ...
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1answer
26 views

Surge protector outlet with altered grounding potential

I realized that I have a voltage difference of 5 to 80 V AC (orange in Fig. 1) between the protective conductors (grounding cables, "PE-Leiter", yellow-green contacts in drawing) before vs. after a ...
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2answers
112 views

Why arc only happens when circuit on load?

I'm preparing research about high voltage electric distribution for my university but I don't understand why the arc only happen when current is flowing. I made my internship in an electric ...
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2answers
104 views

I'm trying to learn how to make these circuits but have no clue if I'm on the right track? [closed]

I've recently been doing some online tasks but I am really struggling to understand how build this circuit in multisim. I am also struggling to calculate the values listed in 2. and have tried to find ...
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0answers
41 views

AC capacitor current spike

I was experimenting with capacitor voltage divider circuits but something unusual happened. Circuit is really simple , I connected 100uF 16v capacitor into 13.85V 50hz AC supply Xc is 26.5 ohm So I ...
2
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3answers
122 views

Identifying function of passive components in op amp circuit

I was reading this report on a digital guitar effects pedal design and I came across the circuit above. "AUDIO_IN" is where the guitar signal enters the pedal. The signal is then filtered through the ...
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2answers
94 views

Unexplained amperage spikes

IT guy here - I have a device called a WattBox in one of my networks so I can remotely cycle power on an outlet. It also provides me with alerts when something falls outside set parameters. I've ...
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1answer
50 views

What AC mains phase information can be deduced from measuring at two distinct devices, connected via ethernet?

I a have a house with 3x20A grid connection. With the usual big loads like washing machines, kitchen. For each socket in the house (many...) I want to determine the phase a wall socket is connected to ...
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1answer
47 views

Finding a gain bandwidth product using a test frequency

For GBP datasheet parameters of Op-amps, I have seen datasheets with test conditions like gain and Rl, but there are also datasheets with ftest as their conditions. How do we calculate the GBP of the ...
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2answers
51 views

Help with my design: How can I add these voltages?

I have to design a circuit that simulates a voltage spike on a dc supply rail. The circuit has a button that, when pressed, generates a short pulse of controllable height (controlled by pot). The ...
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0answers
30 views

What's the proper way of mounting surge arresters on TN-S system?

I'm attaching a diagram with surge arresters put on each line. Most of the experts in the field say a proper defense against lightnings and switching events has three surge arresters - one between ...
0
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1answer
86 views

Heating vacuum tube filament via capacitor

As I understand vacuum tubes (like triode / pentode) usually are designed to be heated with certain current through the filament. And usually it is about low-voltage and comparatively high-current. E....
3
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2answers
374 views

Fan speed and power consumption

Really basic question that I've struggled with for a while. In low-cost fans, a series of mechanical buttons select fan speed. I assume each button is connected to a specific resistor which limits the ...
0
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1answer
36 views

MOSFET and TVS Voltage requirements for 120V single phase AC circuit

I am designing a circuit that will gate single phase 120V AC through back-to-back N-channel MOSFETs connected as shown below. When passing AC, one MOSFET is on and the body diode in the other is ...
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1answer
49 views

Pancake Coil Magnetic Field Strength

I am trying to measure the magnetic field strength of a pancake (flat) coil. I know the turns, inner radius, current, and frequency from an AC input and am trying to measure the magnetic flux so I can ...
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4answers
3k views

How do solar inverter systems easily add AC power sources together? [closed]

I understand DC power more than AC power. I know that given multiple DC power generators, easiest way to sum them is by connecting them in series. In paralel you'd need every generator circuit to ...
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0answers
48 views

Wiring asynchronous motor with terminal in middle of Aux winding

EDIT: This is likely just a case of poor/wrong labeling. .41 amps x 115v = 47w, not 16.5w I have a particular motor, salvaged from an dehumidifier. It appeared to run in two speeds when part of the ...
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2answers
62 views

AC/DC Converters in Series with the Same AC Source

Would it be safe to connect two identical AC/DC converters in series if they share the same AC source? My concern is that the negative DC output is grounded somewhere in the converters causing the ...
0
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2answers
112 views

Why is this circuit causing my breaker to trip?

I'm an electronics hobbyist and I decided to make my own electric heater/kiln thingy. It works fine for a couple of minutes, but then the breaker trips. This is my first project involving AC, so I'm a ...
2
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2answers
44 views

Reading voltage from coil on top of Qi Wireless Charger

I am a high school student doing a lab report on changing the number of turns of a coil and seeing the effect it has on the output voltage from a wireless charger. I am trying to take a Qi Wireless ...
0
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1answer
37 views

Single phase Ac Wire voltages

I'm sorry for asking a question this simple but I can't understand it . Single phase ac has two wires , phase and neutral but I don't know which wire change voltage . Like neutral wire is always 0 v ...
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2answers
51 views

Is it ok if I use all pins on non AC connector for AC

I intend to use non AC connector Hirose DH40 and DH37 for single AC line (230VAC). Connector single pin is rated 30V 0.3A. They did also did a test for 100VAC for 1 min. Plan is to use two ...
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1answer
46 views

Looking for an AC socket that mounts to a PCB

I'm looking for an AC socket (U.S.) that mounts vertically (not right-angle) to a PCB for a smart power strip project. It should have through-hole or tabbed connections that I can solder into slots or ...
0
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1answer
252 views

Allegro ACS71020 problem interpreting I2C data

I've added an Allegro ACS71020 to my Arduino project to measure power usage (circuit shown below). I can connect to I2C on 0x63 and I get response (check the image below) - but the values do not ...
0
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1answer
33 views

Non contact AC voltage detector resistors

In this non-contact AC voltage detector, I understand the working principle of taking a tiny induced current in the antenna and amplifying it using transistors. However, I do not understand why the ...
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2answers
58 views

What is the purpose of a mains X2 Security Capacitor and how to determine its value?

simulate this circuit – Schematic created using CircuitLab I am evolving an existing circuit which has a 230VAC input. The 230VAC has multiple loads: Transformer followed by rectifing circuit; ...
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1answer
86 views

Voltage step up [closed]

I have a 10 volt AC output from an audio amplifier and I want to amplify it to 20-30 volts. What device can I use to achieve this?
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0answers
78 views

Connect AC neutral to USB ground?

I have an AC supply that plugs into the wall and outputs 8.4V with three pins (+, -, and ground). I would like to save wires and use a six-wire connector to hook a Serial Bus and the AC supply into ...
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2answers
71 views

Current flowing in an open circuit to make it the same voltage

I've tried to research this answer for quite some time but i'm struggling to find a proper answer. I think my question falls between antenna theory and batteries. So in a dipole antenna we supply a ...
3
votes
1answer
106 views

How strong a transformer do I need to convert from 220V to 11V at 1.6A?

I have a (cordless drill) battery charger that has these specs on its back: INPUT: 120VAC ~ 60Hz 26W OUTPUT: 3.6V - 10.8V DC, 1.5A Where I live the wall ...
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4answers
103 views

Area Under an A/C signal wave form

I am working on a circuit that uses power from the wall outlet (50hz and 60hz) and I would to calculate the amount of power at different time between (0 and pi). The circuit has a power Factor of 1. ...
1
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1answer
93 views

LEDs and high currents

In smartening up my doorbell I've been playing with my illuminated pushbutton and have fallen into a bit of a rabbit hole. The doorbell normally: simulate this circuit – Schematic created using ...
1
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2answers
69 views

Is it safe to wire an AC-DC adapter directly to a DC motor? (with this setup…)

I just wanted to check that this setup is safe as I am not an electrical engineer, nor am I experienced... I am using an AC adapter which outputs 12 volts DC. It has a max current rating of 6 amps. I ...
3
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3answers
160 views

How does multimeter AC measurement work?

How does a digital multimeter measure AC voltage? My guess would be that the AC voltage is rectified and filtered into a DC voltage which is then measured, giving the peak voltage of the AC signal. Am ...
0
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1answer
33 views

How to calculate reactance from an impedance analyzer circuit?

Background I have an impedance analyzer that uses the below circuit: Source One can measure impedance of the device under test (DUT) by using the following formulas: ...
-1
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1answer
79 views

AC line surge protection with GDT in series with MOV

We often use GDT in series with MOV to protect AC lines as below. But i have Question as for 230V AC line and 275V Rated MOV - What Should be the Breakdown voltage of GDT ? Three options available :...
2
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5answers
1k views

Isolated audio without a transformer

I'm putting together a guitar pedal for splitting the signal to two different amps. One of the features I want to put in is a 'ground-lift'; isolating the signal to avoid ground loops between the two ...
0
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3answers
67 views

Adding small AC signal to a DC current using inductive coupling

Is it possible to add a small AC current on to a DC current in a wire using inductive coupling from an external source. Or if there is another way, I want to add AC ripples to a DC current. simulate ...
3
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2answers
154 views

Imposing AC ripple on DC voltage

I am trying to impose an AC ripple of 0.9V peak to peak (1kHz) on 36 volts DC supply for one of the test using following circuit. Without any load connected, I get the proper AC imposed DC voltage ...
0
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0answers
27 views

Rocker switch to power supply with unused terminal

Fairly new to the whole field, so please go easy if this is a stupid question. I was digging into the details of my 3d printer's PSU the other night to find out how it connected to mains, and I was ...
0
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0answers
40 views

AC resistance of LVAC transmission line

I'm currently working on a project to determine the transmission losses in an LVAC line, as part of an off-grid distributed generation system. The manufacturer of the cable has given me a DC ...