Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.

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.

Filter by
Sorted by
Tagged with
1
vote
1answer
50 views

acs71020 Connecting and reading voltage properly

I am using an ACS71020 3.3V I2C version hooked up to ESP32. I have connected the IC as proposed in the datasheet. Rsense used is 1.8k ohm as proposed in the evaluation board user manual for 230-240 ...
0
votes
0answers
15 views

EV charger testing BS7671 CPC-earth test

As part of the standards for BS 7671 it states: A device which disconnects the charging point from the live conductors of the supply and from protective earth in accordance with Regulation 543.3.3....
0
votes
0answers
34 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 ...
0
votes
1answer
24 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 ...
0
votes
1answer
45 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
0
votes
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-...
0
votes
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 ...
-1
votes
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 ...
0
votes
1answer
45 views

Arduino AC Motor Control and Automation? [closed]

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
votes
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
votes
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 ...
0
votes
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?
0
votes
1answer
59 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 ...
0
votes
3answers
59 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 ...
0
votes
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 ...
0
votes
0answers
58 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 ...
0
votes
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. ...
0
votes
0answers
33 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
votes
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 ...
0
votes
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
vote
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 ...
0
votes
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 ...
0
votes
0answers
35 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 ...
3
votes
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
votes
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
vote
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
votes
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 ...
2
votes
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
vote
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 ...
1
vote
1answer
23 views

Current flow in trailing edge dimmer

I was trying to learn something about dimmers for light bulbs. After some reading, I found that most trailing edge dimmers contain some variant of this: Found for example in this diy-project or this ...
0
votes
1answer
67 views

Is there any hope for this power supply to work on 220V rather than 110V? [closed]

I stupidly moved my laser printer with me overseas without checking whether it would take 220V. I assumed it would be like my desktop computer and accept both. Anyway, here I am with a 110V printer ...
0
votes
1answer
54 views

Best way to generate 26 Volts AC at 380-420Hz?

I have obtained a military vibrating-reed frequency meter that I would like to turn into an educational display unit, with a knob that adjusts the frequency from 380 to 420 Hertz, giving the user the ...
1
vote
0answers
58 views

How is AC load distributed across on-site generation and the utility?

I’m trying to understand the physics behind AC load distribution when distributed on-site generation is installed and the load is also connected to the grid. In the diagram below, I have a building ...
0
votes
0answers
19 views

meanwell psu inrush current and temperature sensor

I want to use a Meanwell PCB mounted power supply on my next project. https://www.meanwell.com/Upload/PDF/IRM-20/IRM-20-SPEC.PDF The spec sheet says that it has an inrush current of 20A/115VAC (I'm ...
0
votes
0answers
14 views

How can we simulate an AC position control system in simulink?

The final feedback loop which I got is the following How can I implement this using Simulink?
0
votes
1answer
21 views

Power Gain in a Small Signal Mosfet Circuit

let's consider this circuit, which is the equivalent of a small signal Mosfet amplifier. where RG is a gate series resistance which takes into account of the oxide leakage, and CGS and CGD are the ...
0
votes
0answers
50 views

how is this transformer working with DC? [duplicate]

As I was going through the SMPS circuits online I came across this circuit: I searched and learned that the transformer steps down or step up only AC power supplies and then converted to DC using ...
0
votes
1answer
38 views

Resistor power dissipation when driving optocoupler from ac mains

I followed this: https://learn.edwinrobotics.com/230v110v-ac-mains-detection-using-arduino-raspberry-pi-and-esp8266-thing/#Step2 With the exception that I used an LTV-814 that doesn't require a ...
0
votes
1answer
23 views

TUHS3F05 without other components

I'm planning to use TUHS3F05 for my ESP32 project. I'm very space limited so I need to optimize place as much as possible. In datasheet it is recommended that TUHS* it should be used with other ...
0
votes
1answer
62 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 ...
0
votes
2answers
57 views

Why is phase of current assumed to be 0 when deriving formula for instantaneous power in an AC circuit

In two different books I'm reading the authors start the discussion of instantaneous power delivered to a load in a steady state AC-circuit by assuming \$i(t) = I_0 \sin(\omega t + 0)\$ and \$u(t) = ...
0
votes
2answers
84 views

Confusing equivalent AC circuit (analysis)?

Context I'm doing some analysis on a dummy circuit. I've been explicitly told that the current generated by the source is a sinusoid: $$I_{0} = I_{p} cos(\omega t + \pi/2)$$. It also have been ...
0
votes
1answer
79 views

Will 2000A Inrush Current Damage Outlet Circuitry?

First time building an AC control system complete with motors, PLC, sensors, power supplies. All this is sourced from a 220VAC outlet. I have calculated the total current draw of all motors, powers ...
0
votes
0answers
33 views

I have a 2 phase ac motor I need to use as a constant speed brake, how do I modify my circuit to make this happen?

Please see the circuit below. I have a 2 phase AC motor 120v, 50hz, 250w, I need to use this to enforce a constant velocity against an accelerating force, or in other words the motor rotates ...
0
votes
1answer
37 views

connecting single phase motor to UK mains AC

I have a single phase single volt (UK 220-240) 1Hp electric motor with two capacitors, start and run. As photographed. This is to run my Milling machine. I need to connect the motor, via ...
1
vote
0answers
71 views

Apparent lack of rigor in Phasor domain analysis of steady state AC circuits

so I have encountered a hitch in my understanding of analyzing steady state AC circuits. I have looked everywhere for the answer to my question and I can find nothing. Usually when we analyze ss AC ...
1
vote
1answer
62 views

MCU conneected to AC Mains

I am developing a PCB which is having control MCU circuit, it will control the relays. Relays output are connected to 230V AC mains load (~100W load). This PCB is mounted on a cabin where people cant ...
0
votes
1answer
34 views

Switching 13.5VAC

Would a relay that's meant for mains AC work for 13.5VAC? If not, what type of component/circuit would be best suited for this application? This is meant for a door buzzer/opener that functions on 13....
0
votes
1answer
59 views

How can I Power a 20-50mA LED from the 240V AC Wires of a Motor in a Safe Way?

I own an ice cream machine which is perfect, except it lacks a light so one can check the state of the process. The motor case would be the perfect place to install a white LED, which will consume ...