Questions tagged [electrical-engineering]

Study and applications of electricity, electronics, and electromagnetism. Use this tag when someone who has trained as an electrical engineer is likely to be able to answer your question.

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Is there an equation for the weight a servo motor can carry

Is there a formula/equation for the weight a servo motor can move. I am building a robot and think this would be of importance. Thank you for your time.
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How do I reduce the mains spike in a switched mode PSU?

I have a switched-mode PSU for a gaming laptop. It has a bad habit of burning out the switches on mains extension panels when I turn it on (two in the last four days). The turn-on surge is always ...
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RF Engineering - Cascading a 3 Port S-Parameter Network into a 4-Port S-Parameter network

I have been trying to cascade a 3-port scattering parameter network into a 4-port scattering parameter network that will ultimately be terminated by another 3-port network (as can be seen below). The ...
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Is my understanding of the roles of transistors in this circuit correct?

THE CIRCUIT'S FUNCTIONING This circuit is a rain water sensor circuit that buzzes when there's water on a probe.I found it on net.1 CIRCUIT COMPONENTS 3 Volts Battery BC 558 Transistor(PNP) BC 548 ...
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1answer
39 views

Temperature controller using pt-1000 sensor

I need to control the temperature of a system with high accuracy with error value of $0.1$ degrees celsius +-. I will be using temperature sensor PT-1000. I need to know what would be the best option ...
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16 views

Calculating kWh two-phase alternating network 3 wires

I want to do a project to measure electrical consumption but I have the following question: How to calculate kWh consumed in a 3-wire biphasic network? Example: I have the following chains on the ...
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11 views

Data rates and signal rates

I've been reading the 4th Edition of Data Communications and Networking - Behrouz A. Forouzan. In chapter 4, the author introduces digital data to digital signal conversion. I understand that a signal ...
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1answer
24 views

What is the most efficient way to heat air?

I'm currently playing with a school project. My goal here is to heat a stream of air to a significant temperature so I can demonstrate air expansion. I have a cylinder, with a few turbines, turning in ...
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1answer
22 views

Shop for process data acquisition equipment and software

I have used the Dataq products for brief data studies to troubleshoot equipment on a manufacturing environment. I am now considering a project to watch pressures, signals and other data collected from ...
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Signal convolution: continuous signals

I really didn't understand how to do it. Please, can anyone help me?? Determine h (t) * x (t) when h (t) and x (t) are the rectangular pulses shown in Fig. A. Plot the result of this convolution. I ...
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41 views

Determining the torque needed for a servo motor

I'm looking for a bit of clarity on a design I have in mind. Please bear with me as I have no background in physics, engineering and this is part of my first real DIY project, so the knowledge base ...
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2answers
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Cheapest way to connect ignition coil to spark plug for use in non-motoring application

I don't know the first thing about how engines work, but am trying to make a spark with a spark plug and ignition coil controlled by a power MOSFET. While trying to find a way to connect them both, I ...
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Why is the gain of an op-amp 0 when it is saturated?

My initial question got raised after a statement I read in a book under negative feedback - “It is assumed that the op-amp is not saturated”. I wanted to know why. According to my consequent research, ...
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Arduino Programming IR Sensors and Actuators

Create the circuit below (Arduino) You are supposed to use the following code (must download correct library if IDE is too old): ...
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2answers
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Is there a reason for the bearing to be held in place by this flimsy star chamber rather than a solid seating?

I have no engineering background at all, but when I bumped my small electric heater and it started whining and creating a burning smell, (since it's labor day with no stores open to buy a new one) I ...
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2answers
74 views

What do I need to operate this motor?

I am currently designing a tennis ball launcher. I am looking to use the friction wheel approach, where you have the ball passing through 2 spinning wheels and being launched by the frictional force. ...
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2answers
56 views

Clarification on how current flows from a socket into a device

I'm trying to understand a bit about electrical circuits. I've understood the basic equations like V = IR. They are a few things I'm confused about. My understanding is that when you have a circuit ...
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23 views

Can I still use this USB Hub with a blown capacitor?

I was doing some work on this USB hub and trying to get it to work and I was doing a test run when I heard a pop and smelt smoke. Sure enough, I turn around and it was a capacitor. I immediately ...
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78 views

What can be the mechanism used in devising a machine that can arrange the dishes properly to make the cleaning faster in the messes/hotels [closed]

In hotels/messes the used plates are often placed haphazardly, and the workers need to pick the plates carefully to clean them. This leads to longer washing times and longer waiting times for ...
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4answers
58 views

Why doesn't my wire follow ohm's law?

I have a 60mm length of wire with diameter of 0.5mm. Meaning it should have a resistance of 0.005 ohm. I put a constant voltage of 0.3volt through it, but it's only taking 7amp, but according to ohm'...
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1answer
118 views

Mechanical/electronic chalkboard cleaning device to replace the conventional duster to clean the chalkboard

The chalk board duster which is used by teachers to wipe the chalkboard seems very agonizing for them. What new mechanical/electronic devices can be devised to replace conventional chalkboard duster ...
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1answer
33 views

Calculating features of a 3 phase power timeseries

I have data from a number of high frequency data capture devices connected to generators on an electricity grid. These meters collect data in ~1 second "bursts" at ~1.25ms frequency, ie. ...
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3answers
104 views

Why Sony headset's charging station doesn't charge other NiMH batteries rather than which came with it?

I've got a Sony MDR-RF4000 wireless headset, which is already 7 years old, so obviously its NiMH battery (Sony BP-HP550-11, basically a pair of AAA NiMH rechargeable batteries tied together) shows the ...
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is there a specific time delta between two wifi hits of devices [closed]

I have a sensor which detects wifi signals of nearby devices if their wifi mode is enabled. To process these data, I want to know if there is a specific time delta $\Delta t$ between each wifi hit. ...
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27 views

Why are the synchronous reluctance motors not self-starting?

I have been studying synchronous reluctance motor since a month. I am curious to know why is this motor not self starting? If used with an inverter, this motor can be made self-starting. Or by adding ...
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1answer
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Coefficient of viscosity equation/answer issue

So I feel like my current answers are wrong but I am unsure, i feel like some could be a little high at -223 but I dont have the best experience in the field as this is my first time working with ...
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1answer
43 views

Not too sure how to approach this equation - fluids mechanics

Apologies if anything has been left out. Ok, so there is just 1 equation which I am struggling to understand, I have made an attempt and also written out the full equation in 2 parts, but I dont know ...
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1answer
47 views

Multicurrency Ultraviolet counterfeit scanner detection machine [closed]

https://www.google.com/search?q=ultraviolet+counterfeit+detection+scanner&client=ms-android-lava&prmd=sinv&sxsrf=ALeKk00_7L1PhL1uvSYN10i3xef6-Oq4sQ:1597382808532&source=lnms&tbm=...
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3answers
2k views

This device is used in washing machines to dispense water and cleaning solution in the right amounts. What is the working principal of it?

The following device is generally used in washing machines to dispense water and cleaning solution in the right amounts whenever needed. How does this device work?
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22 views

Configuring UART Port to 115200 on Renesas RX130 using Code Generator

Does anyone have insights into configuring UART port on Renesas RX130 microcontroller for a bit rate of 115200? I have successfully configured for a 9600, 19200, and 38400. I can read from the MCU ...
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2answers
32 views

Exclusive Or Circuit in SimulIDE

I have been testing basic circuits in SimulIDE. I created a basic exclusive or circuit that works most of the time. There are two inputs. When both inputs are off the bottom LED does not light up, ...
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2answers
36 views

What is the field on engineering that combines chemistry and electronics together? [closed]

I am looking for a career advice as I am interested in chemistry and electronics at the same time but the universities somehow have the two as different major. Is there any branch of engineering that ...
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Electrical component most likely to fail in window AC unit after power surge?

I have a window AC unit, 115 VAC, 10 amps. Power went out earlier in the week due to the big storm on the east coast and once it came back on every LED on the control panel was lit (not typical) and ...
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allan-variance noise terms of MEMS accelerometer

Specific noise terms are given in datasheets of MEMS sensors. In example the specification of accelerometer contains information about random walk and in some cases the bias instability. Both ...
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1answer
43 views

Help in Inverse Laplace Transform in Circuit Analysis

Inverse Laplace Transform $\frac{1}{s^2 + \sqrt{2}s + 1}$ so what I did it changed the denominator to complete the square format which is (s+$\frac{\sqrt{2}}{2})^2$ + $\frac{1}{2}$ , then I can solve ...
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35 views

Is there any side effect to soft start an AC motor?

I have a ground to water heat pump for my home heating/cooling (scroll compressor). The 3-phase 15kW-peak motor can be soft started but this option is off by default. I'm aware of all the positive ...
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1answer
13 views

T/R switch IC - HMC784AMS8GE IC does not work properly

I want to use a T/R switch IC to select the filters. So I made a small board test HMC784AMS8GE IC like the schematic below: The input (IN1) is the sine signal. But when I test, both OUT1 & OUT2 ...
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3answers
62 views

Electric go kart

I know this may be a physics question but, will a 48 V 1000 W motor with 3000 rpm be able to move a 500 lb go kart on a concrete sidewalk? And, can I use one 12 V 101 Ah 27 A deep cycle marine battery ...
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1answer
35 views

Switching a Circuit on-and-off In-step with the Rotation of a Drive-shaft (Mechanically)

I'm working on a project. The Salient part here is a drive-shaft connected to a bearing, onto which a simple circuit is mounted. I want to switch the circuit on every $π$ and off for the other $π$ of ...
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1answer
22 views

AC Harmonics on a system appearing as DC

I have a theoretical question about harmonics and DC. Given I have a circuit which has a power supply providing an AC input(230Vrms @ 50Hz), this then goes into a load which, takes this supply ...
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2answers
107 views

What is the name used for this type of connectors?

I am trying to identify the following connector used in an outdoor lighting product. Dimensions are length of 30mm and diameter of approximately 8 mm. I have done several google searches without much ...
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1answer
52 views

Scale on inclined plane

Suppose a common scale using 4 load cells is placed on an inclined surface and gives a 1kg reading for a given load. Will the 'true' weight of the load be (precisely) ...
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1answer
17 views

Building an ultralight electric hoist, what gearbox reduction / motor combination for torque / power requirements?

I am building an electric hoist. Design requirements: Lightweight Quiet Relatively low lifting requirements (100 kg) Relatively fast lifting speed (80 fpm -> .4 m/s) Low cost Simple Force ...
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25 views

What is the axial temperature distribution for a electric heating tube

Is the axial temperature distribution uniform for a simple and cheap electric heating element such as shorturl.at/tEJSU I understand that the current that is passed is same along the tube but not sure ...
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1answer
36 views

Is a geared motor better for a DIY wind turbine?

I have decent electronic understanding, but I've not much idea about motors. I plan to make a small wind mill which should be enough to power a couple of LED lights for like an hour every day. I was ...
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2answers
47 views

Where does the energy stored in a capacitor come from?

My textbook reads, “the power supply does work on the electrons, so their potential energy increases. You recover this energy when you discharge the capacitor.” I don’t get why this is the case... ...
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Monitoring Connectivity on ZigBee

I am trying to figure out some ways in which a ZigBee network can be monitored. As is the case in any network, here we have a central coordinator and several slaves joined, however, there seems to be ...
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1answer
31 views

Is having one large motor more efficient than having two motors half the size?

I wanted to use multiple smaller motors to have the same strength as a large motor but spread out across a wider area. Is that as good as one large motor or is there some efficiency or power loss in ...
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1answer
18 views

Connect LED with a 0.25mm fiber optic

I want to connect an LED (940nm signal) to a 0.25mm fiber optic. I have researched some possibilities, which involves using shrink heat tube, which is unfortunatly too large or simply buy couplers. I ...
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34 views

Why does my motor model match the actual data in transient but not steady state response?

I have created a model of a DC Servo motor using electromechanical system modeling. I simulated the motor in Simulink (MATLAB) and compared the data with data obtained from a real motor having similar ...

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