Device Definition and 531 Threads

There are many wireless communication standards like: - WiFi - DVB-T /DVB-A - LTE - FM broadcasting As far as I know they are all using electromagnetic waves. And if they are all sending then the electromagnetic field amplitude is the combination of them all. Is it possible to construct a...

<Moderator's note: Moved from a homework forum.> Dear team, I wish to use CO2 to de-air a device by exploiting the physical properties of CO2 as a heavier, more dense gas to air and therefore displace air in a very thin tube that has a nozzle at the end where both air and CO2 can escape. I wish...

I’m looking for a device to produce electromagnetic fields and how can u control the frequency emitted looking to build or purchase looking to experiment any information either reply publicly or inbox me

Hey, i don't know much about physics but i have heard that gravitational energy is non efficient since it needs a lot of power. So this is what i had in plan.. Average household has 2 to 3 members with each waiting average 50 kilos. You would use their combined weight force to pull up a 1000...

Preface: Some people call the metering device on an air-conditioner the "expansion device". When I refer to the metering device in this post, metering device is synonymous with expansion device. ______________________________________________________________________________________ I'm a...

Hello all! I just discovered PF as I have been searching about a project I have been pondering for a day. The idea is to have a device that I can set my 3lb camera and have the device rotate left-to-right && || right-to-left over the duration of 2 hours for use in a sunset/cloud timelapse...

Hi. Double slit experiments are being performed successfully with increasingly large molecules. Some physicists (e.g. Anton Zeilinger) believe it might work with viruses as well. Assuming it works with a system that qualifies as a measurement device (be it a virus or something else complex...

I'm not sure I'm posting in the right category or even on the right forum but I need some guidance on building a simple signaling device. I want to make or buy a device that when installed on a piece of rental equipment a person can push a button and it sends a signal back to my office and...

Hello, I'm trying to send binary data over the power lines to a microcontroller, which triggers a relay turning on a light. I was wondering what kind of device would I need to use to achieve this? And how would I connect it up to the microcontroller? I'm fairly new to this, so if someone could...

Hello all. I'm a guy with big interest into electronics. I have multiple ideas that want to realize in real devices but yet I have only my introduction course in electronics I studied in college as a background. As a first step I want to make an easy electronic device but I have no idea where...

Hi All, I would like to make a glove with a small transmitter antenna on the index finger. A small receiver similar to a LoJack device would track the finger. The device would need to be extremely accurate to follow small movement (1 mm?) of the transmitter. I’ve made a device that uses an IR...

What is the resistance of Device Q when a current of 200mA flows through it? Wouldn't the resistance of the device be approaching 0 Ω as its characteristic resembles one of a diode (gradient = 1/R)? Apparently, the answer is just using V = I R, and solving for the resistance. Is there...

I want to do an application that can connect to my Electric scooter (the kind you stand on) and can get a speed and engine temperature readings, i'm looking into a device i can attach to the wheel or a temperature gauge i can attach to the engine and get a reading from both of them something i...

I want to make a device that can suspend in water via manipulating its density to as close to 1 as possible. I just thought that it will be cool to have a device that can stay in whatever position that I place it in the water. Any idea of how this could actually be done? I was thinking about an...

Hi. So I have a story idea and my main plot device has something to do with time. I want it to be a more science fiction than fantasy so I was hoping someone could help me. The general idea is, a man falls asleep only to wake up 20 years in the future, in one night, he cannot remember the last...

Hi All, I am trying to transfer files from my ZTE971 Android into my Windows 10 PC. Problem is computer is not recognizing the Android when I plug it into the USB port. Strange, since it used to recognizing it without any problem just a few months back. I have checked in device manager...

Dear Forum, Please advice. I have a project where I'll be implementing a device that helps with Bicep Curls, adding resistance to it. So I have an idea with 2 pieces of guards, one on the forearm and one on the biceps, it will be conjoined through a latch in the middle which will rest in...

Thank you for your time and effort. It is much appreciated. 1. Homework Statement I have attached the problem with the solution to this thread. Basically, the problem asks to construct the circuit model for a generic device by using the data of terminal current and voltage measurements. From...

Homework Statement [/B] The figure [attached] below shows a variable "air gap" capacitor for manual tuning. Alternate plates are connected together; one group of plates is fixed in position, and the other group is capable of rotation. Consider a capacitor of n = 4 plates of alternating...

For my Engineering class I have to work with three other people to design a device that launchers a disc golf. So far we have a basic design plan but we are unsure if it is actually viable. Essentially there will be a platform that holds the disc in place and will be propelled by 2 to 4...

I'm designing a device that consumes 450nA in idle (up to 2mA peak) and the maximum allowed voltage is 3.3V. The power is supplied by a battery with a voltage of 3.6V. One of the problems I've run into is: All LDOs I could find have a quiescent current consumption (Iq) greater than 450nA. The...

I'm writing a serialized Steampunk-fantasy story in which the cities float high in the planet's atmosphere using a combination of Magic and technology (sci-fi-ish steampunk technology) Though I want to bring it as close to real science as I can. From some google searches it seems that a vacuum...

Was reading this article: https://phys.org/news/2018-01-device-negative-massand-lasers.html#jCp The article claims that these guys have created negative mass? If that's true, isn't that ground breaking? It's one of those extraordinary claims that needs extraordinary proof, doesn't it? Or is...

Does anybody know where i can buy a device with which i can measure the frequency of light from various sources such as bulb light?

Can some please tell me the name of this ? this is just the shaft the part above is meant to spin this came out of a lyman case prep xpress for making gun gun cartridges someone bought it to me it is 120v but they pluged it into 240v and of course burnt it out there is no writing on it and i...

Homework Statement I am confused on when will pressure of two states be the same for a piston cylinder device. Below are two problems where one's final pressure equals the initial pressure and one is not. Homework EquationsThe Attempt at a Solution Initially, I thought a piston-cylinder...

[Mentor note: Thread title changed to describe actual problem being presented] 1. Homework Statement Homework Equations The Attempt at a Solution I understand you have to interpolate temperature and pressure of the saturated vapor from the table, since there is no matched final specific...

I ran across an earlier thread, no longer open for comment, regarding the science fictional 'implosion grenade' & what might produce a similar effect. One theoretical technology might have a possibility of producing such an effect, at least to some extent. It could be an outgrowth of the...

This is a plan for a device that is going to be made a user called "JaycubL" he has no confirmation but I would like to know if the concept is in the right direction. I am not the one making it

Homework Statement I have a project for physics that requires me to construct a self-contained egg moving device. It must move itself 0.5m, then pick up an egg (in an egg cup holder), then move another meter and drop the egg off onto a platform 1.0m high, then continue moving after dropping it...

Hi all, I'd like to know if there's a reliable tool that can measure UVA and UVB concurrently at regular interval and record it. Or if can't record, then at least can be connected to a computer or network and will send the readings at regular interval. or perhaps anybody can point me to a...

Researchers from Berkeley and MIT have made a clever solar powered device that can extract water from low humidity desert air. Good for arid places, like Dune!

i want to ask...is it any type of silicone sealant is suitable for medical application?? i need to find the sealant that are biocompatibility for pvc tubing and dialysate with body temperature. how about acetoxy and elastomer is it suitable??

2 slave devices to one system?? (3 TOTAL devices)

Homework Statement Assuming that an OWC device is floating/moored in monochromatic waves. When there isn't air pressure distribution inside (atmospheric condition) the device behaves as an undambed body (with the oscillating chamber open to the atmosphere). When there is air pressure...

Homework Statement I have a project for physics that requires me to construct a self-contained egg moving device, that must use falling masses to power it. It must move itself 1.5m, then pick up an egg (in an egg cup holder) off of a standard sized paint can, then move another meter and drop...

I was reading this article: https://arxiv.org/ftp/arxiv/papers/1005/1005.5206.pdf , regarding the mathematical description of a diamond-shaped cloaking device, and am struggling to understand how the authors found the coordinate transformations in equations (1) and (5). What is the process for...

i am planning to do a small diy wireless power transfer device. The circuit of the transmitter is receiver has just the coil and load arrangement. my query is, (please correct me if am wrong) -->to induce a voltage in the secondary coil, there must be a varying magnetic field right? -->but...

I have a 3-Axis Digital Compass IC HMC5883L I2C chip, I just want to use it to learn how to talk to sensors via a Matlab to raspberry-pie to I2C chip link. The set up from Matlab to the pi is straight forward and simple, the issue I'm having seems to be the address I'm being returned when...

Here is the picture of my apparatus.

Hi, So I have this situation, I'm totally inexperienced with anything electricity. But as faith has it sometimes, suddenly I need a device that would be able to measure the electrical conductivity of a thin film. Is there anyone who could guide me what would be the essential parts of a system...

This is a thought experiment: My PC is mounted on my ceiling. I want to run a USB peripheral through a cylindrical retraction device (like a dog leash). The device is going to mount to the ceiling also and rotate about it's vertical axis. This will allow me to pull down the mouse from the...

Homework Statement What is the uncertainty in 5.00mm measured by an analog device? Homework Equations No equations, Uncertainty and error analysis question The Attempt at a Solution I know that the uncertainty is half the smallest division but i can't figure out what is the uncertainty and...

I was told that the direction of the cross product is an arbitary convention to give rotation a "direction" + for one direction and - for the other. That it is simply a book keeping device to make sure different rotation directions are given different signs. It seemed to be the case as I am...

Hi, I have a waterproof smartphone with sensors like barometer, gyro, accelerometer, microphone). I want to do an app that 1) detects that the phone is underwater: I though in using some reading from touch panel as water is electro conductive and it may provide me some reading to indicate...

I have to choose four switching devices for a switched reluctance motor. I have chosen a MOSFET, transistor and relay, what other device can be used?

I'm stumped by this one... Any idea what it is? Inside there is a focusable optical target with 3 green lines. The white "pens" dip in ink and mark something. Any ideas?

Hello to everyone, I've just started my PhD in Mechanical Engineering. And we've to buy a computing machine of high end to use ABAQUS and COMSOL software. Can anybody recommend the machines which can run these both software. P.S: We have to use Windows because there seems to be some graphics...

Hello everyone, This Moslem fathy, I am a heart surgeon, This is a video of a surgical device, I would like to understand its mechanism in some Aspects http://psdl.engin.umich.edu/pdf/Awtar_JMedDev_FlexDex.pdf this is a pdf that expalins the concept I would like to know how the movment is...

Hi is there any device or experiment, which could measure Earth spin vector and magnitude, centrifugal/centripetal forces, so i could derive from it, where is west and east , what's the vector of Earth rotation and what's my lattitude. Im assuming these forces and effects has to be...