Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [mobile-phones]

23 questions
8
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2 answers

Why can I see remote control radiation on my phone but not with my eyes?

I made this little video. You can see a white flickering light coming out of my remote control. When I look at my remote control with my naked eyes, there is nothing to see when I press a button of the remote control. Why can I see the radiation…
Deschele Schilder
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3
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6 answers

How does a mobile phone send signals?

I wonder how a mobile phone (handset) sends signals to the Base Transceiver Station (BTS). The BTS is obviously quite large and, thus, possesses much more power than a phone does. So, how is a phone able to send information? Receiving is quite clear…
Ben
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3 answers

ESP-WROOM-32 resets when I load a page from my cellphone's Chrome app but not when I load the web app from Chrome on my PC

I'm having a problem with my ESP-WROOM-32. I have a web app that worked fine in my mobile phone until a page with contact information was added. This contact information page has 7 images in .png format. The curious thing that is happening is that…
vram
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3 answers

How to add 0.2V per Ampère that device draws? (Voltage drop compensation)

I have noticed that many mobile phone chargers already do this: For each 1 A of current that the mobile phone draws, the charger's output will be increased by 0.05V or 0.1V or something similar, to compensate for the ohmic voltage loss due to the…
neverMind9
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2 answers

Identify that connector - Is it reusable?

I have an Asus Zenfone AR which has had the screen replaced 3 times. Last time I replaced it myself, Asus the first 2 times. Screen replacement went fine but once together I discovered up volume button didn't work. Upon further investigation, I…
DrTarr
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2 answers

Is fast charging a Lithium-Ion battery from 0% to 30% better or worse for the battery health than fast charging at 30% to 70%?

According to this answer, fast charging is only recommended for the battery from 30% to 70% instead of 0% to 70%, while I thought that the emptier the battery is, the higher of a C rate it can handle. So, is what he mentions in his answer correct?
neverMind9
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1 answer

Does signal source of mobile phone, from its 3.5mm headphone jack, act as a current source or as a voltage source?

Even though the audio output of the mobile phone (which we draw through 3.5 mm jack) outputs a signal that's a function of time, at a very short interval of time, this source acts as a dc source of constant magnitude. During this interval, does this…
Cinverse
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0
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5 answers

What type of embedded sytem is used in a mobile phone(cell phone)?

What type of embedded system is used in a mobile?Is it a microcontroller, FPGA or a DSP According to my understanding the basic and simple mobile phones like nokia 3310 used microcontroller since those phones had relatively simple applications and…
LECS
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How can I buy or build a USB cable that will provide minimum charge current but maintain data conenctivity?

Question: How can I build or buy a USB cable (or hub or adapter or anything) that will limit the charging current to the minimum (0.1A I believe) without obstructing the data lines which would break adb? Scenario/use case: As I'm certain people…
Freedom_Ben
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2 answers

Why do we need AC to charge our mobile phones?

I had been wondering why do we need AC to charge our phones and not DC? Can someone please give me a detailed answer for this?
Frozen God
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1 answer

Would a program for circuit diagnostics with image recognition be useful?

I am starting to learn how to write mobile programs and came with an idea. I was wondering if there is already a smartphone program that enables you to take a picture of the circuit and it automatically generates the schematic diagram or PCB and…
Ramiro Vargas
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0
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5 answers

How can a mobile phone being charged kill by electrocution?

We have in France a wave of warnings about using a mobile phone while being charged in humid environments (or when taking a bath). A charger is plugged directly into the wall socket and the charge voltage is low. I can imagine that with some "shady"…
WoJ
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1 answer

Phone handpiece teardown - what could this chip be?

I am trying to use this mobile compatible handpiece for a non mobile phone project and wanted to be able to use the 3 buttons on it. It has a power button, Vol - and Vol + I've traced the schematic. Most of it seems to follow the following I found…
Guy Taylor
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2 answers

How Mobile Phone Call Works

This may be a noob question, but I'm having a hard time and confusion finding the answer. How does a mobile phone call work in the mobile phone itself so that analog data (voice) is transmitted out of the mobile phone through the antenna ? In what…
Devkil39
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0 answers

Phone replacement parts: original vs copy

I'm looking to buy a replacement micro USB board for my Xiaomi Redmi 6. As your can note for example on this product page, there exist "original" and "copy" versions for the same component. The "copy" has a lot less components than the "original"…
Gras Double
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