Questions tagged [mobile-phones]

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

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 ...
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-1 votes
2 answers
55 views

Replace phone battery with power supply circuit BL-T5

I have an old nexus phone LG e960 I'd like to use for a project permanently connected to mains . The battery is long dead and it no longer charges. I've swapped it but the replacement didn't last long....
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5 answers
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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 ...
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1 answer
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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. ...
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2 answers
107 views

How Mobile Phone Call Works [closed]

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 ...
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8 votes
2 answers
3k views

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 ...
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3 votes
6 answers
3k views

How does a mobile phone send signals? [closed]

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 ...
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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"...
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2 answers
90 views

Using a "Normal" powerbank for a "Super Fast Charging" phone, are there any potential damages?

I have an Anker Redux 10000 mAh powerbank and a Samsung Note 10 Lite smartphone. My powerbank is capable of providing an output of 5V ⎓ 2.4A, with only "normal" charging mode (no QuickCharge or other ...
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  • 151
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1 answer
54 views

Telephone Call and Electromagnetic Waves [closed]

Can you give me a simple explanation of how do telephone calls work? I know that when I receive a telephone call, it means that my mobile has just received a certain Electromagnetic field. But in air ...
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1 answer
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How to cut a nano SIM out of a 8-pin SIM? [closed]

I have a 8-pin SIM, which I want to cut into a nano SIM (which only has 6 pins). Looking at the Wikipedia X-Ray image, I assume I should cut the lower 2 pins. Is this correct?
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3 answers
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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 ...
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0 votes
1 answer
236 views

SIM800: AT-command to get connected sender ids

I want to roughly estimate where my Arduino currently is. For this, I want to fetch the identification numbers of the stations it is currently connected to, so I can put them into an API which then ...
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0 votes
1 answer
51 views

If I need to send GPRS commands is it better to use a "proper" modem, arduino or a mobile? [closed]

I need to send some commands from a computer via GPRS protocol to some devices. The options I have found so far are: Commercial GPRS modem Arduino GPRS shield an old phone as GPRS modem Is there ...
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1 vote
2 answers
148 views

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 ...
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2 answers
190 views

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. ...
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0 votes
2 answers
117 views

Batteries have a constant charging speed from 0%→70% instead of being any faster at 0%?

A mobile phone I tested keeps charging at the same constant speed from 0% to 70%, which is 10 watts. It uses MediaTek PumpExpress (input power: 12V 0.83A, despite the wall charger is capable of 12V 1....
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