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0
votes
1answer
36 views

Mobile WIFI: how close can mobile devices be placed and still have a functional WIFI connection?

I wish to run a large array (50+) of hacked Android phones as a computing cluster. They will need to be networked so I plan to use their built-in WIFI radios to talk over a single WIFI network. (I ...
-10
votes
0answers
101 views

Insects eating my screen? [closed]

Here I have a most interesting but troublesome problem that I'm facing. My mobile is a Nokia X2-01. Yesterday afternoon, after listening to music, I have gone to sleep. Everything was normal. When I ...
-2
votes
1answer
84 views

wireless device to send data with low latency up to 1km

I need a device about the size of a phone with 2 buttons, the device will be used to let a server know the outcome of an event (2 possible outcomes). A mobile phone app would be the obvious choice but ...
0
votes
2answers
78 views

Is BLE 4.1 backwards compatible to BLE 4.0 ? Can a phone with bluetooth 4.0 talk with a mote with BLE4.1?

BLE 4.1 is out and it could be considered the biggest news for internet of thing developers. I want to know if my mote with BLE 4.1 can interact with iPhone 6 which has Bluetooth 4.0.
3
votes
2answers
126 views

How Channelization code is shared in HSDPA?

I am on my way to understand the HSDPA/HSUPA technologies. I have just started and came upon the topic of channelization code. I learned how these codes are generated - Hadamard code technique - and ...
-1
votes
3answers
87 views

What happens when gadget gets 100% charged

We see that when our mobile phones, laptops, i-pads, or any other electronic gadget requiring charging, gets completely charged it starts displaying that it has stopped charging like in my HTC phone ...
2
votes
2answers
350 views

Is over charging the phone while using headset risky [closed]

I recently came across a post in social network which was claiming to be a news about a girl getting electrocuted during her sleep with her headsets connected to the mobile and the mobile being ...
-3
votes
1answer
83k views

why Samsung mobile phone batteries comes with a chip like paper are they spying us? [closed]

yesterday I saw an WhatsApp message in that one person showing the Samsung phone batteries He remove the rapper and take out the black color thin paper or plastic sheet which is attached with the ...
0
votes
1answer
79 views

Makeshift way to drain a battery?

I have a 3.8V mobile-phone battery that I need to discharge. However I don't have any electrical components (say led) with me. What is a crude way to do this using household items?
2
votes
2answers
110 views

Modem to Modem via GPRS

I am working on a GPRS communication design. What I want to do to connects two modems together via GPRS. But I found that i could not connect. I was able to connect both modems to the internet using ...
0
votes
1answer
76 views

How can I link battery life to resistivity of a phone PCB?

Are there any equations/relevant explanations that can link resistivity of the "wiring"* (or other components) on a phone's PCB to its battery life, i.e. can I prove that using silver wires would ...
4
votes
2answers
88 views

why smartphones don't cause noise on the around speakers

Before the smartphones (or maybe before the some new tech) when a cell phone rings, the speakers around it made noises. Hovewer, nowadays they do not. Why? What changed?
0
votes
1answer
89 views

Why can current phones act as Wi-Fi routers, but not as mobile broadband (3G, 4G etc.) routers? [closed]

Many of today's smartphones enable users to share their own internet connection with others via Wi-Fi through tethering. However, from what I understand, current Wi-Fi has much shorter range and ...
0
votes
1answer
83 views

Sensors controlled by Mobile Phone

I have a project which is of very low costs. The management has at least agreed for a cheap Mobile set and a solenoid valves. They have also agreed for a few extra project budget. The solenoid valves ...
2
votes
1answer
109 views

Inherent exploitability and power state machines

I'm working on understanding power state machines in regard to mobile computing devices. Most of the information on this subject seems to stem from this article. It's not particularly important to the ...
2
votes
2answers
4k views

Which is used in mobile phones? A microprocessor or a microcontroller?

Please help me with this. I'm trying hard to get the specific answer. I want to know a particular answer. What we use in mobile phones? Micro-controller or microprocessor? Or both?
0
votes
2answers
248 views

mobile battery charging using voltage regulator?

Circuit shown at http://www.instructables.com/id/9v-USB-charger/ will that satisfy all condition of mobile charging through usb ? what is advantage of circuit shown at ...
0
votes
1answer
168 views

Can I connect directly a 3.7V 18650 li-ion battery to a mobile (cellphone)? [closed]

If I remove the 3.7V battery from my mobile, is it possible to connect to the battery +/- terminals a 3.7V li-ion 18650 battery?
0
votes
3answers
148 views

What's an easy approach to provide Wi-Fi/Webserver to mobile phone apps without hotspot

I'm a software programmer and I'm up to start a project of an embedded outdoor device which I will be able to control by any mobile phone. My preferred approach is having the embedded device provide ...
-1
votes
1answer
262 views

3.5mm headphone jack frequency range [closed]

I'm going to receive audio data from a device and handle through mobile's headphone jack. but my data has low frequency about 1Hz and depending what i found its too low for this port, I searched about ...
0
votes
0answers
119 views

Mobile Phone GSM Antennae Used | What are the Latest Types?

What is the best antenna type mobile phones are incorporating nowadays for GSM/GPRS connectivity? Is it PCB etched antennas or anther? I want to know this because mobile phones have the same ...
0
votes
1answer
65 views

What is the rate at which a mobile/cell phone listens for an incoming call or a text in standby mode? [closed]

As I understand, a mobile/cell phone, in the standby mode, listens to some kind of circular buffer in its memory for acquired packets from the antenna to check if there's something that regards ...
2
votes
1answer
642 views

How can I extend this circuit to use it in our real life?

I am planning to design a wireless mobile charger circuit next week. For that purpose, I have selected the circuit which is shown below and is collected from the post: wireless mobile battery charger. ...
0
votes
0answers
50 views

Low cost, light weight, cost effective sensor technology

Is ultrasonic sensor technology the lightest, most inexpensive and most effective for creating an unnoticeable mobile device that can also audibly detect a solid or liquid by an object in motion at ...
1
vote
4answers
144 views

Do cells phones put out a signal when charged through data out?

Do cells phones put out a signal when fully charged through data out? I am wondering this because there is a competition to see who can build the best and most efficient portable cell phone battery ...
1
vote
1answer
862 views

Could anyone explain the two-ray ground-reflection model in plain English

I am studying about wireless communications and I need to understand the two-ray ground-reflection model for one of my assignments. However, I fail to understand it. Could anyone provide a ...
2
votes
1answer
112 views

What kind of solar panel is required to keep a mobile alive forever?

I want to build a webcam from an old mobile and I want it to be solar powered. The phone use a 3.7V lithium-ion battery of 1500mAh capacity. The phone last 24h hours on one charge. So if I'm right, ...
0
votes
1answer
218 views

Can I use a 7805 as a current regulator?

Can I use 7805 as current regulator? My input is 12-14 V DC (battery) and I require output 5V and 500mA or adjustable. My background is CS so unaware of these ICs. I have searched LM317 and LM338 but ...
0
votes
0answers
22 views

CDMA Chip Sequence Sending and Receiving [duplicate]

In CDMA, every user has a sort of signature (chip sequence number). When we apply the signature on the receiving signal, only the intended person's signal is extracted from the total signal. But my ...
0
votes
1answer
128 views

2 sources one speaker - for old rotary phone

I have built a "mobile" phone using an old GPO 746, a Raspberry Pi and an old Nokia 6301, amazingly I have managed to get the audio to/from the phone's 2.5mm jack plug to through the GPO handset, ...
-4
votes
1answer
93 views

Field trip to a home-based mobile phone factory [closed]

What are the components I need for assembling a hobby mobile phone? How would I go about assembling such a hobby device? Are there laws governing assembly/use of such hobby devices?
3
votes
3answers
381 views

How in CDMA mobiles receiver gets unique code to decode its respective signal?

Transmitted data in CDMA mobile is encoded with a random code. Receiver requires this random code to decode data from the received signal. From where the receiver will get this random code?
1
vote
2answers
8k views

Why does this mobile phone battery have 4 terminals? [duplicate]

Why do some mobile phone batteries have 4 terminals? I want to use a mobile phone battery for my project.
-3
votes
1answer
111 views

Do mobile phones lower their radiation if connected to WIFI [closed]

Suppose you have a phone you use for surfing, but the coverage is poor. As far as I know, that means it would have to increase its signal strength to max, quite possibly to a signal strength much ...
2
votes
1answer
226 views

12v socket not providing enough current for mobile phone? [closed]

I've just installed a 12v socket to my motorcycle. The socket has a sticker saying "12V - 1A", and the user manual says that "use is possible up to a power input rating of 12W". Taking that into ...
1
vote
3answers
6k views

How does the phone detect if 3.5 mm jack circuit is closed?

I have an android phone to which i have plugged an earphones. So at the top of the phone, I get the headphone symbol which indicates that the earphone is connected (In other words, the circuit at the ...
1
vote
1answer
127 views

Where can I buy a finished mobile camera module? [closed]

I am interested in buying a really small camera module for one of my projects. I know I can buy some iPhone/Samsung camera replacements on Ebay. But I have no information on their connectors and ...
0
votes
1answer
79 views

What is a Nokia FAID? [closed]

Nokia is a mobile phone brand, but what is an FAID? I tried searching but no definition came up. I'm guessing it's a security feature checked by the hardware in order to function properly.
2
votes
2answers
62 views

What replaces MobiTex for sporadic low bandwidth usage?

Back in the day I would use MobiTex for low bandwidth usage for devices that simply needed a few simple commands sent or received. It now seems next to impossible to procure or use MobiText devices ...
0
votes
1answer
87 views

Combining audio outputs once amplified

I'm familiar of course with the preferable way to mix audio, that is prior to amplification. However, I have a few mobile radios with roughly 1 watt audio outputs, which I would like to send their ...
-1
votes
0answers
814 views

How can I isolate a short (in a mobile phone in this case)

I have a Nokia 6030 cell phone, and it's been serving me 7 years. It developed an interesting problem, which looks like a short of some kind: the battery drains very fast, for an hour or so, and the ...
0
votes
1answer
104 views

Charge controller for Li-ion or Li-Polymer battery

I am trying to work out the good charger for Mobile phones, which can serve as good performer for various smart phones out there in market these days & mostly using Li-ion battery. Charging has 4 ...
4
votes
1answer
2k views

Can the NFC antenna of smart phone read signals from (active) RFID tags/transmitters

Can the NFC antenna of mobile phone such as the Galaxy S4 or iPhone in addition to their NFC functionality, also be used to read signals from (active) RFID tags/transmitters e.g. from 20ft away not ...
4
votes
5answers
797 views

Why are smartphones and tablets ARM based?

Why don't these devices use Intel processors like laptops do? Why are they restricted to ARM? Also for Windows 8, do they want ARM just for tablets and smartphones or is it also for laptops/desktops ...
4
votes
1answer
119 views

Solid reasons for switching off mobile devices on air planes [closed]

Recently a flight attendant forced me to shut down my tablet PC for the period of landing the air plane, despite wireless and bluetooth being in air plane mode already. Questions: Are there ...
-3
votes
1answer
93 views

i would like to build a sort of mobile [closed]

i would like to build a mobile phone pendent for my little sister it would only make calls and only to one number i know of one similar device to what i am looking for: the Burg 5 but i would ...
4
votes
2answers
586 views

“Wireless” USB cable, via RF / 3G

I'm looking into the feasibility of a project to develop a USB-over-RF device for physical penetration testing engagements. The idea is that our tester could connect a device to a USB port on a ...
2
votes
0answers
162 views

Does living near a cell tower decrease your overall exposure to RF? [closed]

I understand that my mobile phone will increase its RF levels when it struggles to connect with a cell tower/base station due to distance. Also being nearer a cell tower will increase my exposure to ...
0
votes
1answer
330 views

powering android phone from 3 AA battery directly (not USB!) [closed]

I have Sony Arc phone which was spoiled by me (story OutTopic) as it won't charge lion battery anymore. the phone itself works perfectly. I don't want to do the regular 3AA to USB charger way. Trying ...
-1
votes
4answers
6k views

difference between voice and data services?

What is the difference between the voice and date services. I have read that for voice services T1/E1 frame is used and for data services a frame with a standard header and payload nd tail is used ...