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-2
votes
0answers
26 views

Can a SIM number be identified using the phone signal?

when a call is made can the number of the caller be identified using the signal by anyone ?
0
votes
2answers
63 views

Bike mobile charger

Hi, I've made a battery operated mobile charger using this circuit. I am able to charge the basic phones (with 2100mAh battery) with it. But the problem is, I couldn't charge any smart phones ...
0
votes
2answers
31 views

Effect of WiFi hotspot usage on mobile phone circuitry [closed]

Despite the fact that mobile phones come in wide a variaary and form different suppliers and with different software, most mobiles todays have a WiFi hotspot feature that can convert a mobiles' ...
0
votes
0answers
10 views

Using USB CDMA dongle with USB extension cable goes into cable unplugged loop. Need help [migrated]

I'm using ZTE AC3633 cdma dongle which gives me internet over EVDO network. If I connect the dongle direct to the macbook pro its working fine, but sometimes signal drops and have to go out and fetch ...
0
votes
0answers
29 views

Detect connected Cellphone (USB) via Arduino

I have to detect a usb connected mobile phone via Arduino but still pass the data signal to another device. Now it works great if I just connect the USB directly to the Arduino and read the pull ...
2
votes
4answers
175 views

How does the mobile 3.5mm audio port work, and Can I light a LED from it?

I am trying to do this, light a LED from the headphone wire(mobile) but it seems it gives ac in there, I don't have much idea, please help.
1
vote
0answers
33 views

What is Virtual Array Antenna?

What is virtual array antenna (VAA)? I have searched it everywhere but i was unable to find direct answer to this question. I know this concept was built from phased array antenna. Please explain ...
-3
votes
1answer
56 views

Mobile detector

I am working on a project related to Phone detection and jammer and I have made a detector circuit but I am facing a problem that this circuit detects only old phones. I mean it wont detect any smart ...
0
votes
1answer
69 views

How is the output voltage of a mobile phone charger fixed to a rated value? [duplicate]

Here is the circuit of cellphone charger. I have seen the input voltage range for a cellphone charger to be 100-230 V but the output voltage to be fixed to the rated value(like ~4.5 V). So, my ...
0
votes
2answers
34 views

CDMA modulation syncronization

Related: How in CDMA mobiles receiver gets unique code to decode its respective signal? This question says that a cdma "channel" has a publicly known code associated with it. Ok. But, how is this ...
0
votes
1answer
86 views

Driving 4.2V TFT by 5V

I have a nooby question: Is it within the range of tolerance to drive a TFT (car electronics 4.3 inch low cost type) which runs on 4.2V internally (12V DCDC-converted to 4.2V by an 'XL1509 adjustable ...
0
votes
1answer
64 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 ...
-2
votes
1answer
110 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
2k 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
219 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
108 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
5k 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
92k 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
83 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
141 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
81 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
102 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
105 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
152 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
114 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
7k 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
355 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
252 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
192 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
375 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
1answer
67 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
856 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. ...
1
vote
4answers
172 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
1k 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
126 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
380 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
1answer
177 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
100 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
538 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
14k 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
121 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 ...
1
vote
1answer
289 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 ...
4
votes
4answers
9k 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 ...
0
votes
1answer
155 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
87 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
66 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
93 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 ...
0
votes
1answer
113 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
865 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 ...