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-3
votes
1answer
54 views

How do I change the supply voltage on my phone USB port? [on hold]

Is there any program or application that can change the supply voltage on an Android phone so that it's something else than 5 volts?
0
votes
1answer
65 views

What company and/or government permits/licenses are required when selling an electrical device in the United States?

Are there specific licenses that need to be on hand, or any permits that need to be signed by various parties, in the United States, when an electronic device is sold? If it's easier, if the device ...
-1
votes
1answer
50 views

how do you typically tie the address pins and WP pin of I2C device? Do these lines need a pull-up/down resistor or just tied directly [closed]

how do you typically tie the address pins and WP pin of I2C device? Do these lines need a pull-up/down resistor or just tied directly.
0
votes
1answer
97 views

1 Device, 2 Power sources?

I was curious about this. I've searched other similar questions but they weren't quite the same. One mentioned the use of diodes but I would like to know if this would work first before adding ...
0
votes
1answer
46 views

Can someone help to find / create / add a device in Eagle Library?

I want to use FSL176MRT a integrated Pulse Width Modulation (PWM) controller and SenseFET IC in my SMPS's PCB design in EAGLE. It is not available in any library. Its a 6 lead TO-220 package device ...
7
votes
1answer
525 views

At the microscopic level, what exactly forces us into the “dark silicon” (i.e., the mismatch between transistor scaling and voltage scaling) problem?

I've read that if you fix the TDP of a chip, you cannot use all of the transistors simultaneously any longer. This leads me to believe that each transistor requires the same power as in previous nodes ...
3
votes
3answers
220 views

Scanning/photocopying vs. photographing the material

Why do scanners and photocopies scan the material? Couldn't they just have a digital camera + light behind the glass? A lens with fixed focus would suffice, since the sheet of paper would always be ...
1
vote
1answer
86 views

What is the purpose of a T-gate or H-gate in a body-contacted SOI MOSFET?

I've been banging my head against the wall with this question for hours. There are many examples of T-gate and H-gate structures that I've found, but I can't for the life of me figure out why the gate ...
1
vote
1answer
76 views

Why is erasure much slower than write for (NAND) flash?

Typical block erasure time for NAND is on the order of milliseconds which is one order of magnitude higher than write. Both of them are based on FN current. Why? Thank you!
0
votes
2answers
90 views

Voltage regulator question

I have made a portable device charger with a 5 volt voltage regulator(7805-TO220 package),a 9 volt battery and a few capacitors.The problem is,when I connect the charger to a certain device(whose ...
-2
votes
1answer
117 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 ...
14
votes
4answers
836 views

Inductive and capacitive terms

What it means when we say that some component or device is inductive or capacitive? How these terms are related to capacitors and inductors?
0
votes
2answers
502 views

Detect if usb device is connected on the other side of the cable

Is it possible to detect that there is a device connected on the other side of the cable without using any current sensor? I simply want my arduino to do something when i plug my phone to charger. I ...
1
vote
1answer
46 views

Are drivers and libraries the same?

Can driver for some device (for example LCD display), also be called library (a set of functions for work with)? If not what is the difference, and what term is used for what?
0
votes
1answer
113 views

How is water resistance of a device measured?

This question has relation to physics as well, but since it is electronic related, it is here. I was watching a video that is testing the water resistance of Apple Watch. They say, at 3 feet the ...
0
votes
1answer
65 views

Charge battery when power up, use battery when power down

I have a tiny little esp8266 that runs happily on 3.3V and draws about 250mA and I can make it sleep and use very little battery power at all. What I want to do is use supplied power when possible ...
0
votes
1answer
291 views

What could this device be? [closed]

I was visiting a hotel and by accident found there is somekind of device under the sink. It consisted of 2 parts that were connected wires. I think it measures something, maybe temperature or ...
2
votes
1answer
63 views

Unified Driver model for low speed and high speed microcontrollers with limited and good memory

I am trying to develop an experimental RTOS. I am stuck in the driver layer design. I want to make the driver layer libraries friendly for the other layers but then again I would like to have high ...
0
votes
2answers
98 views

Building a vehicle tracking device

I need to build 100 coach tracking devices. I am a web/mobile programmer, not an engineer, so I'm going to be looking at outsourcing for this. To outsource this work however I should know the ...
0
votes
1answer
167 views

Making a clock cp for counter, using a photodiode

I need to make a device that counts light impulses, basicly a light detector counter, i need help with my counter cp, how to implement a photodiode(can't find phototransistors in the stores) to do ...
0
votes
3answers
185 views

creating mp3 device playing sound in specific time [closed]

I need help with creating device that will be able to play sound (can be recorded or from mp3/wav...) at certain time, for example at 8:00PM, 8:15PM; 8:30PM ...until 5:00AM. Device must be powered ...
2
votes
2answers
81 views

How to customize the 'write' to instrument?

I'm communicating with Power Supply RIGOL DP832A via Ethernet. ...
1
vote
1answer
127 views

Don't understand spec sheet

I'm planning to buy a photo-interrupter, and I had a look at the spec sheet, but I didn't see much on the current/voltage of the device. I was thinking that it could run on 20mA, but I am confused ...
0
votes
2answers
110 views

A simple device to remotely alert someone [closed]

We are developing a solution that can remotely alert someone around a relatively small area (around 300 meters). Each user will carry a sort of pager. The server will send an alert to the device. The ...
2
votes
2answers
734 views

unusual transistor markings “C8550”

I am repairing a "wall-wart" charger for a Black and Decker battery powered edger which uses a 12 volt/7 amp hour battery. It has ceased to deliver charge current to the battery but the half wave ...
0
votes
1answer
80 views

Seperate device vs software solution

My apologies, I'm not really sure how to phrase this question. I'm a little confused about what is the advantage of having a separate circuit controlling a module vs connecting the module directly to ...
0
votes
3answers
163 views

What are the big plugs for that you find on high demand devices in North America (120V-Areas)?

Talking about AMEA socket system and 120V. High power demand devices like A/Cs do have bigger plugs with some switches on them. What exactly is their purpose? Seems like a fuse but isn't the socket ...
3
votes
4answers
385 views

Non linear device with two frequencies

I got this on an interview question and I still don't know the answer. What output will have a nonlinear device if we will give two random frequencies \$f_1\$ and \$f_2\$? I answered that it ...
1
vote
1answer
55 views

Determine the output voltage of an integrated ciruit

I'm planning to use an HPA674A (bq25504 EVM) which is based on the bq25504 IC to connect a device (wsn) that works from 2-3.6V which is connected to the Vstor pin and the storage element is connected ...
1
vote
2answers
388 views

How device drivers work

Can anyone explain how device drivers work? I have seen Arduino and other development boards communicating with the PC's USB port with the help of a FTDI chip. This thing can be made to work after we ...
-1
votes
2answers
57 views

Devices which consume substantial power in modern embedded real-time systems? [closed]

Could anybody cite examples (if any) of devices and peripherals in modern embedded and real-time systems which consume substantial amount of power compared to modern processors. As processors get more ...
0
votes
1answer
75 views

ATA/ATAPI low level question

I am trying to figure out what exactly is happening on ATA/ATAPI bus right after power-on. From what I understand - host shoud send RESET command, then after some predetermined time send query to ...
2
votes
1answer
451 views

Is there a standard for writing device drivers for microcontrollers?

I have written device drivers for microcontrollers using AUTOSAR. But I was interested in knowing if there are other standards for device drivers. I am planning to write for TIVA TM4C123GH6PM. It has ...
0
votes
1answer
2k views

USB Host vs. Device Detection

Here is a problem to which the obvious answer is "use a switch," but that is not permitted in the design. ;) I am writing software for a USB audio application that is supposed to be able to play ...
0
votes
1answer
243 views

Tech stereo damaged by dimmer switch outlet, why? [closed]

A low end Tech stereo was plugged into an electronic dimmer switch outlet. The stereo was only a few years old and was functioning properly prior to plugging into a dimmer controlled outlet. I ...
1
vote
1answer
177 views

How to design a Circuit that can turn a LED ON depending on the input voltage

I have three LEDs, and I want to turn the first LED ON if the input voltage is 4V , I want to turn the first and second LED ON if the input voltage is 8V and so on. Is it possible to do without any ...
2
votes
1answer
710 views

RFID Based Listening Device

I was just trying to make a passive cavity resonator based listening device just the same way as Leon Theremin did (the great seal bug). I know that I am to use metallized mylar film as the diaphargm, ...
0
votes
1answer
3k views

How can I capture naturally created static electricity so that it won't create a shock when I touch a grounded object [closed]

How can I capture the naturally created static electricity in our bodies, so that it won't create a shock when I touch a grounded object. I'd like to capture it and store it for future use, maybe ...
0
votes
1answer
67 views

Device for recording pic

I'm following this tutorial to make my own recorder PIC18 (http://rengenharia.com.br/?p=401), but I have a problem, I do not have the component "X1" (DB9 female connector for PCB). Anyone have any ...
1
vote
1answer
86 views

Using a Logic Analyzer for Device Drivers (low level)

Sort of a follow up to this question: http://stackoverflow.com/questions/19760764/learning-to-write-low-level-drivers-linux/19761953?noredirect=1#comment29386523_19761953 For example I want to take a ...
1
vote
1answer
206 views

What kind of device is this LT6251 MBR…CT?

Can't find any specs on this device (LT 6251 MBR10100CT or is it MBR|0|00CT or MBRI0I00CT). Can't find datasheet for it.
2
votes
2answers
604 views

Making an obstruction avoiding device without microcontroller

I want to make a toy device which spins to the left whenever there is an obstruction in front of it, without any microcontroller. Can anybody please check whether my approach in building the device is ...
1
vote
1answer
61 views

Optimizing signal voltage level for 5V device

Are there any benefits associated with using lower signal voltages? For example, if a 5V device has an input high voltage level minimum of 2V, would running input signals at, say 3.3 vs 4.5 or 5v ...
1
vote
1answer
2k views

Soldering smallest SMD components such as 0402 with Microscope?

I need to use as small components as possible but I need to do everything by hand. My plan is to use OSH Park for the production of the board. The answers did not focus on whether they used microscope ...
0
votes
3answers
3k views

Cheapest way to build or buy a remote controlled sound maker?

For my high school class's senior prank, we'd like to buy cheap prepaid cell phones (like these: http://bit.ly/VSqOk3), hide them in the ceiling tiles, and then call then randomly throughout the day. ...
-2
votes
1answer
1k views

Home automation appliances wired to micro controller with wireless control from ipad/iphone [closed]

I'm currently going to start developing a media controller for my room. This microcontroller would be controlled wirelessly from my ipad. so there's three parts to this, my ipad, simple ...
2
votes
2answers
195 views

Video camera exposed to lightning in clouds

Suppose you are sitting outside in the dark and the video camera in the mobile is ON. If the clouds are lightning again and again, will this damage the video camera? As our eyes can get damaged by ...
4
votes
2answers
303 views

What is this device?

I found this little device which got my attention. Maybe you can tell me what it is. Is it a I/O board with an OS running on it similar to Raspberry PI? ICs on the device: AMD: AM29F200BT-70EC ...
2
votes
2answers
273 views

Peripheral Devices

I have read few sources that says "Peripheral is a device which is connected to host computer but not part of it. A peripheral is generally defined as any auxiliary device such as a computer ...
1
vote
2answers
2k views

How to create small engine with timer

I'm not sure that this is the correct place to ask, but I have had great success with questions on the other stackexchange sites, so I'll try my luck :) I need a device, which can press a button on a ...