Questions tagged [device]

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20
votes
6answers
7k views

Can I disable a battery powered device by reversing half of its batteries?

When I have a device that is powered by two batteries, can I disable it by turning one battery around? For illustration, the purpose is to leave batteries in the device for storage, but it does not ...
2
votes
1answer
98 views

What device can switch ON and OFF different pads independently?

I am looking for a device, but I am not sure what I need: maybe you have ideas. I have a power supply connected to 16 electrodes. What I need is a device (see picture) between the power supply and the ...
4
votes
3answers
275 views

Good equipments to measure current consumption for IoT devices [closed]

I was asked to bought some equipment to measure the current consumption for the IoT devices. The company is a startup and has a limited budget for this (let's say less than 5k$). I'm looking for an ...
1
vote
2answers
59 views

SMD Device and manufacturer ID markings S2

I have a SMD device that I am am trying to identify. Can anyone point me to a manufacturer? Probably a resistor but I am not sure. Any help would be appreciated. The scale bar in the picture is not ...
4
votes
3answers
514 views

Internet weather device using wifi? [closed]

Does anyone know a reference design with bill of materials of less than 30US$ for collecting weather data from the Internet eg. Yahoo's and show it on a LCD? I found many design and dev kits but most ...
2
votes
1answer
64 views

General dimensions and recommendations for a USB dongle

I'm trying to create a device that connects via USB and sits in a users computers USB socket at all times, and I'm unsure of what the general dimension requirements will be. Ideally, this device ...
4
votes
3answers
2k views

Why are “square law” devices important?

In the literature, I often see the notion of square law devices. Why are these devices important, to the extent that they have their own characterization as square law device? In what context does ...
3
votes
4answers
905 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 will ...
0
votes
1answer
35 views

Connector identification (multipin connector for automotive touchscreen)

This connector is from a device connected to the touch screen in the car. This device is chinese, so I'm having trouble locating information about any part number or name. The connector has 4 wires ...
0
votes
3answers
157 views

What exactly are low speed devices? [closed]

The definition of I2C is - "A multi-master multi-slave serial bus used for communication between low-speed devices". However, I have been searching the web for a concrete explanation for this but ...
0
votes
1answer
41 views
3
votes
4answers
18k views

What is the purpose of a splitter?

I have a splitter SVI Digital SV-2G Splitter (5/1000MHz) from my Comcast high speed internet self-installation kit. I try to understand what a splitter is used for, so I found this Wikipedia article ...
0
votes
1answer
247 views

The forward voltage Vf of a diode

I want to know about the forward voltage \$V_{f}\$ parameter of a diode device, given an I-V charateristic curve and in ambient temperature. What is the criteria to define the \$V_{f}\$ for any diode? ...
0
votes
1answer
71 views

How can I power a device that requires 5-7V and 2.5-6 mA with what I have?

I have voltage pins on one device that outputs 6.23V DC and 70 mA DC. What type of circuit do I have to build that can power up another device that requires 5-7V DC and 2.5-6 mA DC using my 6.23 V ...
1
vote
1answer
3k 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
104 views

How to calculate the voltage used to light up the emergency light from the given details of manual..?

I have an emergency light device which is given by a small manual back side of it with some electrical specification. They are: Voltage: AC90-240V 50-60Hz Current: 0.1A Power: 18W Can I ...
0
votes
1answer
26 views

Connecting power cable to device without enabled power supply = battery low?

Example: Camera or Discman (XP-EV500) with DC power cable: If I connect the power cable to the device, but the charger is switched off or not connected to the wall, then the camera/discman indicates ...
1
vote
1answer
249 views

AC mains wire finder + live wire equivalent circuit [duplicate]

I'm talking about devices for tracing hidden AC mains wires in walls like this one: https://www.ebay.com/itm/3-in-1-LCD-Wall-Detector-Stud-Center-Finder-AC-Live-Wire-Metal-Detector-Scanner-/...
1
vote
3answers
131 views

How to make a self-recognition socket for diferent connectors (sensors)

I am working on an electronic device, to which will be a lot of sensors on wires connected to a panel with sockets. Is there any option that will recognise which sensor is connected to a which socket? ...
4
votes
1answer
1k views

Is there a preferred encryption scheme for encrypting firmware builds on external flash?

I have a product that is going to be deployed in large numbers, and I want to maximize the trouble that someone is going to go through to reverse engineer it (a high level of security). It is an ...
0
votes
1answer
135 views

How to spot different electronic devices? [closed]

Recently my university has changed traditional counter meters into intelligent ones where they cut the power for illegal devices. At first as the rules say, the illegal ones are those with power usage ...
3
votes
4answers
709 views

Is it possible to power an arduino-like device from soil?

I am exploring some IoT applications I could work on. One of them is a sensor that does some periodical measurements of soil and saves it into inner memory or broadcasts over low-power radio channel. ...
0
votes
1answer
5k 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
2answers
3k views

What's the difference between the term 'Device' and 'Machine'? [closed]

Limiting the question only to the electrical domain. Calling AC machines as ac device mean the same or there is a difference in the terminology.
0
votes
2answers
163 views

Do hardware designer consider software(Firmware or drivers) while designing hardware? [closed]

I like to know what's the procedure of building a new device? Foe example a hardware designer decides to make a new laptop that can run Windows or Linux, or someone wants to build a new Android device,...
0
votes
1answer
5k 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 ...
-2
votes
3answers
230 views

SPI to UART Convert without MCU

I want to make a pcb, there will be the device with spi and i only need to read it's registers and send on bluetooth's rx pin. It's a little bit expensive to use microcontroller to just read registers....
0
votes
2answers
253 views

Difference between electronic component and passive component

I am confused about the difference between a passive component like resistor and an electronic device like diode. I know about their functionality. But my question is why resistor is not called an ...
-1
votes
2answers
88 views

How can i record the rpm of a small spinning object with out the use of a hand held tool such as a laser.

How do I measure the revolutions of a moving object as it rotates around. Imagine a fan blade, I need to measure the rpm of the fan without using an outside tool such as a laser rpm reader. Ideally ...
7
votes
7answers
936 views

Could induction thaw ice?

Last week we had very cold weather; and as a result there were lots of frosted pipes (iron and plastic). I spent a lot of time defrosting metal pipes with a torch, but could not do the same with ...
1
vote
5answers
274 views

Why would I need a low-dropout regulator?

I am creating a device utilizing multiple components, all of which have an acceptable operaating voltage of about 5 V. One component has an operating voltage of about 6 V. I am looking at relevant ...
1
vote
1answer
257 views

How to create device variant with different pin count in Eagle?

I have a part that has 2 variants SOT-23-3 and SOT-23-5. Both have different schematics as one has 3 pins and other 5 pins. Package is also different due to difference in pin count. The problem is ...
2
votes
3answers
2k views

Do electronic devices consume more power when the ambient temperature is cold?

Just a casual observation: when it is winter, my personal devices such as cellphone and Ipad consume power more quickly compared when it is in the summer. But this could simply because of change is ...
1
vote
3answers
460 views

How can cold temperature (refrigerator, air con) fix a broken electronic device?

I had an air con remote control that wasn't working at all. But at some point I noticed that when I turn on the air con manually and the room gets cooler, the remote control works as expected. I ...
1
vote
1answer
454 views

Will a 24/7 plugged-in power cable kill my laptop's battery? [closed]

I'm using a Lenovo Y50-70 and Conversation mode is always turned on (plugged-in, not charging mode). Specifically, my question is: Will it damage the battery (or the laptop) if I leave the power ...
0
votes
1answer
568 views

get PWM values via i2c

-short answer: using an arduino does the Job- "Reading PWM Receiver Signal Using Arduino": https://www.youtube.com/watch?v=ncBDvcbY1l4 I have just started controlling electronic circuits with ...
2
votes
2answers
2k 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 ...
-2
votes
1answer
91 views

What is this white device? [closed]

I know this question might sound a little silly and this is probably not the best site to ask, but I would really appreciate any answer. My neighbours installed this device just opposite to windows of ...
1
vote
1answer
1k views

Eagle CAD Multiple individual parts in one device

Good day, I am trying to place multiple parts in one device. My use case is a foot print for a XBee chip. The device has two identical 10 pin 2mm SMT headers (NPPN101BFLC-RC: digikey link). There is ...
3
votes
1answer
5k views

Texas Instruments USB2ANY HPA665

I encountered device made by Texas Instruments with label USB2ANY HPA665. It has LED, mini USB and FloppyDiskDrive-like ports. I can't find any data-sheet, manual or resources what for and how to use ...
0
votes
1answer
76 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 ...
-2
votes
1answer
528 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
129 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
543 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
374 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
642 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
507 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
140 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 ...
0
votes
2answers
2k 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 ...
2
votes
1answer
70 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 ...