Questions tagged [device]

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What is this technological device?

Today at work, I came across this device. One of the black lids has the inscription PGEP79. A small amount of colorless liquid was contained inside the transparent casing. Overall, it looks like an ...
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1 answer
66 views

HAL USB device library transfer complete callback (USB MIDI adaption)

I have been able to implement Zac Rogers USB MIDI adaptation of the Cube MX USB device middleware: https://github.com/zacrogers/blue_usb_midi I can send USB midi messages on both F103 and F411. It ...
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1 answer
68 views

Reduce number of device power supplies

I have three 5 V DC, 1 ampere devices running from three separate standard manufacturers 240 V power supplies. Can I connect the three devices in parallel to a single 5 V, 5 ampere power supply?
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62 views

MOS Capacitor band diagram question

In a MOS system, is the energy offset between metal/oxide or semiconductor/oxide always the same regardless of the gate voltage applied? In other words, are A and B in the diagram above always the ...
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2 answers
84 views

What are up-screened components?

What are up-screened components/devices in the frame of qualification of electronic components? How is it done?
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0 answers
71 views

Why does the majority carrier concentration near the junction not decrease under forward bias? (PN junction)

We see that the current due to the majority carrier decreases near the junction as shown above, which means the majority carrier concentration should also decrease since the diffusion current is given ...
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2 answers
79 views

Precisely determine the actual consumed watt of the device [closed]

What is the actual consumed watt of the device stated a value of input watt and a value of output watt which we often see it?
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2 answers
43 views

The definitive method to probe the device operating current

How can I measure the current a device consumes? I tried one that has 1.5 V power supply requirement. I measured its resistance with a DMM from the power supply box (with the batteries removed) by ...
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2 answers
336 views

Which alcohol is bad to use when cleaning computers?

I heard there are some alcohols that are prohibited to be used when cleaning a computer or an electric device. Apart from beverages, which ones are these?
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1 answer
87 views

Do not connect Vdd and Vss with AD732x ADC?

According to the AD732x datasheets, especially the figure of "Equivalent Analog Input Circuit (Single-Ended)", do not connect Vdd and Vss should have no effects except on throughput rate (...
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Feature 'logo/labels' on cases of self made devices

Not really an electronics question however has something to do with the tech you have used for your own projects. For example, on any consumer device with USB support, Bluetooth, HDMI 2.x etc there is ...
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4 votes
2 answers
360 views

Single AA battery to mains power

I am trying to figure out how to run a device that requires 1 AA battery (1.5v?) Using a mains adapter. All the adapters seem to be 3v minimum. Can anyone help please? Product details: https://www....
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1 vote
0 answers
50 views

Data transmission through multiple IoT devices

We are implementing a device which will have multiple sensors inside multiple houses in our local area. Each house will have 1 device fixed at a place and data will be transmitted to one central ...
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1 answer
578 views

What is the effect of using wrong DC adapter to power on an electrical device?

Electrical devices powered by a DC adapter have specific in/out voltage/current values, so as an example what will happen if we used an adapter with 9v/1A output for a 5V/0.5A device? Consider all ...
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2 votes
1 answer
793 views

Understanding XLR phantom power adaptor

It's a scheme for microphone adapter, from XLR to mini-jack, with the conversion of 48V phantom power to plug-in power 6.2V. Could you describe how the circuit works?
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2 votes
2 answers
290 views

When to consider Peak current/voltage vs. RMS current/voltage and vice versa

When manufacturers create power labels for AC electrical devices, what value to they use for the current and voltage? Do they use the RMS of the sine wave? Or do they use the peak of the sine wave? ...
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1 answer
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The constant time value for an electronic device [closed]

i am working in a data science project that require certain information about electronic devices. So I know that for each electrical circuit there is a permanent regime and a transient regime and ...
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1 answer
41 views

Difference in electrotherapy Lifepak 12 [closed]

I'm a beginner medicine student and I've got a question out of curiosity, why in defibrillators lifepak 12 or other versions..paramedics or dictors set energy for defibrillation and cardioversion in ...
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2 votes
1 answer
154 views

Vector monitor, purpose of a third "green gun" connection

I recently came into possession of a vector monitor, as shown below (Vector Monitor, Model: IO-1128, from Heathkit). Its got a red, blue and green "gun" connections. However, I am not sure ...
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1 vote
1 answer
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Create a synchronous network of 400 devices

I have around 400 devices that i want to address in a star topology. Each device controls a set of LED strips (27*12 resolution). The idea is display a video animation in a good frame per second rate (...
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20 votes
2 answers
5k views

What is the purpose of this device?

I found this device in my father's basement, but I can't figure out what this device is. It has only 1 SCART connector, 1 power cable and only 1 button in front of it. I think it may be some old video ...
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Looking for the category of IC that would send a signal to all selected output pins simultaneously?

What would a multiplexer like device that allowed multiple outputs to be addressed simultaneously be called? - am looking to address multiple outputs in an array (many as possible - probably ganged) ...
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2 answers
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AC to DC converter device (AC adapter) with adjustable output voltage and adjustable output current [closed]

Is there a device available in the market that can take an input AC from mains and convert it into DC and output it, the output current and voltage must be adjustable. I know there are AC adapters ...
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1 vote
1 answer
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Why is a DC to AC inverter called "inverter"?

A device to convert direct current to grid level alternating current seems to be called "inverter". It's typically called like that when used in a solar power system. Why is it called inverter? Does ...
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1 answer
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How to turn a motor while obtaining the angle it turned?

I need a device where it can turn mechanically, while be able to measure the angle of which the motor turned. One solution I thought about was to connect the motor with potentiometer. However, is ...
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-1 votes
2 answers
111 views

What is this device mounted on my wall?

I just noticed this device in my apartment and am wondering if anyone with some electronics knowledge can tell me what it is.
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22 votes
6 answers
9k 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 ...
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2 votes
1 answer
102 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 ...
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1 vote
2 answers
570 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 ...
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2 votes
1 answer
467 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 ...
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4 votes
3 answers
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 ...
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0 votes
1 answer
59 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 ...
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0 votes
3 answers
795 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 ...
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1 answer
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ADuC845 Eval. Board input signal not reading?

...
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0 votes
2 answers
3k 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? ...
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0 votes
1 answer
132 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 ...
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0 votes
3 answers
292 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 ...
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4 votes
3 answers
644 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 ...
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0 votes
1 answer
28 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 ...
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2 votes
1 answer
337 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-/...
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1 vote
3 answers
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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? ...
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0 votes
1 answer
144 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 ...
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4 votes
1 answer
2k 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 ...
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0 votes
2 answers
4k 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.
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0 votes
2 answers
180 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,...
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3 votes
4 answers
760 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. ...
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-2 votes
3 answers
297 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....
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0 votes
2 answers
356 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 ...
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-1 votes
2 answers
96 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 ...
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1 vote
5 answers
404 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 ...
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