Questions tagged [device]

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Why does it seem like the ideal photodiode model leads to a violation of conservation of energy?

Short version of my question: Roughly speaking, the output power from a properly biased ideal photodiode feeding a resistor is quadratic with the optical input power, with seemingly no limit. So at ...
Kevin Brant's user avatar
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0 answers
37 views

Finding pressure sensor specifications of portable integrity test device

I have a portable integrity test device (BEA Technologies – Italy), model Z02030300 (X-150-N.) The pressure sensor inside is broken. I do not know the manufacturer of the sensor. Does anyone know a ...
Vũ Đức Anh - VN's user avatar
1 vote
1 answer
132 views

Justification for equivalent gate capacitance simplification in digital circuits

A MOSFET is, in reality, a four-terminal device with capacitances between each pair of terminals: These capacitances are, of course, the standard MOSFET intrinsic and extrinsic differential ...
EE18's user avatar
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5 votes
4 answers
1k views

Why do we usually operate well into strong inversion?

In textbooks like the venerable Gray and Hurst or in contexts like my introductory analog design class, it was always emphasized that with MOSFETs we always want our designs to obey some constraint ...
EE18's user avatar
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2 votes
0 answers
50 views

How to learn about memristors as a circuit designer? [closed]

I'm trying to learn about memristors to play with it in circuit design. I think it might be more intuitive to do tests and measurements rather than reading maths formulas. The problem is that I don't ...
George Guo's user avatar
0 votes
2 answers
357 views

ESP and a metal cover (but not on every devboad) cover under which it hides

This is regarding the metal cover on the ESP devboards, which covers, among others, the ESP itself, flash memory, etc.: This topic has been discussed here before, and the reason for this cover is ...
Karlsson's user avatar
  • 113
0 votes
2 answers
217 views

Is there a surge suppressor or power strip that doesn't draw power when switched off? [closed]

I've read that leaving electronics plugged in but not being used still draws power. Is this true? But if it was turned off it would probably not draw as much power as it would be if it was turned on? ...
1.21 gigawatts's user avatar
4 votes
3 answers
2k views

What is this used for and what is it? (Wooden base, metal strip connecting two terminal blocks with finger nuts and small screws.)

This was handed to us and I have no idea what the device is, or what its usage is.
Pococurante Bird's user avatar
1 vote
1 answer
59 views

Will the saturation current through one of these NMOS circuits always be greater than the other?

Is there a definitive way to know for all cases if an NMOS would have a greater saturation current if a resistor R is connected to 1) the drain side or 2) the source side? The assumption is that the ...
NoobFlop's user avatar
1 vote
0 answers
198 views

Remapping a PCI(e) device when another core is accessing the device

According to PCI(e) specs, is it undefined behavior to access a leaf device from a CPU core when another core is remapping that leaf device to another physical address (e.g. for MMIO on ARM)? If not, ...
Abhishek Anand's user avatar
-3 votes
1 answer
127 views

How to make LEDs produce light like incandescent light? [closed]

LED light flickers around 100 Hz and is caused by rectifying AC power. How can LEDs be made to emit constant light that comes from an incandescent element which does not flicker?
Justintimeforfun's user avatar
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0 answers
62 views

Automated Hardware/Software Test

I am an Electrical Engineer and I don’t have a strong Software Engineering background. My problem is: I need to test several Smart home devices. For example: a door that opens and closes (also 2 ...
Caio Miguel's user avatar
0 votes
1 answer
89 views

Trouble with body effect physics

I’m struggling to understand why a negative voltage applied to the bulk contact of an n-type MOSFET increases the threshold voltage. I read other similar questions and I get that the negative voltage ...
ale_zec's user avatar
  • 15
-1 votes
1 answer
91 views

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 ...
Stephen Muga's user avatar
1 vote
1 answer
476 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 ...
Nicolas SoundForce's user avatar
1 vote
1 answer
74 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?
user309220's user avatar
0 votes
1 answer
941 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 ...
user207787's user avatar
1 vote
2 answers
425 views

What are up-screened components?

What are up-screened components/devices in the frame of qualification of electronic components? How is it done?
lordlothard's user avatar
2 votes
2 answers
917 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 ...
user207787's user avatar
0 votes
2 answers
84 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?
user avatar
0 votes
2 answers
67 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 ...
user avatar
0 votes
2 answers
3k 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?
The Petlings - Official's user avatar
0 votes
1 answer
124 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 (...
zian's user avatar
  • 37
0 votes
1 answer
81 views

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 ...
Codebeat's user avatar
  • 1,326
4 votes
2 answers
448 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....
Jay's user avatar
  • 51
1 vote
0 answers
54 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 ...
Sahil Pasricha's user avatar
0 votes
1 answer
4k 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 ...
alsadk's user avatar
  • 101
2 votes
1 answer
2k 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?
Daria Zubova's user avatar
2 votes
2 answers
1k 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? ...
naota29's user avatar
  • 25
0 votes
1 answer
88 views

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 ...
eya_bklt's user avatar
  • 101
0 votes
1 answer
50 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 ...
RObertos12's user avatar
2 votes
1 answer
282 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 ...
plu's user avatar
  • 695
1 vote
1 answer
164 views

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 (...
Mohammed BENHADINE's user avatar
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 ...
brko's user avatar
  • 211
0 votes
2 answers
65 views

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) ...
norlesh's user avatar
  • 473
0 votes
2 answers
107 views

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 ...
Somanna's user avatar
  • 335
2 votes
1 answer
1k views

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 ...
Volker Siegel's user avatar
0 votes
1 answer
135 views

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 ...
ShoutOutAndCalculate's user avatar
0 votes
3 answers
220 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.
murty's user avatar
  • 109
22 votes
6 answers
10k 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 ...
Volker Siegel's user avatar
2 votes
1 answer
105 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 ...
Matteo Cucchi's user avatar
1 vote
2 answers
1k 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 ...
Robert Tufts's user avatar
2 votes
1 answer
1k 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 ...
mkroman's user avatar
  • 121
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 ...
Kristof Tak's user avatar
0 votes
1 answer
72 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 ...
Gamal Othman's user avatar
0 votes
3 answers
1k 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 ...
y.han's user avatar
  • 17
0 votes
1 answer
74 views

ADuC845 Eval. Board input signal not reading?

...
EmirCbn's user avatar
  • 33
0 votes
2 answers
5k 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? ...
Alan Mejia's user avatar
0 votes
1 answer
161 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 ...
mobin.ctr's user avatar
0 votes
3 answers
556 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 ...
Beginner 's user avatar