Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [device]

136 questions
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6 answers

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 have an off switch. There are multiple solutions…
Volker Siegel
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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 decoder, but I'm not sure. These are the images…
brko
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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?
Junior
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7
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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 plastic ones. Could a practical gadget be made to thaw…
Majid Fouladpour
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1 answer

Why are 5 mm LEDs always rated at 20mA?

OK, maybe not all of them, but by far most of the 5 mm LEDs I've ever handled are rated with I(max) = 20 mA and I've been using them for maybe over 15 years. Why is this? Is caused by the size of the chip that 20 mA is the max? Is it because of…
jippie
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Dead or alive: Operational transconductance amplifier

My first experience ever with an operational amplifier was with an LM3900 from a Philips experiments kit and these kits date from a long way back in time, when I was a young boy in primary school. I rarely see designs with operational…
jippie
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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 even though they are smaller; i.e., we cannot…
Wuschelbeutel Kartoffelhuhn
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6
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Torque measurement device calibration

I don't know if I'm at the right place to ask this question but here is my trouble : I'm trying to find a good way of calibrating a electronic device used to measure small torques (0 -> 25 mNm). Device adjustment : Our current way of adjusting our…
Andy M
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5
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2 answers

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 "Boot Sector Flash Memory" 2x HYUNDAI: HY628100B…
arminb
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What would make a laser measuring device more accurate

I was looking a varioos laser measuring devices (laser tape measures). Most of them seem to be accurate within 1/8th of an inch. I'm wondering what the limiting factor for accuracy is. Is it simply a calibration issue? the quality of the…
user379468
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How do I get the name or number of device?

In many cases when I am designing a circuit, I use transistors, ICs, etc, by using calculations. But when I go to the market I have to ask the product by its name which I don't know. How do I get the name of device,I am looking for? Is there any…
Farid-ur-Rahman
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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
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4
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2 answers

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:…
Jay
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Streaming camera solutions for RaspberryPi MCU

I'm trying to get a Raspberry Pi MCU to stream an A/V feed over the internet to a web server where I'll have some homegrown software capturing each frame and doing analysis with it. My general strategy here is: Get a camera and microphone sending…
HeineyBehinds
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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 this square law property become relevant, except…
Kristof Tak
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