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Questions tagged [consumer-electronics]

For engineering questions involving consumer electronics. Support / troubleshooting questions about consumer electronics are off-topic and will be closed.

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How can I keep a low voltage electromagnet on continuously for long durations of time?

Background I have an application that requires an electromagnet (either 5v or 12v) to be powered on for long durations of time (up to a few hours). While looking for one online, I was having a hard ...
Jack Campbell's user avatar
2 votes
1 answer
53 views

Does MEMS/Optical Gyroscope record Earth's Rotational and revolutional angular velocities

I am using a 3 axis gyroscope (Android device) to record angular velocities using a sensor data logger application. When the device is placed stationary, the gyroscope recorded the following values: ...
Akash Sagar's user avatar
0 votes
1 answer
37 views

Residential 120V AC vs 12V DC

Can I repurpose residential LED lights (slim, 120V recessed) for my RV by directly providing them with 12V DC power, or is a more accurate approach required to bypass the existing circuit board?
Jfw's user avatar
  • 1
2 votes
1 answer
87 views

Why do most lithium batteries have 4 terminals?

Most consumer devices that have lithium single-cell batteries have 4 connections. I've noticed the following diverse types of devices, this is true: Samsung smartphone with removable battery GoPro ...
BetterSense's user avatar
0 votes
0 answers
36 views

How does this Dyson Airwrap work?

so I’ve been looking into Dyson a lot, and how their stuff works (like AirWrap) and I came across like this picture: Is that bit I circled a heating part please? How can it heat, it just looks like a ...
Tom's user avatar
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1 vote
1 answer
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Is a powder fire extinguisher not good for CRT TVs?

I'm about to buy a standard 6-litre powder fire extinguisher. However, in the description, they all say: Suitable for [blablabla...] and for electronic devices up to 1000 V. Up to 1000 Volts? But ...
Aljandro Barbone's user avatar
1 vote
1 answer
74 views

Should I be worried about the "electron shower" I receive whenever I turn on my 1989 CRT TV?

If I stand in front of it when I press the "small power button" (the one which actually turns on the screen, as opposed to the big switch just giving the entire unit power), my big 1989 TV ...
Victor's user avatar
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1 vote
1 answer
218 views

How realistic is the "death by CRT monitor" scene from Final Destination?

First of all, I realize that not only is this a fictional scene in a movie, but a movie (series) particularly infamous for its ridiculous, over-the-top death scenes. Yet, I have heard of basically ...
Rachlin's user avatar
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0 votes
1 answer
59 views

Is it really sane to drop buckets of water into a (CRT) TV on fire after unplugging it?

Today, I read this absurd (to me) claim on what to do if your TV catches fire: Collect water and fill the unplugged TV. You can fill in only from the side. This is a necessary security measure. The ...
Jorrel's user avatar
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0 answers
56 views

Are these 33 year old cables inside a CRT TV dangerous/dying?

Today I finally opened up and dedusted my 33 year old TV, fearing both a fire hazard with decades of dust bunnies piled up in there (or so I imagined) and all sorts of possible non-lethal issues ...
J. T.'s user avatar
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0 votes
1 answer
51 views

Why do inorganic LEDs wear out?

Why do inorganic LED bulbs have a limited lifespan? For example, a manufacturer may quote that a bulb or monitor powered by an organic light emitting diode(s) has a lifespan of 50,000 hours, while it ...
CoastCity Lapse 00crashtest's user avatar
0 votes
1 answer
33 views

How do I know if I can cut pressure sensors into different shapes?

I am building an imaging platform that requires the application of two pressure sensors shaped into a "hollow" semi-circle, pretty much C-shaped. To do this, I thought of buying the ...
user7077252's user avatar
0 votes
1 answer
51 views

Mackie CR3 bookshelf speakers only play incredibly quietly on max volume

I've got a set of Mackie CR3s which the company sent to me when I warrantied my purchased set whose L/R selector corroded (was able to save that set by removing the component and hard-wiring). The set ...
Kevbot's user avatar
  • 101
0 votes
0 answers
23 views

Is it somehow dangerous to spray compressed air into a CRT TV? [duplicate]

I am planning to unscrew the plastic chassis of my big old CRT TV, after having it unplugged for 24 hours, and then spray compressed air all over the internals to remove all the heavy layers of dust ...
Dillan's user avatar
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1 vote
2 answers
68 views

Why am I getting such conflicting safety advice regarding opening up and dedusting/servicing my CRT TV?

I have asked questions on Stack Exchange. I have watched many videos on YouTube. I have asked professional TV repairmen. I get wildly different advice on the safety of opening my 1989 28" CRT TV. ...
L. Yerke's user avatar
0 votes
2 answers
95 views

Why does my 1989 TV have two separate power buttons on the front?

First, there is a big, square one always visible, which seems like the "master" power button (besides the cable). It is pressed in and you clearly "feel" that the TV is turned off. ...
R. Cooey's user avatar
0 votes
0 answers
37 views

What does the "RGB" button do on the front of my old TV?

JVC, AV-S280ENT. This button exists on my 1989 TV. What exactly does it do? It seems like it would "enable RGB" for one SCART connector at a time, but what does that even mean? Why don't ...
Gleed's user avatar
  • 1
0 votes
1 answer
52 views

Is it dangerous for a child (or anyone) to bang away with a hammer and unscrew an old clothes washing machine?

In the mid-1990s at the latest, possibly something like 1992-1993, our family's clothes washing machine, presumably from sometime in the 1980s, broke down. My dad brought it out on the driveway ...
T. S.'s user avatar
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0 votes
3 answers
224 views

How dangerous is it for me and the TV to open up my CRT TV to dedust it with compressed air?

I've heard many times warnings about opening up CRT TVs on your own, because they contain scary old capacitors full of scary electricity, ready to zap your heart from you just looking at them. But I ...
Patrizio's user avatar
0 votes
2 answers
95 views

Does an iPhone on airplane mode continue to emit electromagnetic radiation field?

I've been told that it does because it's still searching for networks or something, which doesn't really make any sense to me. But what does fit somewhat with that are notices in the android interface ...
JosephCorrectEnglishPronouns's user avatar
14 votes
2 answers
3k views

Why does the manual to a 1989 TV almost dedicate a page to the "pin assignment" of the SCART connector?

It is a bit unclear whether this is the "user manual" or the "service manual", the latter which may have only been used service people, but nevertheless, why would it go through ...
M Clouden's user avatar
  • 141
1 vote
0 answers
68 views

What on Earth is a "mute module"?

Studying the extremely intimidating manual for my newly found and rescued 1989 JVC television set, which makes me feel very stupid and as if I'm looking at some sort of alien technology, I found this ...
N. Pook's user avatar
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3 votes
2 answers
81 views

How do 120V AC dimmable LED bulbs advertised as "flicker free" work?

I'm a layperson, not an engineer, so forgive the ignorance. I want to replace some dimmable 120V AC G8 xenon bulbs with LED bulbs, but so far three different LED bulbs I've tried, all advertised as &...
Tim's user avatar
  • 203
0 votes
1 answer
45 views

How can a fan keep spinning normally but suddenly move very little air?

I have a small portable fan, around 15 cm in diameter and lately it is behaving oddly. Basically I turn it on, the airflow is good but then after 10 minutes or 30 minutes or sometimes hours, the ...
user81993's user avatar
  • 153
0 votes
1 answer
44 views

Why do I not get zapped when I hold my fingers on each end of an AA battery, like 3R12 ones?

When I was a kid, I got an 3R12 (or are they called R12?) battery. I don't know why, but I tried to put my tongue so that it touched both of the little metal things, which made it tingle. It felt ...
Battery Man's user avatar
0 votes
3 answers
101 views

How did this tape recording possibly happen on a technical and logical level?

Recently, I dug up an old C90 audio cassette from when I was a kid in the early to mid 1990s. It's possible that it was already a few years old then, used by my parents and possibly others. I set up ...
Anikin's user avatar
  • 1
0 votes
2 answers
57 views

What do the different "mA" versions of this "battery eliminator" mean?

Page in Swedish, but has a photo: https://www.jula.se/catalog/hem-och-hushall/hemelektronik/batteriladdning/batterieliminatorer/batterieliminator-409049/ This device allows you to select between 3-12 ...
Lowis's user avatar
  • 11
-1 votes
4 answers
42 views

Time period of charging a mobile phone via car

As car batteries provide only 12 V instead of ~230-250 V, I assume it takes much longer to charge them compared to a common wall socket?
Ben's user avatar
  • 123
3 votes
2 answers
57 views

How is it possible that "fiddling around with" batteries can apparently give them more power?

I have a flashlight which I use when I have to get up in the night in the pitch-black room. It takes three AAA batteries. Recently, it has been rather dim, so I assumed that I would have to switch ...
Doran's user avatar
  • 31
0 votes
1 answer
64 views

How to know which opto-coupler is suitable for high current application?

I would like a suitable opto-coupler to use as isolation from a 12V and around 30A current and another for 5V and around 30A. Are there any good opto-couplers for those ratings?
Pix's user avatar
  • 33
1 vote
1 answer
495 views

Why does the manual to my floor fan tell me to pull out the cord whenever it's not in use?

In the manual to my just-bought floor fan, it says this (among many other weird requirements/expectations): Pull out the plug from the power point when the product is not in use. Do not pull the ...
Yoshito Y's user avatar
1 vote
0 answers
226 views

Analysing UART Signal From E-Scooter Controller

I'm currently working on a project with an electric scooter, I intend to install a larger battery into the scooter and also replace the stock 300W controller for a VESC. BUT I want to keep the ...
Arran's user avatar
  • 11
1 vote
1 answer
56 views

Is it only "home-burned" CDs/discs that "expire" in a few years, or does that also apply to "professionally pressed" ones as well?

I've many times heard things along the lines of: Those CDs/DVDs won't last forever. In fact, the data will be gone/corrupted in just a few years. Does this apply only to discs that were "burned&...
Torez's user avatar
  • 11
0 votes
1 answer
56 views

Can internal heat reduce significantly a laptop's lifespan?

Some days ago I had an heated debate (pun not intended) with a friend regarding the use of my laptops. Basically he says which I'm slowly killing them by using them for computing intensive tasks which ...
Emiliano S.'s user avatar
8 votes
1 answer
2k views

Why do modern phone cameras apparently have three or even more different camera lenses in almost the same spot?

I saw this today: It's not the first time I see it, but I wonder what this is about. Why do they have three big what I assume are camera lenses? And what's the two smaller "spots" in the ...
Karanveer H's user avatar
1 vote
3 answers
176 views

Why do the "LINE OUT" connectors not seem to output audio, but "HEADPHONE JACK" does?

I have a "Clas Ohlson TCD-983WEC CDMP3". It's a cheap "multi-unit" music player bought maybe 10 years ago or longer. I'm using it exclusively for its (cheap) tape player, since my ...
J C's user avatar
  • 11
0 votes
1 answer
64 views

Is it possible that room noises could end up on the recording when recording audio from an analogue source?

I have a VCR with a tape cartridge playing in it. The video output (SCART/RCA) goes from the back of the VCR into my Elgato video capturing device's RCA cables. The Elgato device is then connected via ...
J. E.'s user avatar
  • 1
1 vote
0 answers
92 views

What are these mysterious switches on my old VCR? [closed]

I have a Samsung VX-306/EDI (VHS PAL) VCR bought in/from the 1990s. I have lost the physical manual and was unable to find any digital copy of it online (what a shocker...). Now I'm wondering what the ...
Z. Addonizio's user avatar
2 votes
1 answer
133 views

What version of Bluetooth does the Echo Show 5 support? [closed]

Title says it all. I can’t find the Bluetooth version, only that it supports Bluetooth. Also, forgive me if this question is off topic here.
Evan93's user avatar
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0 votes
1 answer
95 views

Is there such a thing as a modern-manufactured, flat, fake CRT TV? [closed]

CRT TVs were great, and an absolute must for all classic video games. However, it cannot be denied that it's impossible to buy a new CRT TV today, at least in any kind of normal store, and you rarely ...
M. S.'s user avatar
  • 1
8 votes
2 answers
2k views

Unknown metal-piece connected to the case of an iPod Nano 2

I disassembled an iPod Nano 2 yesterday and was surprised to find a round brass-coloured plate glued to the back. I didn't find any mention of it at the teardown over at ifixit.com, as they didn't cut ...
eugen_e's user avatar
  • 83
0 votes
1 answer
52 views

Does a stove which has started emitting heat on the non-circled areas have something wrong with it?

We have a electric stove which looks like it was designed in the late 1980s or early 1990s, and probably was made in ~1995. It has physical knobs that you turn around to change the heat for each plate....
J. D.'s user avatar
  • 1
1 vote
1 answer
409 views

Is using your mouth and lungs to blow away dust inside your computer somehow bad for the computer?

Bottles of compressed air are very expensive where I live. While it would be nice and ideal to have and do a "proper" cleaning, I've always used my mouth and lungs to blow air onto the dust ...
D. Madrueno's user avatar
1 vote
0 answers
44 views

How long can I reasonably expect my external USB HDDs and memory sticks to last?

I have a number of external USB HDDs (nearly all of them 2.5") in my fireproof safe. They are between 7 and 9 years old. (For a period of two years, I bought one almost every month until I had ...
Hanns Delucchi's user avatar
0 votes
1 answer
148 views

What has changed since the 1990s that made "LED lights" possible?

I keep seeing all kinds of objects now having small but very bright LED lights in them, seemingly never burning out, requiring almost no batteries/power, and extremely durable. I remember being a ...
Kaseen Thobe's user avatar
1 vote
2 answers
64 views

Is there no longer such a thing as varying quality of hardware for USB memsticks? [closed]

I'm trying to buy a new 128 GB memstick, for the first time in a very long time. It's going to store important files, and while I will have at least one "copy", I still don't want either of ...
R Domagas's user avatar
1 vote
1 answer
35 views

Is there yet such a thing as a "dynamic sheet of paper"? [closed]

I know about "e-ink", but I haven't heard anyone even mention that since like 2006 or something. I'm looking for essentially a single A4 (or "Letter" size) sheet of paper which is ...
Nehki S's user avatar
  • 11
0 votes
0 answers
27 views

Has there been any deliberate implementation of combinational logic soft error correction in any consumer-level product, like a CPU/microcontroller?

It is well known that many error detection, mitigation, and correction methods, such as parity or ECC, have been available in large memory banks, like for RAM, for decades now, and even in CPU caches ...
user29823's user avatar
0 votes
1 answer
66 views

How do I reduce the mains spike in a switched mode PSU?

I have a switched-mode PSU for a gaming laptop. It has a bad habit of burning out the switches on mains extension panels when I turn it on (two in the last four days). The turn-on surge is always ...
riemannzz's user avatar
  • 101
1 vote
3 answers
599 views

Why Sony headset's charging station doesn't charge other NiMH batteries rather than which came with it?

I've got a Sony MDR-RF4000 wireless headset, which is already 7 years old, so obviously its NiMH battery (Sony BP-HP550-11, basically a pair of AAA NiMH rechargeable batteries tied together) shows the ...
Megan Caithlyn's user avatar