I'm sure this is a stupid question, but I wondered. Why don't cell phones and other chargeable electronics charge multiple small batteries in parallel? The analogy is like this: * I have one cell phone with a large battery that takes 3 hours to charge. * I have three cell phones with small batteries that take 1 hour to charge. Why can't cell phones just have 3 smaller batteries and charge them all at the same time, and therefore make the charging faster?
What goes in an electronics technician's tool bag? [more inside]
Here are a couple of photos taken from inside our bathroom. I'm afraid I might seem paranoid, but we've been having an ongoing dispute with the neighbors who placed it there (which recently culminated in being forced to file a restraining order). Someone suggested it might be some kind of carbon monoxide or VOC detector, since they had accused us of letting smoke waft onto their property. But the window has remained closed thus so far, and there's something inside of it that glints like a camera lens when the light hits it just right.
I bought a few of these for a motorcycle project. I need to hook it up to a little arduino, but i'm used to breadboards, how does one hook this up? Do I need to solder these little connections? Btw, the project is to make custom signals tail lights for a motorcycle. I bought these hoping they would convert the 12v of the bike to 5v for the arduino.
I have $1400 to spend on a new computer. I have no idea what I'm looking for. Help? [more inside]
I want to start tinkering with electronics/mechanics/appliances, specifically stereo equipment (preferably vintage/obsolete). I have little experience and I've never thought of myself as one with a good sense of "electronics" or even "mechanics" nor do I have any kind of STEM background. What baby steps do I take to get started? [more inside]
I have an Arduino, and I want to make it do things. I gather that what I really want is a Raspberry Pi in addition to my Arduino. The trouble is, I don't know Python and my C and circuitry skills are severely rusty. So do you know of any online courses or physical books that will teach me all of this as a general subject of "making devices" rather than individual Python, C, and electrical engineering courses of study? [more inside]
I am after some good old collective internet wisdom on the best way to go about a LED light installation behind my headboard and bedside tables. Just wondering if anyone had done a similar project and could offer any tips, especially on the correct way that I should go about connecting the strips? [more inside]
Trying to run a DC motor with an Arduino UNO and a relay shield - need help with the code! [more inside]
Can anyone identify a manufacturer who makes these toggle switches? I'd like to get ahold of some, and want to know if they're still being manufactured, or, alternatively if there's a good source for them. This photo is of a Technics RS-263AUS cassette tape deck. Thanks for any help!
My desktop PC has taken a turn for the worst and after some troubleshooting I'm still not exactly sure whats going on. PC doctors of mefi - help! [more inside]
We just bought a Vizio E550VL LCD TV on Craigslist. We tested it before buying it, of course, and it worked fine; we brought it home and watched an episode of Game of Thrones on it, and it continued to work fine. The next morning when we turned it on, the screen brightness starting flickering badly, and a little while later the screen stopped turning on at all. When we opened it up we found this charred wiring (note blackened housing and brown spots on circuit board.) What should we do? [more inside]
I'm selling almost everything I own so I can fit everything that's left into my car and travel for a while. The inside of my car can get volcanically hot at times, and I'm worried about storing my MacBook and iPad there. What can I do to keep them as cool as possible? Buy a cooler they'll fit in? Do I need to worry about condensation in that case? Any ideas would be very welcome -- thanks!
So I managed to get myself a job in a busy factory as an electrically biased maintanance man and need resources to help me become more up to scratch with what im dealing with. [more inside]
My husband likes to take electronics apart and put them back together (cameras, smart phones etc.). Right now his setup is ridiculous: he works (mostly) over a big tupperware container to catch the screws that fall into it, unless they fall on the floor, and he holds the flashlight on his iPhone with one hand while trying to wrestle tiny screws into place with the other hand. There has to be a better way; this looks painful. what can i buy him to improve his setup (lights, magnifiers, other things i haven't thought about)? What do you use in your efficient and effective home repair shops?
So, my 15mo old daughter poured a cup of coffee in my 2011 Mac Book Pro, and now the keyboard and none of the ports work. I am trying to figure out what to replace it with, if anything (at the moment). [more inside]
Why does the signal keep dropping on my Wii? [more inside]
These are various .avi files from old which my player a Panasonic Blu-Ray DMP-BDT230 supposedly supports. It will 50% of the time but only show the picture and then a high pitch dog-level sound comes through speakers. It is connected via HDMI to TV with TV's audio output RCA to early 2000s receiver. [more inside]
My current house room setup doesn't make sense, and I'd like to move the media room to a different location. However, the only available wall for for TV/Xbox/Etc, is the wall that divides the kitchen and the living room; so the TV would be hung on the same wall as the microwave and stove, but on the other side, in a different room. (If that makes sense.) Is interference still a thing, or is most equipment shielded enough that this idea isn't a problem?
Is the control panel on my gas oven really completely fried after switching the breaker on and off? How can I prevent this in the future? [more inside]
My fiance sold and shipped some very expensive, heavy, one-of-a-kind electronics to an online friend overseas. They were damaged during international shipping. The purchase price was over a thousand dollars and the items are literally irreplaceable. Who is legally liable here? What are the ethics? We *cannot* afford to reimburse this expense. [more inside]
I have a refurb monitor that's starting to go bad: the screen will fill with vertical color lines that don't change once they appear. Cycling the power almost always fixes it, but it's starting to happen more often. There are three boards inside - which is the likely culprit? [more inside]
I'm trying to set up several micro USB charging stations in my house and car, and I'm realizing that I retain very little from 9th-grade Intro To Electronics. Set me straight on how current works? [more inside]
So - I need to epoxy some wire back into a tiny plug. The old one holding it was whitish. Can I use regular epoxy or do I need some kind that it especially made for electronics? Thanks
Recently got offered a new job in the area of electronic engineering (I think anyway!).... [more inside]
What are some good Arduino projects involving Christmas lights for someone new to microcontrollers? [more inside]
My mother-in-law's TV is out of HDMI ports. I need a switch and a cable. I can't order online-- I need to be here to set up, and leave early Monday. Best Buy/Radio Shack are last resorts. [more inside]
Recently I found a good deal on a direct drive DJ turntable which was manufactured for the japanese market. I know japanese consumer electronics run on 100V while US runs on 120V. I have heard conflicting things on whether this would be an issue. It seems like the turntable would likely run but I have heard some reports that this difference in voltage might eventually damage it. Is a power adaptor a permanent solution to this problem? Is a power adaptor even necessary?
A few months ago I moved into a new apartment, and decided to get one of these industrial shelving units - something like this to use as a desk/bookshelf/musical gear shelf. Everything works great, except when I plug my macbook into its charger and start typing. If my hands are on the aluminum body of the macbook and my wrists brush up against the metal frame of the shelving unit, I get a sharp shock, nothing too bad, but painful and annoying. [more inside]
I recently purchased the Iphone 6 and love using it, but the EarPods do not work well for me. Help me find an alternative. [more inside]
Hi - I'm hoping for a bit of help comparing two similar 7 inch tablets that are on sale this Black Friday. [more inside]
I just picked up an IBM electric typewriter from a salvage shop. However, as you can see HERE, there's something a little bit strange going on. Any electricians out there who can give me some insight? Thanks!
There are a ton of printed circuit board assembly companies in Asia. How do I choose one? [more inside]
I am thinking of getting a friend's old Realistic receiver (Realistic STA-65C, I think). I am not of the nature that I need an exact model replacement of the treble knob and am curious if there is a place online or a store like Home Depot or Radio Shack that might sell knobs that could fit or made to fit. I know eventually I may find one on ebay but don't need it to be a perfect match nor spend too much. [more inside]
I have acquired a gorgeous vintage record player, which I would like to either repair myself, or find someone to repair in the Chicago area. [more inside]
I was given a tablet demo unit from my workplace because we no longer sell this model. It's functional and great, but still has the old security base attached. It's a circular nub about 1" thick that fits into the cradle of the demo pedestal, and has wires coming off both ends of the nub. I can cut off the wires, but the nub is superglued onto the back of the device. What's the best way to remove it? Photos within. [more inside]
ElectronicsFilter: I would like to construct a box with 4 lights that work on a timer. I know lots about software, and little about hardware, please help steer me in the right direction. [more inside]
I want to place small red LEDs into the eye sockets of local statuary. What do I need to buy? [more inside]
I accidentally received a free Honeywell 1911i barcode scanner from Amazon. It’s worth a lot of money. They said I can keep it or donate it. What should I do? [more inside]
I have this USB DAC/headphone amp (which is great). I just started using the RCA outputs for a pair of powered monitors (also great). The problem is that the DAC switches between the outputs based on whether the headphones are plugged in. This makes sense, but it's annoying. I want to hack it and switch between them manually. Electronics whizzes, check my reasoning. [more inside]
I inherited this rice cooker but cannot figure out what buttons to use to make regular short grain Asian rice. I thought it was the large one on the right but the rice is gross and uncooked yet soggy. Can you help? I looooove rice and need to remedy fast. Thanks for your help. Can you tell me what all of these buttons mean? I can't find a mode number so I can't look up the operating instructions online.
Where can I find this Foxconn part (an HDMI socket) that appears to only be available in bulk from a distributor? [more inside]
I want to purchase a few elevator advertising touch screens. You know, those interactive touch-screens that display all kinds of adverts and slideshows. Problem is, I don't know where to get them. [more inside]
I have an idea for a half-and-half forearm tattoo (like this) where one half will be filled in such a way to represent computation, computers, electronics, artificial intelligence, something like that. Trouble is, I can't think of something appropriate that would work in a tattoo. Need ideas for this fill! Requirements and current ideas: [more inside]
I just gave all of my personal electronics an (accidental) bath. Are they all ruined? [more inside]
I need basically this. I'd rather order it from closer to home. My searches for this type of cable in the US haven't turned up anything, and I don't know enough about electronics to figure out what other names it might go by. I think it's a common type of cable so there must be something I'm missing. Thanks!
I want to learn how to build something like this. Starting from nothing, what kind of skillset will I need to acquire?
What device is to writing what the Kindle is for reading? Assume a Kindle is, for purposes of this question, electronic, single-purpose, efficiently designed, portable, small and stylish -- and not a tablet like an iPad or Nexus. The method of document storage does not matter.
Where can I buy blank plastic boxes for electronic gizmo projects? [more inside]