I'm sick of attending rallies and protests where the speakers are talking into an under powered megaphone and no one past the first row can hear. I'd like to purchase a nice, powerful, somewhat portable PA system to share with progressive groups in my city. I need your help since I know a fair amount about electronics but not much about audio. [more inside]
I just arrived in Krakow from Australia. My luggage did not. Insurance will cover replacement of everything if it hasn't turned up after 8 hours, which will be 5pm. I desperately need clean clothes, a laptop charger (Acer) and a phone charger before tomorrow as I am teaching a workshop. Have located places for clothes open until 10pm. What about the chargers? I am in the Old Town. [more inside]
I will be shipping a car in the US and this is estimated to take 4-6 days in an open transport. I will leave some things in the trunk (yes, I am aware it can be stolen). Since it is summer weather, the car may be potentially on the top, so it will be subject to significant heat, I wanted to ask if things such as hard drives and electronics will make it through the trip. Thanks.
I'd like to get a little bluetooth speaker that I can keep in my bag, for all-purpose music listening. What can you recommend? [more inside]
I've got a 1970s Nikko STA-5050 receiver/amp with tape, aux and phono inputs. Nowadays aux and phono seem to be used interchangeably but I know they used to be different specs. [more inside]
Please help me understand electricity and electronics. I have read the water analogy numerous times but I still can't quite grok it. Like "Ummm, Where does the water go and does it evaporate?" I have started tinkering with a Raspberry Pi and would love to build more complicated circuits with capacitors and transistors. [more inside]
I have a Gene Cafe coffee roaster that appears to have a dead motor (receives 12V, doesn't turn, shaft is frozen even with gear box removed). The company sells a replacement motor for $39, plus shipping that brings it to almost $50. I have a strong suspicion that this motor should cost around $10-$15. [more inside]
I have an old laptop to get rid of. How to best get a few dollars out of this? [more inside]
I want to buy an American Rock N Play (baby bouncer) that has a plug. Will it work here if I use a travel adaptor, or will it start smoking and explode? I copied this info from the manual "Requires an AC adaptor (input 120 - 240 VAC, 50 - 60Hz, with an output of 8 VDC) for operation (included)" [more inside]
I'm looking for a way to connect to standard 0.1" pitch PCB headers directly on the PCB without soldering in the header pins. Is there any kind of spring or barb-type contact designed specifically for this purpose? [more inside]
Our TV, a stately Sony Trinitron that's served us since 1999, is dying. We need a new 42 inch-ish TV. I have no idea what to look for in this new flat/plasma/HD market. All I want to avoid is that godawful HD thing where old movies look like cheap soap operas and everything is too sharp and flat. No interest in a smart TV or 3D or anything like that. What should I buy to make our media diet of old movies and Netflix TV shows look the best?
I'm looking for an internationally recognised ISO or IEC style standard or certification, against which I can have an electronic device tested and cleared for use. The temperatures involved are high, but not extreme. The device will be used within a metal enclosure in the Middle East. [more inside]
I've just moved into a new (to me) house. (The house itself is old and quite funky.) I brought with me my extant Macbook Pro (most-recent vintage). I'm finding that when my computer is fully charged and the charging cable is plugged in (green light), the house lights flicker. [more inside]
I enjoy building electronic kits, and am looking for a new one to work on. Ideally, I would like a reasonably complicated and advanced kit that will be more than an evening or two of work. Any recommendations?
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]