696 posts tagged with electronics.
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Thin, light, and 1080p laptop

I'd like a thin and light 1080p laptop. It does not need to be powerful, but it does need to be cheap. I'd like to spend about $300, but it must be under $500. The perfect machine would be something like a chromebook, but with a higher res screen than the ones I'm aware of. The resolution requirement trumps the thin and light requirements. [more inside]
posted by jsturgill on Jan 7, 2014 - 15 answers

What am I doing wrong with this wiring?

I am playing with an animatronic toy I got from a thrift shop. Before I started trying to hack it, there was a rocker switch that when pressed in one direction, made the head turn left, and when pressed in the other direction, made the head turn right. I have hooked this up to my arduino by replacing the switch with transistors, but the head now will only turn right. Without knowing exactly how the circuit board inside the toy works, is there enough information to figure out what I'm doing wrong? [more inside]
posted by lollusc on Jan 3, 2014 - 10 answers

Tablet piano instruction?

I have an electric, piano-weighted keyboard that I want to learn how to play. I can't afford lessons right now. It has MIDI in and out connectors. Is there a hardware/software combo that will take that MIDI out connection, plug it into an Android or iOS tablet, and provide a more interactive teaching experience? [more inside]
posted by jsturgill on Dec 23, 2013 - 4 answers

Need name of company in Richmond Virginia

Looking for the name of a company in Richmond, Virginia which makes electronics or radios and may or may not begin with the letter "C." [more inside]
posted by Ironmouth on Dec 17, 2013 - 13 answers

Arduino & other electronic project kits for a 10 year old boy

More gift advice needed! For a 10-year-old science geek with advanced computer and electronics skills for his age, I am looking for cool electronics project kits. He has an Arduino starter kit and has worked with that a lot. He has some soldering skills. He's into digital audio at the moment. He also has a Mac laptop and an iPad, in case it's relevant. Looking for things in the $75-150 range.
posted by spitbull on Dec 15, 2013 - 9 answers

How do I safely implement this one-off home electr(on)ics project?

How do I safely and (pretty) cheaply implement this one-off home electrics / electronics project? I have a low-wattage controller that will drive a high-wattage load having to do with the heating of water. I already have a GFCI extension cord that will stand between EVERYTHING and the wall outlet. The main complicating factor is that this is a single, custom-built thing so I need to use off the shelf pieces for a housing, etc. [more inside]
posted by Joey Buttafoucault on Dec 2, 2013 - 6 answers

AV receivers which split audio and video output

Are there AV home theatre receivers which do the following with input and output: [more inside]
posted by Blazecock Pileon on Nov 29, 2013 - 6 answers

Looking for a working Bakelite radio in the U.S

Aside from the standard stops ( etsy, eBay, etc ) where should I be looking to find a breadbox-sized, working radio from the 1930s-40s? Ideally Bakelite but not a deal breaker. Ideally shipping from the U.S? A period shell over modern electronics/cords is fine.
posted by The Whelk on Nov 28, 2013 - 8 answers

I think I need a UPS? If so, which one?

When the heater in my place (convector) cycles off, my TV goes black for a second or two. I worry a lot about what this is doing to all of the electronics using outlets in the same wall as the convector. Do you think I need a UPS, and can you guide me through the process? Details inside! [more inside]
posted by theatro on Nov 22, 2013 - 10 answers

Can I put a TV in my window so I can watch while I watch?

What are the downsides, or dangers to my TV, of putting my TV in a bay window? [more inside]
posted by Naib on Nov 18, 2013 - 7 answers

Ideas and advice for a DIY electric bike on the cheap.

For a long time I've thought that it would be a fun project to put together an electric bicycle. However I've been stymied by the cost and questionable quality of the existing kits, and the complications and compromises of the various DIY methods that are out there online. I have some ideas for how to go about making a cheap and simple electric bike, but I'll be the first to admit that I'm nobody's idea of an engineer so I thought I'd run some things by y'all and see what insights you have. [more inside]
posted by Scientist on Oct 29, 2013 - 12 answers

I want to learn about electronics, not plumbing.

What are some books (or other resources) that would help me understand electricity and hobbyist electronics without a hydraulic metaphor? [more inside]
posted by ddbeck on Oct 9, 2013 - 10 answers

Baby monitor from webcam? (portable screen connected to wi-fi?)

We have a foscam webcam with night vision and the works. We can access it via wifi on our phones and computers, but want a dedicated screen to use as a baby monitor. Portable and/or plug-in... what are our options? Thanks!
posted by Chris4d on Sep 22, 2013 - 5 answers

How to replace the audible alarm in a 9v water leak detector with an led

I have a 9v battery powered water leak detector (this one: http://www.glentronics.com/water_alarm.htm ). I'd like to open it up and replace the audible alarm with an led. How do I do that? [more inside]
posted by atm on Sep 19, 2013 - 5 answers

What do I need to connect my smartphone to a single speaker?

This should be so simple. I bought an classic but broken 1950s console TV to turn into a bar. I pulled the tube and all the electronics, except the speaker. Now I want to add a small amplifier to which I can connect a smart phone or iPod and which will power the single speaker. I bought this neat little stereo amp, but it turns out you can't just mash the lefts and right outputs together and attach them to a speaker. So what do I need to do this? Difficulty level: No electronics experience of specialized tools.
posted by LarryC on Aug 22, 2013 - 18 answers

What are these holes called?

What are these mounting holes called? Is there any kind of plate or bracket I could buy that would allow me to retrofit them onto a device that does not have them, without drilling into the device?
posted by cosmic.osmo on Aug 11, 2013 - 6 answers

How to choose a ventilation fan and estimate power usage for a costume h

I have a costume helmet that I'd like to have a forced air ventilation system for. I would like a small, low power fan (maybe from a laptop or small computer?) that I can run on batteries. [more inside]
posted by polywomp on Jul 28, 2013 - 3 answers

Carry-On Travel Bag for Lots of Various Electronics Items?

I'm looking for a travel bag that will hold the following: 15.6" laptop, 10" DVD player, 9" tablet, small camcorder, Kindle e-reader, mp3 player, various cords and power adapters. Any and all recommendations welcome. Bonus points if I can purchase it with 2-day shipping.
posted by Bushmiller on Jul 17, 2013 - 9 answers

new soldering iron tip, or new iron

I have a Weller SP23 (23W) soldering iron which I've used for a couple of small through-hole kit projects. It's got a chisel tip which seems to have a ~4mm wide edge. I think I want a smaller chisel tip (maybe 2 mm) or maybe a new, versatile soldering iron. [more inside]
posted by amtho on Jul 14, 2013 - 5 answers

Do I need a potentiometer?

We have an alarm for a door that sounds constantly while the door is open. It is run from a 9v transformer that plugs into the wall and the circuit is triggered with magnets on the door. I would like to install volume control for the alarm. Is the correct device a potentiometer? If so, how do I select the correct one? Thanks!
posted by lake59 on Jul 1, 2013 - 10 answers

What household electronics should I be concerned about?

Dig around on the internet and you'll find plenty of people saying that cell phones are unsafe, microwaves are unsafe, wifi is unsafe, cordless phones are unsafe... how to make sense of what's legitimate and what's crockpot paranoia? Has anyone any advice to put me at ease (or ill at ease)?
posted by malhouse on Jun 16, 2013 - 18 answers

Building/Buying a Digital Timer

I teach Physics and I would love to have a large, easy-to-see digital timer that would allow me to time various demos (i.e. pendulum swinging, ball falling, etc). I've found basically exactly what I want, but it costs $460!! Can it be bought/built for cheaper? Requirements below the fold. [more inside]
posted by Betelgeuse on May 31, 2013 - 16 answers

This is what happens when chemists have to do electrical engineering

What's the name of this circuit that I need to build or buy? [more inside]
posted by kagredon on May 30, 2013 - 18 answers

Modular Optical Sensors

In my previous question about photo/optical detectors I received a LOT of great advice and I'm back for more. [more inside]
posted by nickerbocker on May 14, 2013 - 4 answers

Buying electronics on Craigslist

Should I buy a TV off of Craigslist? [more inside]
posted by triggerfinger on May 2, 2013 - 12 answers

Fixing a DDR pad: irritating flex cable edition.

It looks thusly. My issue is that, despite the fact that it was originally barely taped down at all, I am unable to successfully, reliably reattach it using the same method. ("it" in this case being the printed black strips on the left). I am reasonably sure that lack-of-contact is my problem, because if I physically hold the cable to the board, it will reliably work when I push a button. Best I can do is that sometimes, after putting it all back together for the Nth time, one button will work. Maybe other buttons on its side will work, maybe not. Maybe it'll work for a few presses and then quit. The cable looks fine, the board contacts look fine, no amount of scotch tape is helping me out here. How do I affix these suckers but good?
posted by curious nu on Apr 19, 2013 - 7 answers

Adaptor / converter plug US to NZ

In a few days, I leave on a trip to New Zealand. New Zealand, apparently not being the most popular destination from SF or the US, in my online and storeside research, I have received no less than 6, often contradictory, combinations of answers to exactly what peripherals I need to have in order to charge my phone [though that most often will be trickle charging off of the laptop], run my laptop, and use my hair styling instruments [should I deem to do so.] I do not need to use them all simultaneously, but two at a time would be ideal, if not requisite at times. Can anyone explain to me exactly items I need to purchase and what that setup should look like in order to avoid frying my electronics? Thanks! FG
posted by Frisbee Girl on Apr 14, 2013 - 14 answers

Help me understand the electronics in my doorbell

I'd like to hook up a small raspberry pi project to my apartment's doorbell. I've taken the case off to take a look at the wiring and it looks pretty simple, but I have some questions about it; apart from some breadboard experiments I'm an complete newbie to electronics. [more inside]
posted by whir on Apr 4, 2013 - 5 answers

What's the easy way to get 12V power and ground to test some car parts?

I've got some car parts I'm selling on eBay, and I need to hook them up to power in order to check a few things and make sure that they work. [more inside]
posted by iknowizbirfmark on Apr 3, 2013 - 12 answers

Looking for cool electronics building kits

I've been building guitar pedal kits from buildyourownclone, and it's been great fun. I'm running out of pedals I want to make for myself, and am looking for other projects, like this stereo tube amp, and maybe this sous vide. Can you recommend more electronics projects (preferably kits, so I don't have to scrounge for parts) that are cool and look good at the end? [more inside]
posted by Admiral Haddock on Mar 21, 2013 - 9 answers

Suggest Electronica Suggestive of Electronics

I like songs that evoke images of circuitry, complexity, and digital processes. What are some songs and artists that convey this feeling? [more inside]
posted by dephlogisticated on Mar 18, 2013 - 24 answers

Digital Electronics: Keeping a logic level high or low for one minute

I want to use a timer (minimum on time is one minute) to turn on my coffee maker. The ON-OFF button on the coffee machine is a momentary contact push button which is read by a logic board. Can I use the (isolated) relay contacts on my timer to close that push button for one minute, the minimum on-time of my timer? [more inside]
posted by mbarryf on Mar 15, 2013 - 6 answers

best sound system for hearing movie dialogue

Ever since the DVD age began, I've noticed that music and sound effects in movies are always WAY louder than the dialogue. It's really annoying. Will a properly configured surround sound system fix this? What is the right way to set up surround sound speakers? Are sound bars any good? [more inside]
posted by Afroblanco on Mar 11, 2013 - 12 answers

What's the best e-reader for me?

I know pretty much nothing about the e-reader market right now, but I'm thinking about taking the plunge. Given my particular requirements, what is likely to be the best e-reader for me? [more inside]
posted by Scientist on Mar 7, 2013 - 35 answers

Securing Various Electronics in the South Pacific

What would be the best ways to secure multiple laptops, smartphones, cameras (physically, and also to catch thieves) in a "rustic" foreign country... keeping in mind I need to fit everything in luggage or fashion it out of raw materials in country. [more inside]
posted by DaftMythic on Feb 28, 2013 - 6 answers

Cell phone repair trouble

I'm trying to fix my phone. How do I deal with a very tiny, hard to get at screw with a stripped head? [more inside]
posted by delezzo on Feb 27, 2013 - 4 answers

Warranty providers show earlier purchase dates for Amazon electronics?

I've had this problem twice now: I purchase an electronic item from Amazon and when I call in for service under warranty, I'm told that their records show a different, much earlier purchase date. [more inside]
posted by ziggly on Feb 27, 2013 - 11 answers

Need help restoring bricked Verizon Galaxy Nexus

My rooted verizon galaxy nexus won't boot and I need help recovering it (more inside) [more inside]
posted by mattholomew on Feb 24, 2013 - 3 answers

me want magic screen box

I would like to purchase an off-brand tablet computer from a discount electronics website. I know nothing about components or specs or anything- the only info I have to go on is bigger number is good. Please help me. (sorry but this post got way too long, you've been warned.) [more inside]
posted by FirstMateKate on Feb 22, 2013 - 9 answers

Looking for the perfect iPad 4 case

I just bought an iPad 4, and (since I rarely spend this much on myself) I'm really paranoid about taking care of it. All the special snowflake details inside... [more inside]
posted by JoanArkham on Feb 21, 2013 - 12 answers

What soldering iron should I buy?

I'm starting to mess around with electronics as a hobby and need to buy a soldering iron. But which one? Bonus question: a cheap, effective multimeter? [more inside]
posted by Merzbau on Feb 17, 2013 - 24 answers

Do I need to replace the whole radio in my car?

I have a 1995 Toyota Corolla Conquest who's factory standard radio has just died (I think). It made a slight noise last night and cut out, and is now just flashing 01:00 on the clock with no buttons responding at all. I thought maybe the fuse had blown so I checked the radio fuse, but it doesn't look to have blown (something I suspected as a time keeps flashing on the display and I thought a blown fuse wouldn't allow any electronics to work). Also the cigarette lighter still works and that is connected/part of the radio fuse. [more inside]
posted by sunshine arakhan on Jan 31, 2013 - 9 answers

How to get a plastic case made for a prototype product.

I am making a prototype of a consumer electronic device, the final product will be housed in plastic. I want to get a case made for the prototype that will resemble the final product. The case design is nothing complicated, essentially a rectangular box with some rounded corners and some holes for buttons, etc. I have designed the look of the outside of the case in adobe illustrator (top, bottom, front, rear and side views). The case will have a top shell and a bottom shell that fit together. What is the best way to go about getting maybe 2 cases made for prototypes? I am thinking either cnc or 3d printing, but I don't know what the best route to making a 3d model is from adobe illustrator or anything...
posted by Charlie Lesoine on Jan 18, 2013 - 16 answers

Please help me fix my iPod!

My wonderful iPod, going on nine years now, seems to have finally gotten to the point where I can't fix it anymore. I've replaced the hard drive, battery, hard drive cable, and logic board, and yet all it does is turn on, show the Apple logo, and turn off, repeating over and over. What else could be wrong, and how can I fix it? This is a B&W 4th gen iPod, originally 40 GB.
posted by reductiondesign on Jan 17, 2013 - 4 answers

Why are my headphones not playing vocals?

I have a pair of Monster Inspiration. I'm trying to play Madness by Muse but if I plug the headphones completely into the iPod or computer, I can't hear the vocal parts at all. If the jack isn't completely in, then I can hear it perfectly. Why is this happening?? [more inside]
posted by cyml on Dec 27, 2012 - 5 answers

Need a hobbyist electronics shop in Toronto

Where in Toronto can I buy small cylindrical rechargeable 3.7V Li-ion batteries like the UltraFire, hopefully at a reasonable price? (or maybe they were 3.6V, I can't recall) [more inside]
posted by PercussivePaul on Dec 23, 2012 - 5 answers

More than one color to resistor number, what to do?

Resistor color coding (the electronic color coding) has more than one color combination to resistor value. How do you know which one to use? [more inside]
posted by tmcw on Dec 23, 2012 - 4 answers

How to watch Yogaglo on my TV?

I want to watch videos from a yoga website (Yogaglo) on my TV. The tools I have available to me are: MacBook, xbox 360, and Apple TV. Can I make it happen? [more inside]
posted by Anonymousness on Dec 22, 2012 - 5 answers

Need help finding a small, cheap, Arduino-ready solenoid valve or pump assembly

I need some help building a gadget with an Arduino board. Specifically, I need help finding a way to dispense very tiny quantities of fluid (10 μL) once an hour. The valve assembly is the part I'm having trouble with... [more inside]
posted by dialetheia on Dec 12, 2012 - 14 answers

Selling a used iPad - need tips

How should I price a used iPad 1? [more inside]
posted by DMelanogaster on Nov 29, 2012 - 10 answers

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