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]
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!
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)?
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]
What's the name of this circuit that I need to build or buy? [more inside]
In my previous question about photo/optical detectors I received a LOT of great advice and I'm back for more. [more inside]
Should I buy a TV off of Craigslist? [more inside]
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?
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
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]
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]
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]
I like songs that evoke images of circuitry, complexity, and digital processes. What are some songs and artists that convey this feeling? [more inside]
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]
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]
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]
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]
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]
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]
My rooted verizon galaxy nexus won't boot and I need help recovering it (more inside) [more inside]
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]
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]
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]
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]
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...
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.
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]
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]
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]
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]
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]
How should I price a used iPad 1? [more inside]
Help me find the perfect Christmas present for my "Maker" dad - ideally it would be an set of plans on how to craft something from scratch, rather than a kit of physical parts. [more inside]
I have a Sony flatscreen TV: KLV-26HG2 LCD WEGA Color TV. It is a couple of years old. I would like to use Apple TV with it, but the Sony lacks the HDMI port that I need. Is there some sort of device that I could plug into the Sony that would have the HDMI port on the other end, so that I could then plug that into the Apple TV?
Help me find a device (or two devices) that will take pictures, and then easily convert these pictures to PDFs. Alternatively, persuade me to buy an iPad! [more inside]
Pls recommend an electronics timer that can run for a minute, shut down for a minute then restart..and continue looping that pattern.
Pls recommend an electronics timer that can run for a minute, shut down for a minute then restart..and continue looping that pattern. [more inside]
I have a design for a new keyboard. Any ideas/advice on where to look for help with the circuits, driver programming and anything else I'm forgetting? [more inside]
What (European) plug adaptor do I need for this plug (attached to a set of fairy/Christmas lights)? [more inside]
I messed up my travel packing, and I now need to buy a charger for a Canon S95 camera battery in St. Petersburg, Russia. Is there any place where I could get one for a reasonable price? I'm staying downtown.
My subwoofer and amp both respond to the other's IR remote control. [more inside]
Recommended PS3 repair specialist in Vancouver, Canada? [more inside]
Your best hacks for cleaning filthy items such as computers, electronics, tools? [more inside]
Snail trails on Garmin Nuvi 255W. When out and about this device is now making pale blue 'snail trails' on the map tracking the car from A to B. It is working as it should otherwise. Does this mean that the device is on its way out? I checked some forums but could find any mention of this bizarre behavior.
Can I just take the guts out of my old Mac Pro and put them in my new Mac Pro? [more inside]
My wife's birthday is coming up in early September and I need help finding a birthday present Fast as I'm going to be tied up the next couple weeks. She likes "toys" like remote control cars, helicopters, preferably that she can build herself. I got her a helicopter last year and a remote controlled car kit already so those ideas are out. She has a basic arduino kit and is always looking for a new project. She also likes cool gadgets for cooking, grilling. And she's into all kinds of music. She has an iPod, iPad, a Mac, a PC (several, actually). I'd like to keep it under $150 if possible. Your ideas would be most appreciated!
I would like to learn more about electronics and circuitry by making a LED light panel. I have questions about how to calculate the number of LEDs I need, soldering, and how to diffuse the light. [more inside]
I need advice choosing electronic device/s to perform 2 different tasks (e-books and streaming music from an external HD to Surround sound receiver) [more inside]
I'm interested in making a strong faraday cage device to protect my stuff, one that is walk-in. [more inside]
I have an Olevia LCD TV bought in 2008. For about a week, it would have no sound on any input after being turned on but a quick power cycle would fix it. Now it's stone-cold dead. No glowing LED on the power button like normal and it is definitely plugged in properly to a live outlet. What should I do now? [more inside]
I'd like a splitter/dongle that I can plug an HDMI cable into that will pass video onto a monitor, but will allow me to plug headphones in to capture the sound. Does something like this exist? [more inside]