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Replacement knobs for old receiver - DIY or other?

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]
posted by chicaboom on Sep 13, 2014 - 6 answers

Vintage Record Player Whisperers Wanted

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]
posted by shaka_lulu on Sep 10, 2014 - 8 answers

Looking for source for specific Foxconn HDMI socket or something just like it

Where can I find this Foxconn part (an HDMI socket) that appears to only be available in bulk from a distributor? [more inside]
posted by Venadium on Aug 1, 2014 - 4 answers

USA seller of "twin screened audio cable" or "two core screened cable?"

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!
posted by univac on May 17, 2014 - 5 answers

Not that I'm going to do it or anything, but...

Is it feasible to take apart, modify, and put back together again a hair dryer so that it works in reverse, that is, become a small vacuum? I assume I would have to make the blower work backwards to become a sucker, and I would have to direct debris into a little sack and away from the blower and power source. If I were going to do it, what would I do? How much work would it be? How ugly would it be, assuming rudimentary skills and a home workshop? If it's impossible-- why?
posted by blnkfrnk on Mar 12, 2014 - 10 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

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

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

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

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

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

Please help me ID this TO-220-3 IC

What kind of IC is this? Picture shows a TO-220-3 IC with the label S9010, B5 and a manufacturer logo of a sort of stylized C. It is installed in the Q1 position so I assume it is a transistor. [more inside]
posted by KevCed on May 12, 2012 - 7 answers

New soldering iron! What should I make?

I am the proud new owner of a soldering iron. What are some good first projects? Must be cheap and at least marginally useful. Blinky lights are a plus! [more inside]
posted by Scientist on Mar 15, 2012 - 17 answers

Resistors in a circuit--does it matter much?

Noob electronics question: Can I replace a 3Mohm 1/2 W resistor on a guitar pedal circuit with a 3.3Mohm resistor? [more inside]
posted by sleepy pete on Jan 29, 2012 - 18 answers

Nerdy fun for kids in PDX

So I'm visiting my wife's family in Portland and just discovered that the electronics surplus wonderland known as "Wacky Willy's" went out of business several years ago. It was sort of like Archie McPhee's for Maker types. Are there other similar places that I can take my budding geek 12-year-old that are similar to Wacky Willy's? [more inside]
posted by craniac on Dec 22, 2011 - 8 answers

Ignoramus wants to learn how to fix a DSLR.

I want to learn how to personally repair a Canon 5D with an internal power problem. What resources should I look into in order develop this skill set? I do not care that this is silly, uneconomical idea. I am also well aware of the fact that developing this skill set will not be overnight. [more inside]
posted by Sticherbeast on Sep 5, 2011 - 2 answers

Help me replace a blown woofer for a Spica TC-60

How do I replace a blown woofer in a Spica TC-60 loudspeaker? The datasheet is here. I am generally capable, but don't know anything about building/repairing speakers. Can I get away with replacing just the one? Is there any danger of damaging the crossover (whatever that is)? The very nice guy from Madisound recommended a ScanSpeak replacement but how do I know if it will fit and/or work properly? If I'm reading the datasheet correctly, the original seems to be 180mm in diameter, and the replacement he recommended 170mm - is this a good idea? How can I tell if there's anything else I should try? What, if anything, do I seem to be overlooking? Thank you!
posted by jcrcarter on Aug 3, 2011 - 2 answers

Remixed electronics: can I make a working frankenphone out of these two broken 6820 phones?

Help me identify a mystery component from the board of one of two damaged/crippled Nokia 6820 phones and determine if it's possible for me to get one working Frankenphone out of the two. [more inside]
posted by weston on Apr 3, 2011 - 6 answers

Recommendations on synth DIY

I am looking for recommendations for DIY synth kits. I recently built the Weird Sound Generator and Voice of Saturn kits and am now looking for more to build. Does anyone here know of any similar noise-making PCB kits, or something else in general I should look into? Thanks.
posted by archivist on Feb 6, 2011 - 10 answers

Help me navigate the world of diy audio kits with respect to guitar amps!

I finally figured out the perfect gift to get the boyfriend but am having trouble finding what I want. Help me navigate the world of diy audio kits with respect to guitar amps! [more inside]
posted by joydivasian on Dec 10, 2010 - 6 answers

I want to lie to cars.

I need a little advice on an electronics project that I'm working on. [more inside]
posted by Jon-o on Sep 2, 2010 - 16 answers

Easy DIY electronics project for a teenager?

Easy DIY electronics project for a teenager? [more inside]
posted by Joseph Gurl on Jul 3, 2010 - 15 answers

Source for Right Angle PC Mount Potentiometers

Where can I order Alpha Single-Gang 16mm Right-angle PC Mount Potentiometers that are 100K log/audio taper?
posted by drezdn on Jun 28, 2010 - 4 answers

Toys for AI chatbot?

Help me make my talking deer-billy-bass-whatever toy engage in eerily logical conversation. [more inside]
posted by ollyolly on Apr 21, 2010 - 6 answers

Hollar when the train is coming :)

What easy technology solution can save me from waiting forever for an untimely train? [more inside]
posted by thankyoumuchly on Mar 12, 2010 - 10 answers

howto convert a BMP file to a gerber file for PCB fabrication

What's the easiest way to convert a bmp of a simple one layer circuit board into a gerber file? Or...into a circuit board, I'd like to get them fabricated by a company, not sure which one.
posted by Charlie Lesoine on Jan 13, 2010 - 3 answers

Suggest some online stores for DIY electronic gadget making.

Can you recommend some good stores like http://www.goldmine-elec.com/ and http://www.sparkfun.com/ I'm looking for little motors, gears, metal rods, rubber rollers/grommets as well as electrical components.
posted by Charlie Lesoine on Dec 3, 2009 - 20 answers

How to teach myself audio electronics

I'd like to teach myself electronics with a focus on audio. I'm starting with this book. What should I do/read from there? [more inside]
posted by Charlie Lesoine on Nov 24, 2009 - 11 answers

Electronic Catan

I want to create a customized Settlers of Catan board. For the purposes of this question, it could also be a custom Monopoly board. I want the pieces ( cities / hotels ) to light up when they are placed on the board. I know I would put LED's in each piece, but besides that, I am not sure if or how I could power up the LED's. I am not an electrical engineer, but magnets, watch batteries or inductive charging sound good to me. Help me make an awesome electronic board game!
posted by jasondigitized on Sep 4, 2009 - 8 answers

Help me wire a wireless doorbell switch.

Help me wire a wireless doorbell switch. [more inside]
posted by Big_B on Aug 12, 2009 - 5 answers

Inexpensive pre-fab thermistor probe?

I need a new thermistor probe for this temperature controller. The manufacturer sells these for $37 shipped. Is there a less-expensive solution? [more inside]
posted by hsawtelle on Apr 8, 2009 - 6 answers

Hooking a Chumby up to a Furby?

LazyHiveMind: What fun things can I do if I hook my Chumby up to a Furby? [more inside]
posted by rwhe on Feb 3, 2009 - 6 answers

Where are Some Great DIY Printed Circuit Board Layouts?

I have a medium-sized run of printed circuit boards that'd be most cost-effective for me to silkscreen/photo-etch at home. I'm pretty sure I got that part covered... lots of tutorials available [1, 2, 3, etc]. It'd be a shame, though, to build this setup and then not use it again, so I'm wondering where are some great repositories for (all types of) PCB layouts? Added difficulty: Would like reasonable descriptions of "what they do" and how the boards are likely to be employed. [more inside]
posted by jjjjjjjijjjjjjj on Dec 30, 2008 - 7 answers

Fix a loose connection without cutting the cord?

Is it possible to fix a power cord without replacing the plug? [more inside]
posted by backseatpilot on Dec 2, 2008 - 9 answers

How is this color-changing LED array being driven?

Electronics/LED Folks: I bought a few cheap, poorly-assembled LED color-changing orb-things and I'm pretty sure they're the coolest objects I have ever owned. I cracked 'em open, and damned if I know what is going on in there, but it looks simple/cheap as all hell. Help me figure it out, I'll post a build-log/parts list somewhere, and in short-order we can all be ass-deep in home-made, disarmingly sublime mood-lighting. [more inside]
posted by jjjjjjjijjjjjjj on Nov 18, 2008 - 28 answers

Help me identify a piece of electronics from a pinball machine.

What is this device that I found inside of a Williams Grand Prix electromechanical pinball machine from approximately 1976? [more inside]
posted by mmcg on Nov 8, 2008 - 18 answers

Rotary Dial Awesome-o Mobile Phone GO!

I have found someone who can build me a mobile phone out of a rotary dial telephone. But Sparkfun doesn't really have a one-stop shopping list. Help me decipher exactly what parts from this article i will need and also please recommend a good antenna I can use that will give me the best reception but also be cell-phone-tiny. [more inside]
posted by parmanparman on Sep 24, 2008 - 2 answers

Not-so-DIY

1. I'd like to take on a portable-electronics-building project. 2. I have none of the required knowledge. 3. ...? [more inside]
posted by jinjo on Aug 8, 2008 - 3 answers

This shouldn't be happening.

Help me diagnose repeated failure of my lighting dimmers. [more inside]
posted by jon1270 on Jun 26, 2008 - 20 answers

A + B = a trip to Radio Shack?

How can I build my own A/B/A+B speaker selector box? [more inside]
posted by harkin banks on Jun 17, 2008 - 10 answers

Help me build a simple intervalometer!

Help me build a simple intervalometer! [more inside]
posted by lord_yo on May 27, 2008 - 5 answers

Aurduino or Make Controller

I am trying to decide which to (learn) to use, The Arduino or The Make Controller Kit. Which should I choose as a first buy / entry level controller? [more inside]
posted by dylanSnow on May 18, 2008 - 8 answers

Homemade guitar amp filter

I built this mini guitar amp based on this circuit. But I used a 4 watt speaker rather than the 8 watts specified. What are the consequences of that change? [more inside]
posted by Grundlebug on Mar 17, 2008 - 8 answers

Simple, small, cheap accelerometer/LED?

I'm looking for a simple, small and cheap way of measuring acceleration. Basically, I want to make a set of LEDs light up if they are accelerated significantly, becoming brighter the faster the acceleration happens. [more inside]
posted by Zarkonnen on Nov 13, 2007 - 13 answers

Help me not screw up.

I'm going to embark on a stompbox-building adventure, and I'd like to know how much one can mess things up. [more inside]
posted by tmcw on Oct 21, 2007 - 13 answers

Homemade DVD server- Whats the best/easiest/cheapest way?

Homemade DVD server- Whats the best/easiest/cheapest way? [more inside]
posted by weiler63 on Jul 12, 2007 - 17 answers

How to connect internal TV speakers to audio system?

Connecting internal TV speakers to audio system. Is is possible? How could I screw up? The TV is already open and some wires disconnected. [more inside]
posted by Dataphage on Jan 27, 2007 - 8 answers

Apparently, it's best not to drop television sets.

I dropped my TV a few times, and now the color is messed up in a few spots. Is there anything to be done? [more inside]
posted by Afroblanco on Sep 23, 2006 - 6 answers

Recommend a book that will help me make simple electronics?

I want to learn how to make simple electronics, like LED controllers that I can hook up to a serial port. Can anyone recommend a book to get started with? [more inside] [more inside]
posted by krunk on Aug 29, 2004 - 13 answers

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