28 posts tagged with circuits.
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Why is this device shorting out my power?

Why would using an American electrical device on European voltage cause it to short out circuits at home when I plug it in again after coming home to the US? [more inside]
posted by anonymous on May 18, 2015 - 8 answers

Fun experiments with an electronics kit for a 7 year old

I would love some suggestions for science experiments with the Cambridge BrainBox electronics kit. [more inside]
posted by snarfois on Mar 7, 2014 - 7 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

My brain is resistant to learning circuit analysis. Get it? Resistant? Like a resistor? Ahhh hahaha! Help.

I'm struggling in Electric Circuits 1 - particularly with analyzing series-parallel circuits, thevenizing and superposition. Before I look for a tutor, can anyone suggest some resources to learn it myself? [more inside]
posted by SampleSize on Oct 31, 2012 - 5 answers

Is this thing going to kill me?

I want to get a voltmeter. I think that is what it's called. Can you recommend one? [more inside]
posted by A Terrible Llama on Sep 3, 2012 - 12 answers

Help Me H4x0r My Xmas Lights?

I bought a few strands of cheap LED Xmas lights this year. They include a circuit box with several settings to make the lights flash in different patterns. The circuit box resets itself (to a new annoying setting) each time the lights are unplugged or when it shorts out in the rain, and I also suspect the box is the product's "built-in expectancy" (since otherwise LEDs might last too long to be profitable. Can I bypass the box? [more inside]
posted by Shane on Dec 21, 2011 - 8 answers

Need electrical help.

Just moved into a new apartment with older electric service. I have a few related questions about how my wiring works, and I'd greatly appreciate your input. [more inside]
posted by Admiral Haddock on Jun 6, 2011 - 7 answers

Ideas for an exciting (and difficult) electronics project

What are some reasonably complex and conceptually interesting electronics projects that I can make for my class? [more inside]
posted by cognitio on Mar 14, 2011 - 5 answers

How I make thing that do thing?

How I make thing that do thing? I saw this awesome post on Metafilter the other day. [more inside]
posted by kbanas on Mar 1, 2011 - 5 answers

Circuit/Battery combos for driving a single 5mm LED

I'd like to use a single 5mm UV LED (3.4Vf, 20-25mA) to charge a daub of glow-in-the-dark paint. It only needs to be lit around 1 minute of every 10 (or 6 seconds of every 60), and only when the (room) lights are out. What battery/circuit would be most economical to operate, and require the least-frequent battery changes? [more inside]
posted by jjjjjjjijjjjjjj on Jan 18, 2011 - 6 answers


I have a lot of (old) ICs Integrated Circuits. (Also, crazy piles of capacitors and resistors, etc. but let us concentrate on the ICs.) Is there a website where an average citizen with these items can sell them to buyers? I fear they would just get lost buried or unseen on "ebay", even moreso on "craigslist". SeekIC.com seems like the kind of site I am after, but I would like to sell to buyers in the USA. [more inside]
posted by shipbreaker on Jan 2, 2011 - 8 answers

Best mixtape for overload circuits?

Help me compose a workout tape. [more inside]
posted by Biru on Jun 26, 2010 - 6 answers

How do I learn basic electrical safety?

How do I learn basic electrical safety? [more inside]
posted by ollyolly on Jun 21, 2010 - 6 answers

Simple Thévenin equivalent?

What is the Thévenin equivalent of this circuit? [more inside]
posted by PuGZ on Jun 14, 2010 - 6 answers

Synthfilter: Sequential Circuits Prophet 600, keys not firing issue

Synthfilter: Sequential Circuits Prophet 600 giving me problems: keys not playing notes, but silicone contacts are clean and working. Looking to be directed to the right person/place/forum to ask or maybe someone here can help [more inside]
posted by Charlie Lesoine on Aug 31, 2009 - 3 answers

Circuit Builder in Minneapolis

Circuit builder in Minneapolis area? [more inside]
posted by ian1977 on Aug 5, 2009 - 3 answers

BF laid off! Can't hire electircian, plenty of time no money.

Wiring question: What is this crazy non-standard switch I need? [more inside]
posted by stormygrey on Jan 30, 2009 - 16 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

Fun circuitry projects?

What are some fun, simple electric wiring projects I can try? [more inside]
posted by Deflagro on Jun 14, 2008 - 11 answers

DIY photolithography

DIY photolithography: has anyone ever tried to etch their own high-resolution PCB layouts or electrode patterns? [more inside]
posted by Krrrlson on Feb 24, 2008 - 6 answers

I need a Magnetic and Photbeam Sensor!

Can you show me a photo beam sensor or a magnetic sensor that is close to the size of my pinky? [more inside]
posted by kaozity on Dec 3, 2007 - 8 answers

Timer Troubles

I'm making a timer for skateboard racing and need some help. Does anyone have some advice on wiring simple circuits to lend? [more inside]
posted by infomaniac on Jul 6, 2007 - 8 answers

Capacitor Connected Directly to Voltage

Can you connect a capacitor directly to a voltage source? [more inside]
posted by stuffedcrust on Apr 5, 2007 - 16 answers

Book recommendation on Digital Circuit Design

I need suggestions for a good book that covers digital circuit design (specifically practical design using MSI/LSI TTL, PLD's, CMOS, FPGA, etc. [more inside]
posted by beammeup4 on Sep 21, 2006 - 2 answers

Black magic oven?

Why couldn't I cook anything last night? Electrical problems? Climate? Black magic? [more inside]
posted by ducksauce on Aug 3, 2006 - 10 answers

Help me build a relay & timer electronics project please.

I'd like to trigger a relay that momentarily closes a switch based on the voltage of another wire. Maybe. I think. Please help me with this basic (I hope) electronics project. [more inside]
posted by odinsdream on May 14, 2006 - 6 answers

Where can I find "modified" inkjet printers?

Scientists (and others) are using modified inkjet printers to print a wide range of really nifty things, such as working electronic circuits, 3D architectural models, and living tissue like organs and skin. My question is, do you have to modify one yourself, or are they for sale? Where would I get an inkjet printer that was capable of printing out a layer of resin or wax or whatever? The only one I can find is the kind that prints out edible birthday cake photos.
posted by RylandDotNet on Mar 26, 2005 - 9 answers

Art Needs Science

Art student requests technical advice of electrical engineer (or similar) for electrical components in a sculptural installation. [details within] [more inside]
posted by evilbeck on May 7, 2004 - 5 answers

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