Instructables: question - technology - featured Thu, 14 Dec 2017 13:35:29 PST BLOX v1.01 I need to buy or fabricate a strong crankshaft for a strandbeest-like glass robot. bandhudunham I'm making a walking robot out of glass based on Theo Jansen's strandbeest leg design. Fabricating the crankshaft has proven an odious challenge. I'm looking for a source where I can buy either a complete crankshaft to my specs or parts from which to fabricate my own. It needs to be about 30" long, ...
By: bandhudunham

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Sun, 1 Feb 2015 14:43:00 PST
Input problem with OpAmp-controlled ZVS Induction Heater DELETED_Electorials Hello, Idea: I'm trying to build a circuit which uses an OpAmp to drive 2 mosfets, which power the LC tank of an induction heater. The idea is to detect when the voltage over the LC tank crosses zero, and at that voltage I would make the 2 outputs of the OpAmp change states from fully on, to fully ...
By: DELETED_Electorials

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Thu, 5 Jun 2014 08:12:11 PDT
How do I make a chain rotating around 2 gears complete a single rotation in exactly 60 seconds? RayGroot Hello everyone, I'd like to start off by declaring I am new to this website and have little understanding of technology as of yet. If my question has been answered before I apologize, but I haven't been able to find it in the forum. I've recently started tinkering with 3D printing as a bit of a ho...
By: RayGroot

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Tue, 21 Jan 2014 13:00:31 PST
CANON MP270 series printer pwede ba syang gamitin sa advantage at disadvantage..tnx jeromep
By: jeromep

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Thu, 3 Oct 2013 02:07:05 PDT
Motherboard replacement capacitor?? XP1 I have an Asus M3A79-T Deluxe motherboard I recovered, and one of the capacitors looks to be ripped out of place. Does anyone know where I can buy or find the correct replacement capacitor? I have identified which capacitor it is I just am lost on as to where I can get another one. It has this on t...
By: XP1

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Tue, 21 May 2013 19:12:56 PDT
Problems with logic(NAND) gates? Strontium I MADE a circuit that basically detects when an IR beam  is cut using a LM741 opamp .AS shown in the schematic i've connected the output of the opamp to the  two transistors (which is a nand gate) ,so when the beam is cut the output of the transistors should be high but instead the led at the collec...
By: Strontium

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Sun, 19 May 2013 02:12:59 PDT
How can I create an electromagnetic field strong enough to attract metallic objects of about 8-6inches from me? Emmanuel Caster Trying to see how I can upgrade my  magnetic glove by increasing the strength of the electromagnetic field around it presently I can attract objects just 2-3 inches and by calculation if I increase the voltage to 18v from 9v but it would result into I^2R loss besides if I can successfully increase t...
By: Emmanuel Caster

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Sun, 5 May 2013 14:14:33 PDT
Linpack Benchmarking on PVM with CUDA? danielemur I'm working on a project comparing the performance of PVM and MPI in GPU accelerated clusters. Naturally, I turned to the defacto standard for computer cluster benchmarking, LINPACK. The problem I'm running into is finding a version of LINPACK for PVM. It does exist somewhere because there are perfo...
By: danielemur

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Wed, 20 Feb 2013 15:52:15 PST
How can I add a second hard drive to my computer? bofthe951 I recently bought a computer that uses a SATA hard drive, I would like to add a second hard drive inside the tower. I have a few SATA plugs available but my issue is that it seems that there is only one slot for a hard drive. I would like to have it internal and hopefully not look like crap. Is ther...
By: bofthe951

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Tue, 19 Feb 2013 00:40:51 PST
Can anyone help identify two components? Thoughtninja This board is from an old Barbie piano I'm fixing for my aunt. In order to further troubleshoot it I need to figure out what these are. They are indicated by the two arrows. Edit: Just wanted to add that I have attempted to google the codes on the two and it came up with nothing.
By: Thoughtninja

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Tue, 19 Feb 2013 22:07:52 PST
does anyone know how to connect this cirocomm gps module ? rastactivist there is  a 8 pins connector with no indication at all  :-(
By: rastactivist

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Sat, 15 Dec 2012 09:50:24 PST
Need help diagnosing my non-working gas wall heater.? Herdo Hello, I live in Arizona so we just tried to use our gas wall heater for the first time tonight (hasn't been necessary before now).  This is the type of heater we have installed in our hallway/bedroom.
By: Herdo

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Sun, 11 Nov 2012 06:15:47 PST
Amplifying load cell signal with AD623 problem! Chris414 Hello folk! I am having some trouble with this. I have set up the circuit. Thing is, when i put a 1K resistor between pins 1 and 8, i am supposed to get a gain of 100, instead i am getting a gain of 50. If i put 500ohm resistor, instead of getting a gain of 200, i am getting a gain of 100. What is g...
By: Chris414

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Fri, 9 Nov 2012 03:16:59 PST
Connect a Sketch WWC This is a People counter, well hope to be if working.ha. Lazer across a doorway hitting a LDR. The 4 digit 7 seg display counting up 1 each time a person breaks the beam.  As of now i  have a counting sketch from the Sparkfun example. It is counting up 0 to 999 and at the same time i have an LDR re...

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Mon, 1 Oct 2012 19:17:22 PDT
Does it matter how a coil is wound? Morgantao Hi everyone, Take a look at the illustration attached.  Is there any real difference in values between the four winding types? *** Assuming same core, same wire gauge and same number of windings on all 4 primaries, and all 4 secondaries *** A) Both primary and secondary are wound TOGETHER. B) prim...
By: Morgantao

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Thu, 27 Sep 2012 12:35:04 PDT
What is this tool? bajablue I'm cleaning out my junk drawer.  This whatever-it-is is going to the recycling center if I don't foresee having a use for it.  It appears to be some kind spatula?  It's made of #5 plastic and measures 11"x 1". What the heck IS it and what is it used for?
By: bajablue

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Thu, 30 Aug 2012 09:44:02 PDT
Voltage quality recorder? Tejas Narayan Hello, i am an electronics hobbyist, and want to develop an system which is an voltage quality recorder, i mean it measures the various voltage disturbances like transients, swells, sags, THD, etc, I was comfortable in analyzing the concept and with the software too. but for the hardware implementa...
By: Tejas Narayan

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Mon, 13 Aug 2012 09:44:03 PDT
Anyone able to help suggest parts for a digital dogtag? Pat The Fox Hey all, I'm a first timer on the site and had a question that I was wondering if people could help me solve.I am trying to make a digital dogtag to display some text (3 or four lines in blue) and be hung around my neck. I figure I was looking at a screen about business card size in width and tryi...
By: Pat The Fox

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Sun, 12 Aug 2012 17:31:33 PDT
Is this a good pcb design practically speaking? Shariq92 I designed this PCB in Diptrace and now i am going to etch it at home. This is my first PCB design. Can someone please tell me if this is a good and practical design? This is a design of a water level indicator based on a single NOT gate IC (HEF 4049). UPDATE: I redid the layout. Increased the tra...
By: Shariq92

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Fri, 10 Aug 2012 11:49:53 PDT
Wanting to put red LEDs in the hood scoop of a truck so it looks as if the engine is "alive." Livingstrong I have a friend who wants to put red LEDs in the hood scoop of his truck. The truck is a Toyota Tacoma with a stock hood scoop. We want to have the system run so that the more RPM the engine experiences, the brighter the lights shine. There would be a baseline brightness (idling RPM) and a maximum b...
By: Livingstrong

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Tue, 7 Aug 2012 18:15:14 PDT
DIY Infrared range disappointing, TV left wanting more... earthtown I have constructed what I like to call a circuit...and maybe therein lies the problem. The folks over at have been gracious enough to post the schematic to the hardware that they also sell in the store. I have followed this as close as I could, however I have gone astray in 3 areas. PRO...
By: earthtown

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Mon, 30 Jul 2012 11:51:57 PDT
How do I set up a mobile wifi router (LAN), and a wifi windows machine? torclausen We are a collective of dancers and bicyclists that organize huge bicycle rallies up and down the west coast. There are dozens of bicycle sound systems on these rides, and we seek to send an airplay audio signal to everyone's smartphone with wifi. The software of choice is Airfoil. http://rogueamoeb...
By: torclausen

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Sun, 1 Jul 2012 20:15:30 PDT
strange 3 input DC motor help on its operation luig i have a servo from a mattrax hummer rc from radio shack (its PCB has broken)  so i opened the steering servo its has a small DC brushed motor, but what puzzles me is that it has 3 leads that control it, my question is how does that third lead work, it i attached to two capacitors and each lead to o...
By: luig

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Sat, 23 Jun 2012 13:02:11 PDT
How to build a space capsule for instructing children ilavenil Hi, I teach space science and I want to show students a model space capsule that looks similar to the apollo capsule (image attached.)I want a shell made of some material, in which they can place styrofoam blocks that represent the various components (drawing attached). I'm planning three tiers ins...
By: ilavenil

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Sun, 10 Jun 2012 21:39:31 PDT
Battery run bluetooth class d amp - help me fix the noise problem. torclausen Hello, I am designing a small bluetooth battery powered portable speaker enclosure/boombox. At the core of this design is a cctv li-ion battery that has 12v and 5v USB output ports. Its a great start to a boombox, or at least I thought it was. From that battery, I am powering two things. A parts ...
By: torclausen

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Sat, 24 Mar 2012 17:57:49 PDT
I need help identifying a hall effect sensor AnotherBrian I'm working with a brushless motor with a 3 hall effect sensor feedback ring and I messed up one of the sensors while removing some potting. I need a replacement. I've tried contacting the manufacture of the motor but they won't respond. The sensor looks like a flattened version of a TO-92 with cha...
By: AnotherBrian

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Sun, 25 Mar 2012 05:46:55 PDT
Can anybody identify these microcontroller for me? thomasporter I am an electronics hobbyist, and i really enjoy the arduino. AND THEN, I saw these microcontrollers on TV in a cat-turned-twitter-user project. could anyone tell me what they are? I recognice one of them as having an arduino underneath and I think its an ethernet shield on top. But what's the small...
By: thomasporter

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Sun, 11 Mar 2012 13:26:38 PDT
Troubleshooting help for connecting stereo components? canucksgirl Edited:  I'm having trouble getting all my stereo/TV components hooked up in the correct sequence so that each component functions as needed. All my components are Sony the cable box is Motorola (DCT700). TV (Sony KV-27FS13) with 4 input lines (Video 1, 3 & 4 from the back. Video 2 through the fro...
By: canucksgirl

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Wed, 22 Feb 2012 16:39:41 PST
Anyone help me wire some lighting/ sound effects for my son's Megaman costume? sockstudios I'm building a Megaman costume and I need to make a section of the blaster blink and make a charging noise, and then glow solid, and make a blasting noise. I have NO experience with wiring and electronics. I read a few good basic LED tutorials and successfully lit and LED w/o burning my house down, ...
By: sockstudios

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Wed, 15 Feb 2012 13:25:15 PST
My hard drive wont boot when I checked on my computer with an usb adapter and Disk Management it's reading RAW not NTFS. PitStoP My hard drive on my Pc laptop crashed when I tryed to boot it back up it would say that there was something wrong with Windows. I tryed everything and was not able to do nothing to fix it. I got an usb adapter for the hd, pluged it in my other computer opened computer management/storage/disk managem...
By: PitStoP

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Sat, 11 Feb 2012 06:00:58 PST
Anyone know of a program for designing simple mechanical systems (gears, levers, etc)? damianzuch I'm trying to design a complicated wind-powered whirligig that has a lot of gears and levers in it; I would love to design it on a program that would allow me to test out variations before I get to actually building it. Has anyone seen a program that can do that? Much appreciated, Damian
By: damianzuch

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Wed, 8 Feb 2012 17:14:47 PST
What is wrong with my VDG? MadScientist101 i have just finished my small van de graaf generator but have run into a problem. I am only really building this small one as a model for my future large VDG so it is not to important, I would just like to find out more. My setup consists of two wooden dowl rollers built up with tape to "bevel" them...
By: MadScientist101

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Thu, 2 Feb 2012 13:06:50 PST
Does anyone know a simple but effective battle bot for a beginner? userto Hi, I'm a starter to the "battle bot" world. I've added stuff to rc cars but really I'm kind of a noob at it. So I'm just looking for a simple to make, possibly cheap and effective battle bot to make.
By: userto

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Tue, 31 Jan 2012 16:29:21 PST
How to recover Corrupted Excel file Can any one help me ...........? mdishaq
By: mdishaq

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Wed, 25 Jan 2012 05:41:26 PST
How to make / source storage clipboard for Ipad. Help? babydocmac How do I (as an ER doc) make a storage clipboard that will hold my ipad and a few other tools. I need it about 5cm deep. Nothing available to buy that Ive found.  Help?  was tried but I want a tray (with foam to hold in position) and tr...
By: babydocmac

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Sun, 22 Jan 2012 05:58:38 PST
Any ideas about how I might be able to take a fan remote and use a sonic screwdriver in place of it? noatablast Ok, so I accidentally broke my fan remote trying to put in the battery, luckily, it was only the contact to the battery that was busted and the rest of the chip is completely intact. Anyways, I was wondering if I could somehow take the parts from the broken fan remote and sort of put them into the t...
By: noatablast

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Thu, 5 Jan 2012 05:28:31 PST
help upgrading an old RC truck? zack247 Ive got an old New Bright RC truck, i got it around 2000 so as you can assume the batteries arent very good anymore. im not looking to repair the batteries though, im looking to upgrade the truck with a little bit of some newer technologies. heres where i ask for help: i dont want to overpower the ...
By: zack247

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Fri, 9 Dec 2011 21:20:35 PST
Do these connectors have a name? mdog93 Does anyone know the name of these electrical connection things. Used instead of soldering something together if it needs to be taken apart. They are screwed onto a bolt with a nut. the bolt passing the current to the connector which is attached to a wire.
By: mdog93

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Mon, 28 Nov 2011 15:04:16 PST
Interfacing with an LCD display from a Canon multifunction printer? Infinitevortex I recently salveged an LCD display module from a smashed Canon all-in-one printer.  So far, I have been unable to search up any information on it.  The manufacturer seems to be "APEX" (see fifth picture), and the circuit board has a backwards "RU" mark.  Any ideas as to how to talk to it, possibly w...
By: Infinitevortex

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Thu, 10 Nov 2011 03:22:32 PST
Automatic Insect Painting/Gluing Device for Scientists? blorgggg Scientists studying small insects need ways to assign a unique ID to each bug. Two of the most common methods they use are A) manually painting small color patterns onto the thorax (and sometimes head and abdomen) of the insect, and B) gluing a small tag(number, qr code, RFID chip) to the thorax. Th...
By: blorgggg

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Wed, 9 Nov 2011 17:14:44 PST
Diode recovery time question? DELETED_Electorials Hello, I have a little question about regular diodes. I know that when we connect a high frequency signal to a diode (in series with a resistor), that diode won't fully cut off the current as soon as the voltage becomes negative. (see picture) But what happens if we're not working on high freque...
By: DELETED_Electorials

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Thu, 3 Nov 2011 13:16:20 PDT
Removing chlorides from a solution to leave only metallic copper? The Ideanator I'm trying to deposit metallic copper into a piece of wood and i'm doing it with a solution of copper chloride (the alternative pcb etchant to the ferric stuff). I want to deposit metallic copper into the wood where it has soaked in and remove the chlorides altogether. Bearing in mind that i don't w...
By: The Ideanator

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Fri, 7 Oct 2011 08:33:30 PDT
Laptop problem: "Appropriate permissions"? (Edit: Gave up on DIY approach) Kiteman #1 son has done "something" to his laptop (Sony Vaio VGN-FE31Z).  No matter what software he tries to start directly, he gets the message: "Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item." However, if he goes to "My Docu...
By: Kiteman

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Mon, 26 Sep 2011 02:14:17 PDT
What is this? 101yummYYummy101 I recently got this "motor" in a box full of old telephone supplies. It didnt come with any instructions or anything on how to use it, which some of the stuff had. It looks like a giant motor. Any ideas? It says Teletype Corp on it, but I couldnt find any details on it anywhere on the internet.
By: 101yummYYummy101

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Fri, 16 Sep 2011 14:20:12 PDT
Time Travel? joespicnictables Is time travel theoretically possible? (I just watched Minute Men) :P
By: joespicnictables

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Thu, 15 Sep 2011 06:29:10 PDT
Why do primary coils differ in shape and location between different Tesla Coils? StumpChunkman I've been researching Tesla Coils, and one thing in particular strikes me, no one seems to agree on a shape and placement for the primary coil. I've seen reverse cone, cylinder, perpendicular spiral, and just wrapped haphazard. You can see which coil is primary in the following images, as well as e...
By: StumpChunkman

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Sat, 10 Sep 2011 13:16:28 PDT
What are the upcoming instructibles contests? nepheron It used to be that under the 'contests' tab it would show you not only the current contests, but contests coming soon. Where can I see the upcoming contests? Thanks! -nepheron @
By: nepheron

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Fri, 9 Sep 2011 08:15:32 PDT
what kind of buttons can i put on a glove? thealeks i have a project im working on, and i need to put(or make) some kind of buttons on the finger tips of a glove. nothing complicated, just basic switches that will complete a circuit when i touch stuff. any ideas?
By: thealeks

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Thu, 25 Aug 2011 14:37:37 PDT
My son droped his dslite and it turns on but the top and bottom screens r off? what do i do?? deer boy
By: deer boy

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Wed, 24 Aug 2011 07:19:18 PDT
Best wat to dig out a fossil? AUG-5OM3 Just a quick quiestion. During my Holiday I found a couple of ammonites. but the all have the same problems. they're made of slate (really weak stone made up in thin layers like triplex.) and have alot of stone around them. Is there a way to cut off the remaining rock without damaging/breaking the ...
By: AUG-5OM3

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Wed, 17 Aug 2011 09:24:31 PDT