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polarity tester

Hi, if someone can help me how to construct such a tool polarity tester http://g-ecx.images-amazon.com/images/G/01/stores/auto/detail-page/B000KPQ7DO.03.lg.jpg Thank you in advance for helping

Topic by is4neno2    |  last reply


Ethercon/ dmx tester

I have this:I have ethercon I have xlr 3 pin male and female 1= ground 2=negative 3= positiveI have dmx 5 pin male and female 1= ground 2=negative 3= positive 4= spare negative 5= spare positiveEthercon to 4 pair dmx/ xlrPinout ethernet to 4 pair dmx/xlr : start with ethernet pin 1-8 and shieldethernet p1= p2 xlr (xlr 2)ethernet p2= p3 xlr (xlr 2)ethernet p3= p2 xlr (xlr 3)ethernet p4= p3 xlr (xlr 1)ethernet p5= p2 xlr (xlr 1)ethernet p6= p3 xlr (xlr 3)ethernet p7= p2 xlr ( xlr 4)ethernet p8= p3 xlr ( xlr 4i like to make this: a tester to test both ends of ethercon, male and female xlr 3 pin, male and female dmx 5 pin.but also ethercon to xlr 3 pin 1, 2, 3 and 4 / dmx 5 pin 1,2,3 and 4xlr 3 pin male to dmx 5 pin femalexlr 3 pin female to dmx 5 pin maledmx 5 pin male to xlr 3 pin femaledmx 5 pin female to xlr 3 pin malethe tester contains 2 times 9 leds 1 side is 8 green leds the other side is 8 red leds, led number 9 on both ends is ground and is color green and red hopefully not too much info but this is what i like to make, a fast en cheap tester.

Question by HectorS76  


Laptop Charger/Adapter Tester

I was wondering if anyone had an idea of making something that could test a laptop charger? It could have all the different sized sockets for all the types of chargers there are and a display for showing the output voltage. We have hundreds of chargers laying around and didn't want to go through the process of testing them all with a multimeter. Any help will be appreciated :) Cheers LukeSC1993

Topic by LukeSC1993    |  last reply


USB Flash Drive Tester

I am looking for a tester to use to test USB Flash Drives.  I found a cool USB port tester on instructables, but I need something that would test the hardware functionality of a USB Flash Drive not the USB port.  I am not sure if I am saying this correctly, but reading about the functionality of USB Flash Drives, it appears to be a fuse on the circuit board.  I don't know if all drives have one.  Many of the videos I watched on YouTube require taking apart the drive and jumping the fuse to see if this is the problem.  I thought if there was a way to test to see if the circuit (I am not sure if I am describing this correctly.)  was completing then it would not initially require someone to take it apart.   Looking into this a little further, I see there are four leads on a USB.  It looks like from what I read that lead 1 [+5 VDC] and lead 4 [ground]. Are these the two leads which should show a completed circuit via a tester?  You probably have already figured out by now that I have no knowledge of electronics. Thanks for your help.

Topic by epodowski    |  last reply


Homemade Smore Marshmallow Testers

Ok,Here's an idea for those of you who want to get into the kitchen this weekend and play around. Some of you may have seen my Ible on making marshmallows.So here's the experiment. The favorite marshmallow treat for many people would have to be the s'mores made over a campfire. Lets see if we can recreate some of these flavors in a single marshmallow treat.Ideas:-Use the standard vanilla marshmallow recipe as a base.-Experiment with liquid smoke flavoring to add some smoky taste. Probably not too much.-Possibly add a bit of burnt sugar. Might be able to do this torching the outside of the marshmallow or by some other means.-Graham crackers. Either crushed into a powder and added to the powder coating, or left whole and just stuck to the marshmallow.-Chocolate. Could be added in multiple places. Could be added directly to the marshmallow itself. Cocoa powder could be added to the powder mix. Melted chocolate could be drizzled over the marshmallow or dipped in.Anyone else have any other idea or feel up to the challenge of testing out the recipe?

Topic by cainunable    |  last reply


Touch pad using tester logic? Answered

Hi everyone,                  I was planning to make a doorbell of which's switch is a touch pad.I tried understanding the logic behind the touch screens used in i phones and such otherd but they seem a bit complicated.Another solution I got was a circuit which has two free wires and when a person touches the two wires(creating contact),the load gets power.This is based on transistor switching.But I don't want to adopt this design since........ I don't know for some reason.Then I remembered those classy electrical testers(seen in the picture).They have a neon bulb in them which glows when they get a voltage of certain range from one end and our body is used as ground when the other end is touched.So if I use this mechanism I just have to use the setting to power the load when a metal plate connected to one end is touched by a 'user'and a voltage is given through the other end.I know these things usually have a neon bulb as they handle AC voltage.Finally here's what I actually need to know- Is it possible to build such a circuit where a 12 VDC is supplied to one end and the load is given power when the other end meets ground(here the person touching the pad).Maybe this might be a total jabberwocky but anyway contribute your valuable suggestions.If anyone has seen such circuits elsewhere, a schematic could be really helpful.Thank you in advance. 

Question by Adarsh_tronix    |  last reply


What multimeter should I get?

After making my first few electronics projects I've learned that I really should get I multimeter so I don't screw everything up. So I've been looking around a bit and there's a lot of choices out there and I don't really know what features I should be looking for except I do know I want to get one that can read loads up to 4 to 5 amps (or maybe even more). I only want to spend around $30-$60. I found this one on amazon http://www.amazon.com/exec/obidos/tg/detail/-/B000JQ4O2U/ref=ord_cart_shr?_encoding=UTF8&m;=AMH4W1K8OCGMX&v;=glance does this look like a good one?

Topic by cannedham160    |  last reply


voltmeter and ammeter

Hi guys, could someone help me with this thing,

Topic by mammotz    |  last reply


handheld LASER voltage tester for electric fence?

Is there such a device where i can detect voltage along an electric fence keeping out wild elephants WITHOUT having to get off from the truck and personally testing the fence? Is there such a device where I can simply point my handheld device using laser or anything from the safety of my truck|? Walking through the bush and jungles are also pretty handful... Im looking @ a distance of about 10m to 20m gap between my truck and the fence. Any advices please email me directly - jungletrekker69@gmail.com Or comment in this excellent forum?

Topic by jungletrekker69    |  last reply


Cable tester? xlr, jack, phono etc

It looks pretty simple: http://www.studiospares.com/test-gear/studiospares-ultimate-cable-tester/invt/458260/ i was wondering whether anyone could help me with how i would go about building one of these from scratch within a hobby box? i have components (sockets and plugs, veriboard etc) but i've never designed a circuit before so any idea would be great! im thinking two rows of LEDs that match pins 1 to 1, 2 to 2, and 3 to 3 at each end of the cable being tested (maybe 4 and 5 too) refering to tip, ring sleeve on jacks, centre pin and ground sheath on phono, and pins 1, 2, 3 on xlrs. any schematics/idea please! take a look at the link for a better idea. LEDs to indicate shorts and phase switch would be cool too.

Question by jamesjamesjames    |  last reply


How can I build a capacitor tester?

I want to test an electrolytic capacitor in an old guitar tube amp.

Question by pjmclach    |  last reply


Twelve-year old lands dream job

A schoolboy has beaten thousands of other youngsters to land every child's dream job - official taster for a sweet company.Harry Willsher's chief responsibilities will be eating Love Hearts, Refreshers and Cola Bottles in the name of research to make sure they are up to the standard expected by the average confectionery connoisseur.The 12-year-old won the coveted post by emailing a description of his favourite sweet, the Drumstick lolly, to Swizzels Matlow, a confectionery company based in Derbyshire.He's getting "sacks" of sweets posted to his house, a personalised overall, a tour of the sweet factory and £500 in shopping vouchers.(Plus the number of a decent dentist?)Daily Mail article.

Topic by Kiteman    |  last reply


How can i sign up to be a beta tester for compaq?

The question says it all.

Question by PyroMaster007    |  last reply


Arduino Debugger Preview - 10 Beta Testers Required

The Visual Micro Arduino debug tools seemlessly combine simple debug features into the free Visual Studio plugin. The tools allow us to make use of the source code breakpoint features of Visual Studio. Please read and understand all of these documents if you are working on dangerous projects such as critical devices and/or moving machines. There are 15 draft documents available on visualmicro.com, this is a link to the first document Arduino Debugger Overview In the image below we can see a number of debug breakpoints, some are conditional. In the code, the old style debug messages are commented because they are no longer needed :) The debugger includes optional trace or break, jump to source, edit and continue. All Arduino variables or expressions can be included in breakpoint reporting. String messages are not stored on the Arduinio which allows long an informative messages to be created without using Arduino RAM and without need to alter source codes. The debug upgrade is expected to be free for educational use, $50 hobby use, $200 commercial use. 10 beta testers are required whom will each be provided with a free license. Please contact instructablesbeta@visualmicro.com Due for release June 2012

Topic by visualmicro  


AC to DC adapter/charger output giving little sock Answered

My new AC to DC adapter/charger output giving little sock. And, when I use a AC tester on it, tester light up (like Ac line). This adapter use "Ferrite core transformer". Also, checked a "Iron core tranformer" Adapter, Also, some of branded mobile charger lighten up the AC tester slightly, but not giving shock... Is there any option to fix this problem...? Output is a 12.75V/1.2A. (Loads are working Perfectly) But, the body current is the problem. There are no any short-circuit. Giving some pix... (If you need full circuit diagram, Please inform, that may takes some time).

Question by arnablue    |  last reply


Instructable not showing also

I used the new editor and i say i like it allot better . i have  been out for awhile for shoulder surgery so i may have missed something  but any way it will not show up even in the search all  https://www.instructables.com/id/Solar-Cell-Voltage-Testing-Station/ is there a list of words that might cause it to get caught up in the filters for some reason ? or is it just that i did something wrong  thank you fro your response

Topic by batteriesnotincluded    |  last reply


How do you fool a vehicle in to thinking it has a trailer with electric brakes attached? Answered

I am working on a vehicle and trailer testing box. I would like to have a circuit built in to it that makes a truck think there is a trailer attached and will send out voltage on the wire for the electric brakes. This is so I can have a volt meter measuring how much voltage the truck is sending and make sure it is linear. Would hooking up two 6ohm load resistors in parallel to the blue (brake) and white (ground) wires off of a pigtail plugged in to the 7way plug on the truck make it think there is a trailer connected and therefor send voltage, or does the truck sense a trailer hook up a different way?

Question by cerberustugowar    |  last reply


How to build a network cable certifier?

I have a fairly extensive lan in my home that is constantly expanding. I want to do some custom wiring and started looking into building my own cat 6 cables. When I started shopping for the wire I noticed a lot of complaints about wiring not being capable of carrying gigabit speeds, CCA being sold as solid copper etc. Now I'm questioning the wiring I already have, wondering if it might be the culprit for random problems. I want to find a way to test my current wiring and anything I make in the future. But as anyone with experience knows a cable certifier is thousands of dollars. Then I got to thinking if i have two computers capable of gigabit speeds shouldn't I be able to run a cable between them and verify the performance of the cable? I was hoping someone here will have the experience I lack to make this a reality. Also if it was possible to make a smaller arduino based tool that would be amazing. This seems like a tool damn near everyone could use these days.

Topic by lerch419    |  last reply



WANTED-Pattern Testers for Thesis Project: Knit Lamp Post

Hi everyone, My name is Kim and I’m a senior at MIT.  This semester, I will be working toward completing my thesis project, and I could really use some help to do so.  I’m an avid knitter who has spent the last four years studying architecture, and I plan to bring my two passions together in the thesis which I am preparing.  In a nutshell, I will be designing lamp posts which will be completely self-sufficient.  They can exist off of the electrical grid of a city or town and will be constructed from knit fabric.  Thus, they can be constructed by a few members of a community, allowing them to take action to solve problems in their own neighborhoods rather than waiting for the government fix them.   My project is about community empowerment and giving the power of construction and repair to those who need it most.  If you’re at all interested in learning more about my project, you can message me or read more of my thesis proposal at the link at the end of this post (I promise, it makes more sense than what I just typed out here).  I could really use some help in completing this project, though.  I need to find a few willing people or groups of people who would like to knit a lamp post for themselves or their communities.  I need people to test my pattern to see if it actually works.  If you’re interested, please e-mail me at kimennel [at] gmail [dot] com, or message me here.  If you want to help, I’ll be sending out a package to you with materials, knitting needles, and instructions in a couple of months.  It’ll be free of charge for you, and all I ask in return is a bit of feedback about the pattern and some photos of the construction process and final product.  So, if you want a free lamp post, please please please, let me know.  Thanks guys :) Here's the link: http://www.mennels.com/kimennel/Thesis%20Proposal.pdf

Topic by kimminentdanger  


WANTED-Pattern Testers for Thesis Project: Knit Lamp Post

Hi everyone, My name is Kim and I’m a senior at MIT.  This semester, I will be working toward completing my thesis project, and I could really use some help to do so.  I’m an avid knitter who has spent the last four years studying architecture, and I plan to bring my two passions together in the thesis which I am preparing.  In a nutshell, I will be designing lamp posts which will be completely self-sufficient.  They can exist off of the electrical grid of a city or town and will be constructed from knit fabric.  Thus, they can be constructed by a few members of a community, allowing them to take action to solve problems in their own neighborhoods rather than waiting for the government fix them.   My project is about community empowerment and giving the power of construction and repair to those who need it most.  If you’re at all interested in learning more about my project, you can message me or read more of my thesis proposal at the link which follows this post (I promise, it makes more sense than what I just typed out here).  I could really use some help in completing this project, though.  I need to find a few willing people or groups of people who would like to knit a lamp post for themselves or their communities.  I need people to test my pattern to see if it actually works.  If you’re interested, please e-mail me at kimennel [at] gmail [dot] com, or message me here.  If you want to help, I’ll be sending out a package to you with materials, knitting needles, and instructions in a couple of months.  It’ll be free of charge for you, and all I ask in return is a bit of feedback about the pattern and some photos of the construction process and final product.  So, if you want a free lamp post, please please please, let me know.  Thanks guys :) The link to my proposal is here: http://www.mennels.com/kimennel/Thesis%20Proposal.pdf

Topic by kimminentdanger    |  last reply


How do I test the switch on my HP Pavilion?

I know how to use a continuity tester but what 2 contacs will lite up the tester bulb if the switch is good?

Question by charles.d    |  last reply


does any body know how to make a led battery tester? Answered

Does any body know how to make a led battery tester for a 9v battery that has 3/4 leds.

Question by techxpert    |  last reply


Help with a wireless fireworks igniter and other functions withing it Answered

Hello Everyone, My name is Glenn and I'm new here. Last year I built a 10 cue fireworks igniter. It was really simple and straight forward. This year I disassembled it and am trying to build a wireless RF igniter. Question 1: I want to make it a 48 channel igniter but all I can find is 15 channel boards, does anyone know how I can overcome this issue? Question 2: I'm using a 12V DC lead acid rechargeable battery and would like to add an internal battery charger with a red charging light and a green charge complete light. I'm definitely electronically challenged so I have no idea how to accomplish this, can someone help? And finally, Question 3: I would like to also add in internal continuity tester but once again, I have no idea how to do it without setting off the firework it's attached to. If someone could help me I'd certainly appreciate it, thanks for reading and I hope everyone has a blessed day. -Glenn?

Question by Music_Man608    |  last reply


I'm trying to make a power meter for a Cobra Head Phaser (Star Trek, TNG)

I thought of making it a battery tester, where full charge is 16 LEDs and works down from there. What electronics would I need, and how would I put it together? (note: the phaser takes 2 AAA batteries) Or is there another method to make the power bar?

Question by mhippo  


3D printed combination lock anyone?

I am in the finnishing stages for a fully 3D printed dial combination lock, similar to what would be used on a safe.Unlike what you might find in other places there is no metal parts.No crappy amount of possible combinations either, 72 per dial dial...I took me a few weeks and quite some filament to get from a draft in Sketchup to something that actually works as planned.As it was more a training excersize in Sketchup for me I had the the following goals:1. Everything is 3D printed with as little afterwork as possible.2. All required springs are 3D printed as well as all other moving or stationary parts.3. Where otherwise fasteners or screws would be required only short leftovers of filament are used to keep the parts in place.Only exception for security reason is the mounts for the front dial and holder.These should be glued or screwed in place if the actual intention is to use it as a working lock.4. The lock shall not be pickable by means of felling, hearing or just trying out random combinations.The above points I got sorted to my satisfaction.However I would like some feedback from trustworth beta testers on the general design and functionality.It is one thing to design something that just works but a bit harder to design it the best possible way.Another big drawback currently is that it seems to be impossible to export proper STL files in Sketchup once they reach a certain complexity.Automatic services or programs to fix these issues result in drastically increased file sizes.Some of the problematic part go from just under 200kb to over 10mb after "fixed".This is not acceptable for me and I have to work on fixing this issue.Most slicers correct these tiny errors automatically and produce a correct print but I prefer proper STL files of small size and complexity over inflated ones that I then need to double check for a long anyways.A few details need changing as my tests showed that you can't drive up print details to a certain level without risking to be unable to mount the parts without further sanding.I hope to have a full set of clean STL files ready for testing by the end of this month.If you are interested to try it out and maybe contribute to an improved version your time will be valued by being mentioned as a beta tester for the upcoming Instructable.Be warned though!This is not for the faint of heart and certainly not for someone who does not know how to calibrate all aspects of the 3D printer involved.The lock also uses quite a bit of filament, currently around 37m all up but I am working on reducing this by replacing solid parts with framework instead where possible.The assembly can be time consuming and frustrating if you realise only once finnished that you have certain parts in the wrong position or orientation.But as said, my goals were not really on making it as easy as possible LOLWhy desing a lock that is neither secure enough nor free of metal parts if there is other options ;)If you happen to work with an Inventor and PLA on the left side then I can provide ready to go .gx files if prefered.They would then be already confirmed to be working and usable on one of my printers.Let me know what you think ...

Topic by Downunder35m    |  last reply


Q: can i power a (9v-battery) multitester with 8 or 10v?

Hi, i´m living in a mountain-cabin with a small solar-kit (12v battery, 6 x 2v cells).i want to buy some multi-tester (which normally uses a 9v battery).i hate to buy batteries (and not just becauce i am a cheap fukc - might actually cost about a bit less than the tester itself, go figure, beauty/beast of capitalism)since i got anything from 2-4-6-8-10-12v here (for free - thank you sun): can i run the tester with 1 volt more or less? (or does all hell break loose .. which i´m actually kinda fond of)bowing

Topic by la xerra    |  last reply


Authoring question

Hello, I'm working on an Instructable (aren't we all?), and was wondering: with a standard membership, can you add multiple authors to an Instructable? This would be very helpful, especially because my brother was the taste tester for this recipe, and he helped me with it. Thanks! Jason

Topic by Xxxjdog57xxX    |  last reply


What type of heating element is this? Inductive or resistive Answered

I found this heating element at my college loose in a tech dump. I want to know what type of element it is. Resistance is 8 ohms (when I connect the tester it says 2 then goes up to 8 within about 3 seconds)

Question by deleiman    |  last reply


Arduino Serial monitor to LC

UPDATEI manage it to work, now i have a short, cross and continuity tester for cables.PM if u need the code.Best regards,Paul L.---------------------------------------------------------------------------------------------------------Hello everyone,Can some help me to change the code in order to use a push button to start the test and all the result to be moved from serial monitor to an LCD with I2C, the address of the LCD is (0x27) and it`s useing pin21_SCL, pin20_SDA 5V and GND. If its anyone with more experience then me and could do that, the help is welcome :)Download the Code <- here you will find the code named test28.ino and the LCD code that I used to test the LCD, and a text file with the pins used by the LCD.Thank you,Paul Lungoci

Question by LungociP    |  last reply


New Colaboration Partner

Hello, im looking for a colaberation partner, i have an idea for full auto, posibly semiauto gun, lots of power, true trigger, bullpup. Need help with looks and a tester, i have only 1 Rubberband. Anyone?

Topic by knex gun builder freak    |  last reply


Shock from soldering gun? Answered

I tried a bit of soldering a few hours ago and as soon as I touched the hot tip with the solder wire,I got a shock!!(huge enough to be detected by a tester).....what shall I do?and could water touching the metal tip be a cause?

Question by Adarsh_tronix    |  last reply


I have a "dead" line wire in my GFCI outlet. What now?

I used a tester to find the line wires in my GFCI outlet.  I have a live black wire but both of the white ones are dead.  Does anyone have a suggestion or do I need to call an electrician?

Question by SherryH16    |  last reply


Nerd Alert!

I am heavily involved in letterboxing. I've seen letterboxing posts here on instructables, but just in case it's not a familiar topic, it's a hobby similar to geocaching. Especially when we have events and get-togethers we will often engage in self-deprecating humor about our nerd status. For upcoming events I would like to create either of the following props, and would appreciate any ideas on how to approach them: (1) Nerd Detector--some sort of box that would have some sort of motion or proximity sensor that would trigger an alarm, siren, etc., when approached. (2) Nerd Tester--something akin to the "love tester" from old, old-school arcades. Someone would grip a handle, and some sort of meter or display would indicate the participant's (supposed) level of geekery. Thanks for any ideas!!!

Topic by Purple Chez    |  last reply


How can I replace a transformer for batteries?? There is a third wire I dont know what to do with it!!? Answered

I'm working on a proyect and need to take off this transformer and change it for batteries. The proplem is that I don't know where to conect the wires of the batteries, I have solder and tester everything... thanks for your help btw, New instructable if you help me with this issue!!

Question by juanvi    |  last reply


NPN trasistor tutorial help

I was going to try to make a transistor tester for npn's and I wanted to know a little more about them. Please give me information about this. Whoever helps me on this I give a big thanks to. Also list some projects you made with it. I'm always looking for good ideas. If you have any comment on my question or leave a comment on one of my instructables. Thanks!!!! project_builder

Question by project_builder    |  last reply


Request: How can I test jewelry components for lead content?

How can I test plated or unplated metal components for lead content? The components I have are all kinds of metal washers, nuts, gears, wires, etc. I know there are at-home lead testers available, but they are not really made for testing metal components. I have over 50 different samples to test, so the $4 swabs are too expensive.    

Question by robinesque    |  last reply


Brushless motor not running,help needed..!!!

I have Turnigy 2836, 2350Kv outrunner connected to Hobbyking 40A SBEC ,Rhino 1550mAh 3S 20c Lipoly Battery and a Hobbyking servo tester to control the motor .when i try to start it makes two beep sound, vibrates and turns off.it was perfectly running last time i checked .which components' fault is this??? and how to check lipoly's voltage and current?can i use normal multimeter? thanks for the suggestion....

Question by ferraririder123    |  last reply


DIY Edge-Lit Display, Lynne Bruning, Digital Holga Lens

DIY Edge-Lit Display Featured Author: Lynne Bruning Digital Holga Lens Filtered Pet Water Bowl A Simple Steam Engine USB Dongle Waveguide Unique String Art Paracord Earbud Sleave Father's Day Make a Cross from a Coin Wind Turbine from Scrap Wireless Hexapod Robot USB Tester Arduino 3-Axis CNC Wiring Building a Better Stirling Engine

Topic by randofo  


how to test LOTS and LOTS of batteries?

We have 420 panasonic 2800mAH 3.7V 18650 batteries, which we plan to use in a solar car. I was wondering if anyone is aware of how to many of these at a time. Many of the commercial "capacity tester 18650" online appear to only test a cell at a time. This would take way too long. We need to ensure the cells we are connecting together are well-matched in terms of ESR, capacity, leakage, etc. So is there any solution that exists to accomplish this task?

Question by -max-    |  last reply


Converting a Laptop LCD into a Lightbox

Hi everybody. I've salvaged the LCD screen from an old laptop (an ASUS F3J). I wanna try to convert it into a lightbox (something like this http://www.x2jiggy.com/blog/2013/4/29/faulty-lcd-monitor-lightbox.html ). My biggest problem is: I only have the screen and the inverter (so if I'm lucky I only have to power the inverter to light up the backlight of the screen) but I don't know the voltage needed by the inverter or where I have to solder the power plug. I've found a tutorial http://www.technibble.com/forums/showthread.php?t=38262 but my inverter seem to miss the ground-vled-ledon-pwn copper pad for testing. Here is an image of my inverter http://img.alibaba.com/img/pb/337/805/232/1261898841289_hz_myalibaba_web7_9448.jpg . Does anybody know how I can reuse my inverter for powering on the backligh of the LCD screen? Can I bypass the inverter powering directly the screen? If possible I wanna avoid to buy or DIY a backlight tester https://www.youtube.com/watch?v=vhEGW46uCVc because I only need to light up one screen, I really don't need a full functional LCD screen tester kit. Thanks in advance ^_^ PS: sorry for the bad english

Topic by FabrizioT    |  last reply


what can I do with some old iomega zip drives?

I got 3 or 4 of these lying around, gotta be some cool servos or something in them. Might be parallel or scsi connectors on back. Even have a few disks if I needed them, though they've been run thru the magnet so data retention would be doubtable.Would there be functional replacements in them for parts in this project? https://www.instructables.com/id/Hard-Drive-Parts-Generator-and-Theory-Tester/

Question by flashj    |  last reply


flame igniter

Joho! i am making something similar to the "fireslinger" made by tetranite. The big difference is that mine w ill use short jolts of gasoline, that come from a perfume tester, so there will be short big flames, but i need something to ignite the small cloud of gasoline. the problem is, that it cant be a flame, or a torch, because it will be mounted on the wrist. so i will need a reliable ignition source, like a electric shock, the only problem with electricity i use, is that the sparks are too small to ignite everything, so i need bigger sparks, made by anything that will easily spark!

Topic by pluish    |  last reply


How do I build a simple 120v/240v ac voltage indicator?

I want to build a small voltage indicator light which will tell me whether a circuit is putting 120vac or 240vac. I will also put in a fuse tester (easy enough) but these functions will give me nearly everything I need for my job (unless someone can think of a good ammeter circuit which would indicate at 0-40A in 5A imcrements- I'm not getting my hopes up on that...)

Question by greatpanda    |  last reply


Buddies, the social network in real life!

Hi friends! :D I'm starting a new project with a couple of friends: Buddies, a new idea of social network based on geolocalization. I would be glad if you'll have a look to our web pages, I'm actually following the desing/GUI of the whole thing. There's also a fill-up form in the landing page, so you can be contacted if you're interested in becoming a beta tester! Thank you :) Buddies landing page - click here! Buddies Facebook page - click here! Buddies Twitter page - click here!

Topic by Darthorso    |  last reply


I cant find a voltmeter that detects minimal voltage to prove the success of a Baghdad battery Answered

I am using copper cylinder, iron rod, cork (to seal and stabilize), and an electrolyte - probably red wine vinegar. I am using a glazed vase to house it.  It all assembles well.  The model I am following, from a youtube video produced .4 volts.  I cannot find a tester that detects such low voltage. Can one be recommended, or, is there another way to demonstrate the voltage? any response to this question or in general would be greatly appreciated.  Helping my son with a science project.  thanks, brad

Question by bradleestoller    |  last reply


LEDs are putting static on my stereo?

I wired a outlet so I could plug in a strip of LED lights that are able to run in different modes (flash, fade, different colors, etc) When I turn the LED lights on, the stereo, that is plugged into a different circut, has static that goes with the tempo of the lights. When I turn the lights off there is no static. What gives? Here is what I got. http://www.amazon.com/dp/B0040FJ27S/ref=pe_175190_21431760_cs_sce_dp_1 I used them in another part of the basement and they work good with no problem. i also checked the outlets with the 3 light tester and it says it is wired correctly.

Question by rodsteryz    |  last reply


Tube amplifier schematic

Does anyone have a schematic for a stereo tube amplifier, I just acquired a large quantity of tubes, a tube tester and some other assorted electronics from my grandfather. Ive always wanted to make a nice tube amp, now all i need is direction. It will be another 2 weeks or so before I can actually pick them up and start testing them so I was just trying to find some schematics to get me in the right direction. I figure this may even make a nice first instructable as long as im not completely lost in the schematic. Thanks smoke

Topic by smoke    |  last reply


Which Capacitance Meter Should I Buy?

I'm interested in testing some electrolytic capacitors I have, as well as some unmarked ceramic disc capacitors.  Which one of these would work best for me? Would this hvac one work? http://www.amazon.com/Elenco-CM1555-Digital-Capacitance-Meter/dp/B0002HDTDQ/ref=sr_1_1?ie=UTF8&qid;=1365901716&sr;=8-1&keywords;=capacitance+meter http://www.amazon.com/Capacitor-Capacitance-Meter-Tester-20mf--200pf/dp/B007MHBCFG/ref=sr_1_3?ie=UTF8&qid;=1365901716&sr;=8-3&keywords;=capacitance+meter Thanks!

Question by transistorguy    |  last reply


Is there an easy way to make small solar powered lights that work indoors?

This seems like it would be easy, but all I'm finding on the web is answers that use a solar garden light to make basic "moon" jars. That's not exactly working for me: what I want is some small solar LED-looking lights, ideally a track of them, that come on at dusk in our mudroom. I've tried taking apart an outdoor solar garden light, but no luck -- wires too short, and when I tried to modify the wiring (on two testers) they both stopped working. Is there a way to buy all components needed, separately?

Question    |  last reply