inverter circuit

I have several BD139 transistors, several types of transformers, blocker diodes and 40pf 50v capacitors. can anyone show me a simple schematic to convert low voltage to high voltage?

Topic by buddybro 5 years ago  |  last reply 5 years ago


disposable camera charging circuit

Why doesn't the transistor in the inverter circuit of the disposable camera ever heat up? dont they need heat sinks? can anybody pls show me a schematic of a simple disposable camera charging circuit? pls show the transistor number and type

Topic by buddybro 5 years ago  |  last reply 5 years ago


If you have one tool to use to make a wooden sword what would it be?????????????????????/

Like a axe, knife,sandpaper, others. can be machine use.

Topic by josefu0 10 years ago  |  last reply 5 years ago


Of props and guns

Hmm... I'm sure that I posted this before. Anyways, I was planing to make a (non-working) revolver 1:1 scale. I kind of have an idea on how to make it, I just have a problem developing a plan to make a double action trigger and a rotating cylinder with the cylinder popping out of the side with a release button. A picture diagram would really help. Also: I would like to hear suggestions for material, mainly for the handle. I'm kind of new to this sort of thing.

Topic by Ausm 9 years ago  |  last reply 5 years ago


Coilgun, Marx Generator or Voltage Multiplier

I am building a coilgun and I have constructed a coil with several thousand turns, an ohm meter measures its resistance at 300 ohms, so I am having trouble powering it, I ran 240v through it and got nothing. According to my calculations, I need to run 1000 volts at the minimum through the coil in order for it to work. From my research there are three ways to do that: 1)A really big transformer (sub optimal for many reasons) 2)A Marx Generator 3)or with a Voltage Multiplier. Now I realize that you are supposed to connect the voltage multiplier to the Marx Generator, but wouldn't it be easier to just to make more multiplier stages and remove the Marx Generator entirely? I've seen voltage multipliers go up to 15kv, which is more than enough.

Topic by geekman2 5 years ago  |  last reply 5 years ago


Bugs of Instructables in IE browser10

When openning instructables in Internet Explorer 10 - I get two types of Bugs. 1.- If I open the YOU tab I get the dropdown menú but part of it is bhind the dark ribbon 2.- When I open a Project ont the topics and the headers I get some headers displayed on top of other See Pictures of my screens I have been using the same IE for about 2 years but I had not those problems before, actually they started to appear a few weeks ago. Any hint or help or Fixing the Bugs will be welcomed. Thank you all and God Bless you Carlos Arguello

Topic by Happy2Think 5 years ago  |  last reply 5 years ago


Fully-Function Retractable Grappling Hook Gun Vs Jetpack

 Hi. I'm new to this site that I discovered on my quest to create the above mentioned item. A fully-functional retractable grappling hook gun. Vs, however purchasing a jetpack. I need blue-print of how to make a strong enough retractor, I already have a grappling hooking in mind. Here goes.  Nothing like planning to dawn a cape, just like to keep up with the times. Been into mobility for awhile.Thank you.

Topic by Jedi_Pimp 5 years ago  |  last reply 5 years ago


Trying not to be history. 12VDC 500ma power supply to 12VDC 300ma computer fan

I have a project in mind which would utilize a 12VDC 300ma computer fan. I would like to use an old peripheral wall plug style power supply. I have one rated at 12V 500ma which I think would work fine.  Problem: How do I determine +/- if I cut the male plug off of the power supply without shorting out my apartment building or spending the weekend in intensive care? The cord is marked along one lead with a gray "dash". 

Topic by blackbird03 5 years ago  |  last reply 5 years ago


Skype blackmail!

Hey is there a way to find out details of someone on skype that try's to blackmail u even if it's a fake profile???

Topic by Mykl89 5 years ago  |  last reply 5 years ago


Questionnaire for Dissertation

Hello to one and all, I was hoping if all you great makers and crafters out there could help me with my university dissertation about the rise of the maker movement in the last decade. If you could find the time to answer my short questionnaire, www.surveymonkey.com/s/5P2KBB2 this would be most appreciated. Thank you Ben C

Topic by Sneblot 5 years ago  |  last reply 5 years ago


Contest Archive Page has hellip; appearing in some places

Hi Instructables! I was looking at all of the cool contests (https://www.instructables.com/contest/?show=ARCHIVE) when I found a little bug! It happens twice (as far as I know): In Sep 2012 and Jul 2011, for the link for the Halloween Draw and Paint it Contest and the Green Living and Technology Challenge, respectively. If you take a peek at the images you can see what I am talking about. It seems like "…" was meant to be an ellipse symbol but it didn't quite work out. The appearance occurred on both my Mac 10.8.3 with Chrome 29.0.1547.65 and on my Nook HD+ (BNTV600) v. 2.2.0 with Chrome 32.0.1700.99. The "…" can be reproduced by visiting the link posted above and scrolling down to Sep 2012 and Jul 2011. There you go! Blue Ice

Topic by blue-ice 5 years ago  |  last reply 5 years ago


Instructables app behavior (Bug?)

I've been using the Ibles app on an Android (V 4.3) phone for a month or two. There's a lot to like about the app experience. For instance, the app makes it super easy to follow other users who are following your account... Super easy to click "follow" on many accounts in one session. I'm not really a social networking person, by choice, so I never paid much attention to following. Never cared about the number of followers--or hits, for that matter. I'm sure this is a breach of social networking etiquette. Guilty.  So-- it's a pain to "mass follow" other users in the browser interface (yeah, wouldn't be problem if I'd kept current with following)--go to you:subscribers, click on the account, select follow, move backwards to the you:subscribers page, repeat ad nauseam, with all the load times associated. On the app--load the followers page, then click, click, click on the icon next to each account. Pie easy. But there are some odd app behaviors: One: the app Followers section doesn't sync with the normal online interface. I.E., more followers in the browser online than on the app. Two: the last "follower" in the list doesn't display correctly. Shows as "not followed," when clicking on the user's account shows that I am indeed a follower of that account. Maybe there's a sync lag that would explain this...if so, it last several days.

Topic by gmoon 5 years ago  |  last reply 5 years ago


Brains for a robot?

It's time I turn yet again to the forums for advice, this time on recommended robot brains! [Serious] I have a project for a class requiring design, construction and programming of something. More than half of my fellow students are doing clocks of some sort, be they binary or nixie tube. A friend of mine is doing a holonomic robot, and my plan was to do a walking robot, based on ideas like the WowWee robosaurus, using a simple tail and head to balance and few motors to run it in comparison to any conventional biped. As far as servos, I was hoping to use something like the HerculeX or other serially connected servo, so I can just daisy chain the few I would need and simplify the wiring, as well as get experience with serially addressing things. Planned sensors are 2-4 IR rangefinders, 2-4 wire whiskers and one tilt switch to turn it off if it tips over. Sensors I'd love to add would be something like a super basic camera for simple machine vision if I ever learn to code that well, but I doubt that will be the case; and the LIDAR thing from the Neato XV-11 which is again unlikely. Things I was looking at for super basic use included: Arduino, HC11 MC (backplane type), BASIC Stamp, PIC. For a little more complexity I was seriously considering things like the Freescale Tower ARM, Gumstix or other. I'd love to have the serial servos, sensor assemblies and the camera and have integration with Robot operating system through an onboard computer, but I have no idea what to use to setup ROS or what would be best, or if my plan of parts to use is even good enough. In other words, what ideas should I throw out as impossible or what would I need for say, ROS use? Ideally i want to do a semi autonomous robot, so that i don't have to manually direct it everywhere, but I'd still be keeping an eye on it when it's running so it doesn't break something. If I understand ROS correctly I can use an external computer to control it, but I can also let it be autonomous? Coding math and logic in the machine language for a Z80 computer doesn't really prepare for robot building, although the class is basically a teach programming basics and throw you into the deep end. [/serious] Thank you in advance for your help!

Topic by Nyanman 5 years ago  |  last reply 5 years ago


Looking for constructive critism

I have not written an 'ible in a long while, but was recently so inspired I wrote...   https://www.instructables.com/id/Make-A-2D-Infinite-Runner-with-Unity/ Luck would have it that a game contest opened during my building of the first prototype (pre write up, to get things all worked out), which spurred me on even more. Anyways, I am wondering how I missed the mark completely, not even worth a feature. I have had way lesser projects featured....and well, I was only inspired to write this to share. Anyone who has been writing here for any amount of time knows that you need to be featured to be seen. I gave detailed step by step instructions with many pictures well commented...or thought I did. I did something original (Not many game making tutorials here, only 2 other unity ones, and they are on older versions.) I thought the demo game download was a nice touch.  So I am curious for suggestions on how I could spruce it up enough to be considered as a feature. I believe that people would enjoy the topic, and more importantly, I feel people would like to make this or use this as a springboard to their own version. Was using the robot a big faux pas? I see so many other features that use him and thought it was a good idea. Is the game itself that visually unappealing? Perhaps foolishly , but I love the look....I was...even more foolishly...proud of it. It wasn't something I just knocked out, but rather something that a lot of time went into. Time that was truly wasted if it is never even seen. Discouraged. Any suggestions  to how to make it better would be welcome.

Topic by fjordcarver 5 years ago  |  last reply 5 years ago


Electric typewriter to USB keyboard

Is there an instructable that is basically universal that show how to convert and electric typewriter to a USB keyboard?

Topic by metalshiflet 5 years ago  |  last reply 5 years ago


Custom made titanium ring

Hi, Im looking for advice on making a titanium ring for my girlfriend. I choose titanium because shes allergic to stainless steel.  I was thinking of buying a small 3x3 plate or so so I have room to make a few if I screw up. depending on thickness..? Idk what thickness to choose. Then I would need to drill out the inside, and figure out how to size it to her finger by her size.  Then I would have to just shape it somehow. sandpaper? idk. I doubt that but I dont have a lathe available..  so thats why Im here looking for advice, and then after shaping I need to use different compounds to buff and polish it right? 

Topic by 'earl 5 years ago  |  last reply 5 years ago


Large Scale Water Level Indicator

Hey everyone, I hope im posting this in the right spot.  I run a large farming operation and get my water from a well that pumps into a large storage tank about 10 feet deep and 6ft diameter.   Because the well is very old I'm not able to add things like a float that will turn it on or off for me so I'm constantly having to check the well though out the day and if the cows are more thirsty one day they can drink the storage tank dry and that causes me problems with my pump, or if i leave it to long it will overflow and it makes a terrible mess. So im wondering if there is a way that I can wire up a water level indicator in the well-house and have a light board in my house that shows me the level of the well.  So for a 10 ft deep well id have an led light for every 1ft or so and when the water level gets to the top foot a buzzer would go off and when it hits the bottom foot or 2 ft then a buzzer would go off.  Ideally a wireless transmitting to the house would be best but I have no idea how that could work.  And wired would be hard with the well house being a few hundred feet away from my house.  I've done a lot of googling and haven't found anything that would suite a large scale water tank like this.  I purely want to be able to see in my house where the water level is and have it warn me when its too high or too low.  I apologize since i don't have a lot of experience in electronics.  Any help is greatly appreciated as i have no idea where to start or if its even possible.  Thanks guys!

Topic by rpfarm25 5 years ago  |  last reply 5 years ago


Something to do with an oldcd player

Hi everybody! Okay , Let's talk I have 5 old cd players here that I can break , open , use the parts and etc. and I want to know if there's a cool thing to do with these eletronics they are working , and there's no use for them, so could someone show me any cool ideia to do with them ? I tried to do a amplifier to my cellphone to listen to music here,but it didn't work as well I wanted Sorry if the topic is at the wrong place , and I have already took a look at the site, and didn't find some nice ideia :o

Topic by mcamargo 5 years ago


A gun idea i cant work out

I been trying to make make this weapon but failed every time its the CBJ-MS made by Saab Bofors Dynamics here are the stats Weight 2.8 kg (empty) Length 363 / 565 mm Barrel length 200 mm Cartridge 6.5×25 CBJ-MS and 9×19mm Luger/Parabellum Rate of fire 700 rounds/min Muzzle velocity 2,723 ft/s (830 m/s) Effective range 150 m (6.5×25 CBJ-MS) Maximum range 400 m (6.5×25 CBJ-MS) Feed system 20, 30 or 100 rounds Sights Adjustable open sights this was copied from Wikipedia

Topic by headlessknight 5 years ago  |  last reply 5 years ago


I need a polaroid or kodak fun saver disposable camera in Pakistan.

Please help me i need to make a stun gun.

Topic by Hafiz Mohammad Shayan Tariq 6 years ago  |  last reply 5 years ago


Silhouette from photo

How to make a silhouette from a photo on my iPad  I want a silhouette of our 50 Chevy Pickup to weld on to our rod iron fence thank you

Topic by HowardSue 5 years ago  |  last reply 5 years ago


Typing in the Step-by-Step Editor

There is a bug when typing in the step-by-step editor. The cursor blinks over the letter not to the side of the letter.

Topic by BenjiDaa 5 years ago


Some new stuff i got

So recently my dad wanted to throw away a old tv we had that had a bad cord (yeah we could of easily replaced the cord but be have enough tv's..) and i remember seeing plasmana's plasma speaker a while back and that it used a flyback transformer, so i ripped the tv apart taking the pcb with everything on it, speaker, and the coil thingy on the tube, since it was the first time i took one apart i had cliped the magnet wire winding so thats almost no good so i just got rid of that, and then i took apart 3 other monitors i have gotten over the years, one had a set of speakers inside it, and that was interesting to use. and a while back my friend gave me a old 5cd/radio stereo, i would of just kept it using it for the 5 disc changer mostly but the door was broken, and didnt move well at all, so i scraped it and used the speakers. Oh and theres a PSU in there i ripped apart a while ago, i have another but its stored away currently. Anywho heres just a view of what i got, any ideas on what i should make out of all this?

Topic by knexsuperbuilderfreak 5 years ago  |  last reply 5 years ago


Living salad, makerbot songs, and noodle!

My first day at Instructables, I found myself sitting on a chair fabricated by the guy next to me, listening to plans for a living salad which would grow through your plate, fertilized by worms below the surface and a stained glass window made of dried fruit, trying to focus on absorbing all the information Vanessa and Noah were dishing out. Just beyond loomed the amazing fabrication facilities, with rows of 3D printers, zillion-axis CNC machines, a stocked electronics room, every kind of adhesive you could dream of, and even a test kitchen! It was a makers dream, Pier 9 had the material and equipment resources to allow us to realize nearly any idea we could dream up, and dream we did. It was immediately clear that the one month my collaborator Kyle (https://www.instructables.com/member/kylemcdonald/) and I had planned to spend there was not enough. Sadly, it was all we had, so we got to work immediately on Noodle, a little robot with the I/O of a machine but the thoughts and feelings of a human. I could go on about the shop at Pier 9, but the thing that really made the experience for me was the people. Hosting 10-12 AIRs at a time, the studio was always full with people building crazy things. One day we'd experiment with Nick's instruments fashioned from rocks, sticks, and water jugs while sampling cocktails from Ben's machine and Rima's cricket ganache, the next day we'd admire Aaron's work on hoodies that zipped around your hands while being serenaded by Andreas' makerbot which seemed to be singing the future. We were all so excited and inspired it wasn't unusual to find half the group there all weekend long or into the wee hours of the night. I won't go so far as to say anyone slept the night there, but...  Not only did we get to hang out in the AIRea, but we also got to know all the others working at Pier 9. This was a building full of people willing to chat about anything from caustics to contests, lend you their skateboard so you could learn how, or demo their latest projects. Vanessa and Noah couldn't have been more supportive and helpful, and it was so inspiring to run into them in the shop on weekends hacking away on crazy things of their own. With so much going on, we sometimes had to work hard to tune it out and stay focused on our Noodle. Luckily, Kyle and I had worked together before and we were able to divide and conquer pretty productively. Kyle handled the fabrication aspects, spec'ing all the hardware and designing and lasercutting then 3D printing the physical enclosure for Noodle. I was heads down on the software trying to hook up our raspberry pi to Amazon Mechanical Turk, speakers, a display, a camera, and an interface. Thankfully, the long hack sessions were broken up by Vanessa coming by to peek at my computer over my shoulder and ask, "what's taking so long? how hard can it possibly be!" ;) I will end this post here and get to work finishing up our instructable before Vanessa hunts us down. If the specifics of our project are a bit cryptic still, all will be revealed with the instructable post (see attached pictures for more mystery). And to all of you considering applying to the AIR program, DO IT! If you are a motivated, curious person with energy and ideas you will have a blast. And the weather is ok, too. Thanks Vanessa, Noah and Instructables!

Topic by lmccart 5 years ago  |  last reply 5 years ago


LED Circuit Help

Https://www.instructables.com/id/Romantic-LED-Heart/ I would like some input on making this using a 555 timer and POTs to make an adjustable fade in/fade out circuit while running on a 9v battery and using a pressure switch to turn the LEDs on when the box is opened.

Topic by YoungOne453 5 years ago


transformer!!

Hey guys this is rush... i want to make a high voltage power supply made from a charger and a trans former this is how i'm planing i will connect the output of the charger to the real output (where the plug is connected ) of the transformer and connecting the real input (where it originally lowers the voltage) meaning to say  output(ch)--->input(trn) the output of the project is the real input of the transformer  guys pls. help me as fast as you can  tnx - ~_~

Topic by crazy lazy man 5 years ago  |  last reply 5 years ago


Help me!!

Https://www.instructables.com/id/plugduino-Arduino-based-120-Volt-outlet-controll/ In this Control circuit schematic They explained about sensor inputs (the sensor inputs are connected to the analog inputs on the Arduino board ( A0, A1, A2, A3 ). The input voltages on these pins are converted into a 10 bit integer value such that the range between 0V and 5V and translated into a value between 0 and 1023 respectively. The ideal connector thus contains 3 inputs per sensor ( 5V, GND, A ) resulting in 12 connection points.) I need clear explanation about this and what type of sensors they using and how they connected ?? Thanks For ur help :) :) 

Topic by svenkatesh3 5 years ago  |  last reply 5 years ago


Views counting

Hi! I am new to instructables and I have been uploading some video tutorials by embeding YouTube videos. The number of views in the instructables page is going up quickly but if I check my videos in my YouTube page I cannot see that there are that many views. Is there a reason for that? I have searched in the forum an answer for that but I cannot seem to find one. Thanks^-^

Topic by DIYlover89 5 years ago  |  last reply 5 years ago


Johnhall14's Tactical Shotgun v2 Mods and Review

Whatup! So I built Johnhall14's Tactical Shotgun v2. It was pretty ownage, but there were a few things that popped out at me as annoying, but easily fixed/modded: -Underbarrel shotgun's trigger guard kinda got in the way and was flimsy -No sights -Handle guard broke a lot; got annoying -Pin pull was obstructed by lots of yellow connectors -Trigger was a little short (imo) -Pin got stuck on pin block when being pulled back Now, these are all the negative things, but in the original gun, the positives outweigh them. Here are all the things I love about this gun: -Powerful. This gun is actually really, really, powerful. -Looks pretty nice -Mag is easy to use and looks cool -Underbarrel shotgun is awesome and really fun to shoot -Shoots 3 bullets per shot, with a mag. Now that's firepower. -Great range for a shotgun: 35-50 feet So I decided to mod the gun and fix all the things that annoyed me. Here's what my mods have done: +No more underbarrel shotgun trigger guard +Simple sights (better than nothing) +Reinforced handle guard +Pin no longer obstructed, which actually makes the gun look cooler (imo) +Thicker handle (May not be a plus for some people) and sturdier stock +Revised mech so pin doesn't get stuck +Metallic 6th and 7th layers, even on mag +Modded mag that shoots one bullet at a time +Easy to grip pin This gun, after mods, is probably one of my favorites that I've ever built. It's powerful, it's got some serious firepower, and it looks awesome, which can't hurt. Props to Johnhall14, this gun is awesome! ANYWAY, check out the video of this gun in action! DISCLAIMER: I edited the video so times in between reloads were cut out. The ROF shown is really inaccurate, and it's much slower than you're about to see. The ROF is still good, but it's not this fast. More Mods/Review -  Red's Reliable (R3)  

Topic by FlyingFish10 5 years ago  |  last reply 5 years ago


Can't edit Collection

Hi, I made a collection (https://www.instructables.com/id/useful-stuff/ ) that can not be edited or unpublished. I addition, the graphical feedback after trying to add something was quite misleading by showing a green checkmark along with the error statement (see image below) Sorry for crossposting the topic to the FAQ section (in https://www.instructables.com/community/How-to-edit-my-Collections/ ) - I now realize that it must be a bug. I also tried to reproduce the error by making a new collection with the same content. However, this new collection can edited and unpublished without any problems. Any ideas? Best wishes, Lars

Topic by ljohann 5 years ago  |  last reply 5 years ago


GSA Auctions

Hello dear friends! I lately have found a resource for us makers in the US. The General Services Administration conducts auctions of government surplus. From real estate to machinery, anything that you could find useful. Check it out! GSA Auctions

Topic by blkhawk 5 years ago  |  last reply 5 years ago


How to connect physical pushbuttons to a computer for use in a soundboard program?

I plan to do a project that will use 28 arcade style pushbuttons to activate 28 different sounds on a computer. Any ideas on products out there I can use to connect all 28 buttons to a computer, preferably with a USB cable, so it can be used in a programming language such as C++? One idea I had was to take apart a QWERTY keyboard, but I still want to be able to use my regular keyboard to use my computer. Alternatively, is there a way for two keyboards to be connected to same computer, but one of them only activates a specific program? i.e. trying to type in notepad with it wouldn't work?

Topic by Swordmasterb 5 years ago  |  last reply 5 years ago


Casio pocket Tv: Tv-1900B info/suggestions on uses?

I just received a casio pocket television model: Tv -1900b, produced somewhere in the late 80-mid 90's(cannot find year) as a gift from my sister, purchased for 2.99 from goodwill, she bought it because I like vintage electronics, and thought it was useable as she was not aware of the difference between dtv and analog, and took the label heading that it received working channels for true, from my research it appears to be functioning but is receiving no signal due to the dtv transition. this is my problem, I am trying to figure out ways around not having an available analog broadcast to pick up, and can not find much info for this tv model online, not even part labels manuals or specs, Im wondering what my options for use or connecting it to another device are.. There is what appears to be an extra headphone sized jack/connector at the top next to the speaker, and a headphone plug does fit into it... but the label for it is long gone, so I do not know if it is an external antenna connection, external composite video in port, external video out port, or a service port of some kind, as it is right next to the rod antenna  screw connection, what exactly is it, and can it be used for an external video/sound input connection?, I see that  on other models before and after this one it can be used as a video/audio input, when utilized with a rca to headphone adapter cord but that does not tell me for sure if mine has that ability. What are my options with this?, I have some technologic know-how, but could not build my own signal transmitter, oscilloscope, built in jack, etc from scratch. is this model capable of easy external connections?, is the extra hole for an antenna input, video input or both?, can a box, dvd or vcr be connected, also is wrapping wire around the antenna and then connecting to the coaxial output on an external device feasible? Iv seen it work on other pocket tv's on the internet but dont know about the true signal quality/effeniency I would be able to make most physical external connection adapters myself, or, are adapters other then the headphone to rca adapters sold to remedy the problem of having a rod antenna and little to no external hook-ups? p.s I am not opposed to having it constantly wired/tethered to a much larger device, as it would be used for a novelty or in a small area where a larger unit would be to big or unweildy, like next to a bed, spot at the table, etc, also I would probably not use it for cctv or similar as I have little to no use for such things the picture included is not of my actual item, but the same model and version, for reference purposes I appreciate any help, as it appears to be functioning it would be a shame to not find a use for .

Topic by spiky84 5 years ago  |  last reply 5 years ago


Fire Extinguisher recycling / re-purposing

Hi, I run a fire safety company in the UK. I'm looking for new ways to re-use old fire extinguishers. Maybe I could make a smoker/dehydrater from a large cylinder type? We always have old fire extinguishers to get rid of that are no longer required. The ABC Powder type are a pain to dispose of, but provide different sizes of metal cannisters and 'mono-Ammonium Phosphate' powder, which could potentially be re-used as fertilizer. Whist we do send 2kg & 5kg CO2 units away to get a rebate on new units we tend to have plenty of these available, should someone want to tinker with one. Possibly for the wind-chime / Temple Bell Instructables? or maybe to make a resin filled filter for biodiesel?. If you live in the UK and would have a use for these untis let me know, you can always collect some from Bristol or Gloucestershire.

Topic by Nemesis201077 8 years ago  |  last reply 5 years ago


c compilier

Where can i get a free c compilier because ive been using djggp and its has a limited source bytes i want unlimited source bytes

Topic by cris1133 11 years ago  |  last reply 5 years ago


Tags / Keyword Will Not Save.

Hi. Mimi again!  Thanks for helping to get my video ible to post!  One last issue I'm struggling with. I can't add or save tags / keywords!  See this screenshot: http://tardis1.tinygrab.com/grabs/d2bb728579f077e9b30fac5ef3920f1e60d85908c1.png or the file attached.  You will see that there is a field for keywords, but no update or save button.  The other options all have a little "update button" next to the entry field.  I can type in all the keywords I want, but there is no way to save them.  And when I navigate away from the page, there is no evidence that they were ever entered.  Am I missing something? appreciate the help! Mimi

Topic by HeyMimi 5 years ago  |  last reply 5 years ago


Help with sound reactive LED

Heyy there since i am new to this forum i might have made this question in the wrong section So...i have built a sound reactive LED with a TIP31 transistor that it is powered by a 5.2 volt power supply and it works like a charm! You just plug it on the wall and plug the 3.5mm jack on your output and done! But here is the problem...my laptop's sound card is to weak to power the LED properly so i attached it to my stereo system.It worked better but when i turned up the volume it kept glowing instead of flashing to the beat because the music was loud.My question is..should i use a resistor between the stereo output and the sound reactive LED so it will flash when the music is loud? If yes how many ohms? (PS I am new to these stuff but i know the basics and know how to solder two wires.) (PS No2 I have attached some pictures with the simple schematic and the whole project.) (PS No3 Sorry for my English it's not my mother language.) (PS No4 The uploader is not working for some weird reason so i am not able to upload the pictures)

Topic by KickBuster 5 years ago  |  last reply 5 years ago


Craftster Contest with Instructables Prizes!

Craftster is running a contest with prizes we provided for them! You should check it out, but here are the basic guidelines for entering: Your mission, should you choose to accept it, is New Year, New Uses!  Your challenge this month is to bring new life to an old object in your home.  The object could be a houseware piece, an item of clothing, home decor... anything you choose!  Your repurposing should transform the object into something entirely new and unexpected.  Perhaps you'll finally get to make a lamp out of that vintage, avocado green blender you've been hoarding all these years. Who is part of Craftster and is going to enter?!?

Topic by Penolopy Bulnick 5 years ago  |  last reply 5 years ago


de-airing pug mill

Has anyone tried upgrading a non-de-airing pug mill to de-airing. I'm thinking about trying this but I'd like to benefit from others experience.

Topic by docweathers 5 years ago


I feel an urge.......

I have an urge to build a replica, your job as a person who is reading this is to tell me what gun I should replicate.

Topic by TheAwesomestDude 5 years ago  |  last reply 5 years ago


DIY Bookmark with Finger/pointer

So I have found a bookmark in the internet which is pretty cool . I could buy one but I want to make one for someone which is becoming a special someone to me, and I thought of this idea would be really great if I give it to her as a gift or one of the Valentine's Gift ill give. I'm not sure if I'll be able to make a rubber-like one but i thought just making of a simple typical bookmark but with a scroll-able finger  pointer which might not damage the pages of her precious books/novels  she always read  Im still thinking on if it would be back to back so that if the pointer cant point , it can be turned and point some part of the book. The black would be the bookmark itself with the message and the image (my Profile pic) of the Pendant she gave to me Red is the pointer it self, it can be pulled back and forth to pinpoint the word/sentence, also can be pulled up and down with the Green opening as the opening, and the Yellow as the lock so the pointer can't be pulled out.  All opinions, suggestions and feedback are greatly appreciated :D

Topic by hindmarauder 5 years ago  |  last reply 5 years ago


4 X 1 Year Pro-Membership Giveaway! (DONE)

Anyone want a 1 year Pro Membership for free? I'll be giving away 4 X 1 year pro memberships to 4 different members of instructables who are not pro and have posted at least 1 instructable (ible). Post a comment on this forum and I'll PM you the gift code :)

Topic by Muhaiminah Faiz 5 years ago  |  last reply 5 years ago


Empty contest notification emails

I recently tried to follow a couple of contests, and set the settings to receive emails when new ibles are added to contest. Most of the time I get standard text in the email without the information about newly added ible. Sometimes I get it when there are many ibles. Seem like a bug to me.This is what I get , please see below: Here are the newest items from each of the contests you are following.  To change or turn off updates, go to your following  page: https://www.instructables.com/you/watchlist?modify=WATCHLIST --------------------------------------- Thanks for being part of our community! Instructables Team @ Autodesk | https://www.instructables.com/ To manage these notification messages, please visit your watchlist preferences: https://www.instructables.com/you/watchlist?modify=WATCHLIST

Topic by Tarun Upadhyaya 5 years ago


Video Not Publishing

I am attempting to publish my video, and still it is not publishing. The YouTube code is embedded properly. Apparently, this is a known problem. Is there any sort of temp fix for this?

Topic by Progressive Automations 5 years ago  |  last reply 5 years ago


What is your favorite thing about Instructables?

Just curious, what does everyone like most about this site?

Topic by techguru14 5 years ago  |  last reply 5 years ago


How to reuse old tablet battery for a usb PowerPack

Hi, i have two 3600mah batteries from an old chinesse tablet, I would like to use as an portable battery pack for charge a cellphone. i searched for similar instructable but i have no find anything, what is the next step

Topic by vtlaxcala 5 years ago  |  last reply 5 years ago


K'NEX Magazine Comparisons - 5.56 NATO, STANAG Magazine

On thing that makes any K'NEX gun replica more accurate is the magazine. Trust me, if your magazine is to big or to small, it will make the whole gun look bad. As this is the case, I decided to "clear up" the small argument about the size of 5.56 NATO magazines, as some people are incorrect on the size of K'NEX magazine that they use. As you see in the pictures below, TD's magazine (yellow connecter - white rod - yellow connecter) is more accurate than the other type (white connecter - green rod - white connecter). The latter version (white connecter - green rod - white connecter) is quite a few centimeters too long, and is more accurate for some 7.62x51 replica K'NEX guns. The last pic is of my Dad's Bushmaster Carbon 15. -The Red Book of Westmarch

Topic by The Red Book of Westmarch 5 years ago  |  last reply 5 years ago


An Alternative K'NEX Gun Site...?

After working on and publishing my new site, I thought that it would be kinda cool to make a K'NEX gun site. How many people are interested? Obviously, I would not bother to make it if nobody is interested, but if people were interested, I would be more than happy to make it. I just want to gauge interest. -The Red Book of Westmarch

Topic by The Red Book of Westmarch 5 years ago  |  last reply 5 years ago


reclying old wacom enabled laptop ?

Hey guys , firstly let me introduce myself  my name is virgil and im student on a budget :P and new to these forums  My dilema : i have ahad a hp tx2500 since 2008 , to be honest im surprised its lasted this long , anyways its a netbook/convertable that has a screen that folds down onto the keyboard , it is  touch and wacom active digitiser enabled  and recently the gpu on it has failed just like 90% of these models do , so my question is simple   can i use the wacom digitiser unit from behind the screen and put it into another laptop/convertable  screen) unfortuneatly i dont have 100's of euro to spend buying another wacom enabled laptop or tablet as now theyre around 600 euro at minimum , i can however afford to buy a cheap 12.1inch laptop (note the wacom digitiser module im trying to recycle is made for a 12.1 inch screen) i have seen the digitiser panel for myself and it very very thin ,so is there any way to integrate it into another device ? or maybe even somehow connect a usb to the panel and attach it to a laptop that way ? if so any recommendations as to how to do this or what laptop i could modify ? any help at all would be greatly appreciated  thanks 

Topic by vchircu 5 years ago  |  last reply 5 years ago


Do you need a manual for an old power tool? Try this site!

I inherited a circa 1980 Craftsman router and circa 1985 Craftsman router table from my Dad, who died last September. Since Sears seems to be on life support and I think the plug might get pulled on them, I had a look on their support pages for these manuals, while I still can. They sell parts for these models but don't have the original manuals. For a possibly similar router Sears wanted $8 for the manual. Ummm, no. This site has an awesome collection of old power tool manuals, free, and you don't have to register. http://vintagemachinery.org/home.aspx  

Topic by Mr_Liss 5 years ago  |  last reply 5 years ago