Completing a circuit when a circuit is broken

I'm wondering how a circuit is made similar to an alarm. For example, when a point in a circuit is broken, it activates something else (led, etc.$

Posted by cyberguy91 6 years ago

DC to AC Converter Circuit

Hi, so I have a sound amplifier that is designed to run off of 18-28V AC power, but I want to try and run it off a 24V Battery, can anyone give me a circuit that would achieve this?

Posted by Fozzibehr 4 years ago

Cannot enter my instructable in Circuits contest 2016

I'm trying to Enter my instructable to circuits contest 2016 but when i click "add".. it says "pending approval"   but i didn't received a confirmation message for the same.... i also added my instructable to the LED contest and i immediately got a confirmation email that my instructable is pending approval but i can't enter the circuits contest.

Posted by Suraj Bhawal 1 year ago

Need a Circuit Schematic to detect Static Charge with an Ammeter

I been trying to find a Circuit Sim app to play around with and create a real circuit that can detect Static charge, which in theory Paranormal Investigators say ghosts can give off a static DC charge to the meter. The only thing I can do this little Circuit like this - just with a LED to dim indicating a Charge, but I wanna go for a more complex version of this by adding in an ammeter to Detect the Charge as (Milliamps) MA about 0-20 for sure, but I don't know how to make do to that. So I been wanting to build something both cool and try to detect Ghosts with this thing, and just have fun with Circuitry.

Posted by SuperScourge 3 years ago

Large NC (Normally Closed) Switch

I am currently working on a project which requires a larger NC switch. The concept is that when someone sits on the switch, the current will be blocked and not flow. When the person stands up, the current will flow through the circuit. This specific switch has to be flat enough for someone to sit on. Does anybody have any ideas on how to build one?

Posted by SamuelD79 1 year ago

where did you learn about electronics?

Basically where and how did you learn about electronics (wiring, circuits, diodes, soldering, etc)? you guys make great stuff and i want to do that too. so any books, websites, etc will help. just let me know how you did it. thanks. and please dont say much aobut college. i can do that option. thanks

Posted by leader1 9 years ago

Basic Electronic Safety

Hello all! I'm beginning down the route of hobbyist electronics. As to basic safety precautions I'm really quite unsure. I know inside many electronics parts and devices (For example, a TV one would strip for parts,) there are many nasty chemicals. I don't want to get lead poisoning or any other sickness. If you could point out some safety precautions, I would be incredibly grateful (Ex. Always wear gloves, wear a mask when soldering, when stripping a TV...., etc.). Thanks for your time and help!

Posted by I Am That Guy 6 years ago

Model Plane Location dropper

Hi guys I am looking for some help, I am hoping to create a model plane/helicopter which will rotate on an arm (or fly for real). As it rotates (or flies) it will pass a fixed point on the ground and release its cargo onto the ground below. The fixed point must communicate in some way with the plane/helicopter to show that the location can be moved and the planes cargo will drop to the new location. It is a tricky task.  I am also restricted in size - my entire project cannot be larger than 500mm  All helpful ideas would be HUGELY appreciated.

Posted by j-nolan 3 years ago

Circuitry and Metalworking // Classes and Workspace at 3rd Ward Brooklyn

Our beloved Instructables members, allow us to introduce you to a New York City area resource for makers, creators and dreamers. If you haven’t heard of 3rd Ward yet, they are a member-based art and design center in Brooklyn on the forefront of creative workspace and education. Check out the recent profile in New York Times: Just like the community that you all find on, 3rd Ward is a place for you to realize those DIY dreams within a supportive network. The main engine of 3rd Ward is the Memberships, which are open to all and offer discounted or free enrollment in their multidisciplinary class series. Classes are taught by industry professionals, ready to school you just in time for that new project. You can choose to craft an electronic sculpture from start to finish in Handmade Circuits, bring rock and roll back to life in Electric Guitar Rescue, bring out your inner bad ass in Night Welding or 150 other paths to creative bliss. Check out the full class catalog at http:// 3rd Ward is already a hub for New York area artists and craftspeople. Now, they’re inviting you to join the movement. As an offer to Instructables members: when you sign up for a 12-month Membership with 3rd Ward before November 20th- your first month is FREE. To claim your free month and schedule your tour of 3rd Ward, visit http:// and enter promo code INSTRUCTABLES. 

Posted by Culturespy 7 years ago

Help with my project.

Little help with my project.  I think ya'll could help me with my project. I have no experience in electrical engineering other than 1 high school electronics project. That I messed up, but still have that project & it works due to teacher tinkering with it. So now I'm attempting to tinker with electronics. I've taken a Paper Jamz amplifier that was powered by 4 aaa batteries and modified it to be powered by a 6v 300ma ac/dc wall wort w/o destroying either. Whoa who!! Now time to try something a bit harder. This project is to make a attractive desktop Solar USB charger, dual stereo amplifier, mp3 player system (Pandora's Box). Seeing Joshua Zimmerman of's heavy duty solar charger in a tin & USB charging circuit I believe that my project is possible. I will probably be purchasing both of them and hack together a Dual USB solar charger with 2 AA batteries.  Looking over this post could someone draw a schematic in "English" with missing parts added? So I've started to tinker. Here is a list of all the things I have. Got pictures of some of them but not sure if I have to go pro to post. (* Not married to some of these parts) 2 Paper Jamz amplifiers 8ohm 1w stereo speakers (each powered by 4 aaa batteries) 1 5v 200mA solar panel * 1 Paper Jamz battery pack * (4 aaa batteries) Not sure what batteries to use. Can power both amps w/ 1 pack. Coby 1gb USB mp3 player (playback functions powered by 1 aaa battery) 1 Micro USB MALE - USB A MALE cable cut and stripped. Breadboard, hookups for wiring. To avoid soldering. Audio hookups: 4 3.5mm M - M, 2 3.5mm F - F coupler, Stereo Y adapter 3.5mm M - 2 F  Y adapter Cigar Box enclosure. Internal dimensions (open no lid space): 2.25"h x 7.5625"w x 6.1875"d. external closed: 2.6875"h x 8.375"w x 7.0625"d So I've powered both of the amplifiers with one set of AAA batteries. I'm thinking that they can be powered by the 2 AA batteries from the solar charger. Let me know if I'm right here.   I would like to attach my USB micro male whip to a circuit, through box to charge my BlackBerry PlayBook. I think it needs 5v 1.8a for charging. Don't know if it also needs fake data voltage for charging. I've tested my phone with the USB micro whip, AAA power pack & it charges. For ease of construction I'll be using the breadboard & hot glue circuit parts together. Seeing that the mp3 player only needs power from the equivalent of a aaa battery, what is the best way to reduce the amperage from the two AA batteries so not to burn out the Mp3 player? Going to mount it against side of box with USB MALE adapter going through back wall. Use dowl rod pieces for buttons on side, battery hookups faceted inside. All components sending/receiving audio via 3.5mm audio patch cables.  Paper Jamz amps wired in parallel through breadboard to power pack. [power pack, breadboard (not mounted)], audio ports, speakers. Speakers mounted to sound board suspended from lid. Would like to mount solar panel on outside of box lid. Nothing mounted is set in stone but the audio ports & speakers are fixed in place.  Thanks in advance hope ya'll can help here. & if your going to Maker Fair Detroit this weekend have fun. Thanks again,  Okaybye! Josh Kalbow Remember to Zombie proof your projects. 

Posted by Zombie_Tinker 5 years ago

LED relay switch... maybe?

First off thanks for looking and helping if you decide to. I have only been working with computer electronic in a DIY since for about a year. My question is, do I need a relay for what I am trying accomplish and if so what kind? What I am trying to accomplish is: I have two push buttons (momentary contract switches). And I want it so that when I press the first button (orange) the first LED turns on. And when I hit the second button (blue) the first LED turns off and the second one turns on. Kind of like a toggle but only with the LEDs. The buttons are also connected to a board that is connected to my computer via USB. Which is where the power is coming from for the LEDs. I can use another source if necessary. I drew a little picture to help describe what I am trying to describe.

Posted by Foreverhex 9 years ago

Dollhouse wiring

Hi All. I'm a believer in the idea that anyone can do anything with a little info. But I'm in need of a little help.  I'm building a dollhouse for my niece and would like to add a little higher-tech slant (she won't be playing with this for a few years yet...)  I would like to add LED lights (which I will make but just have to wire for at the moment), a flicker fireplace and a door bell all on wall mounted pushbutton switches.  Feel free to suggest anything else that might be cool for a kid... The whole system will run on a 12V adapter but since I need to wire this NOW so I can continue to build, I need a drawing or schematic of how to do it. I've attached a pic of the house and have been pulling apart some of the small flicker Tealights to kitbash into the fireplace.  I have a number of white LEDs with which to make the lights but they don't have to go in right now.  I know I'll need some resistors - where do I place them?  Hide them in the walls?  On each switch? Anyways - any help is so appreciated.  She'd never get anything like this unless I made it for her - I just want it to be so cool that her brothers are impressed! Tbird

Posted by Golftester 7 years ago

Snap Circuits IC's, can I get the same functions in a small IC?

Hi. My kid (and I) have recently started messing around with Snap Circuits. We have a specific project in mind and want to design the circuit using Snap Circuits, then shrink it to fit in an Altoids box. Question: Is there a direct facsimile available of the integrated chips in the Snap Circuits box? Meaning, the same input voltage and current, where I can assemble all the matching components to my Snap Circuits circuit (switches, resistors, capacitors), and then just switch in the new (small) IC for where the Snap Circuits IC goes. This would also help with troubleshooting. Any thoughts? Here is the Elenco supplied schematic description of the Snap Circuits' IC:  

Posted by BBBMMM111 3 years ago

Circuits and Circuitboards

I would like to make circuits using paper and a conductive ink pen, but there's not way to "attach" the components to the paper. I'm looking for a conductive glue, like epoxy or super-glue, I can apply directly to the point of contact between the paper and the component. Can anyone suggest a product, or how to make such an item? Thanks, Kevin

Posted by kevin.t.stein.3 1 year ago

Wire Glue, Solder Free Fun.

Well, I'm not very good at soldering, for one simple reason, I've not done alot of it since my school days.This kind of solution is perfect for someone like me, who often only needs a simple led circuit to hook up inside a prop.It would save me having to get the soldering iron out, and could easily be an advantage when getting circuits into strange shapes.Carbon is one of our favorite elements. It makes diamonds, it makes all known life possible, and it makes pencils (and who doesn't love pencils?) Also, it seems that carbon fullerenes (buckeyballs, nanotubes, etc) are going to do a lot in our future. Time to bring a little of that microcarbon goodness into your home and make it work for you now. "Wire Glue" Conductive Glue uses microcarbon technology to make a glue that also conducts electricity.Via Thinkgeek

Posted by gmjhowe 9 years ago

humanoid or bionic robot

Hello all im new to tech i was wondering what is needed to start building a humanoid or bionic biped robot. im looking to build it for speed precision and fast calculation. eventually ill post up some rough drafts of it. thank you for your responses.

Posted by Newbie216 1 year ago

NE Oklahoma Electronics hobbyists: Do you know about Affiliated Electronics?

I just wanted to sing the praises of Affiliated Electronics, a supplier in Tulsa that sells all kinds of electronic components, from basic resistors and capacitors to breadboards, tools, wires and everything else.  In the back of the store they have a wild assortment of salvaged computer and electronic equipment.  It's a heck of a cool place to browse, and everyone is very friendly and knowledgeable. If you're within a reasonable drive from Tulsa, it's worth your time to check it out.  They don't have a website to speak of, but they are listed on Google Maps.  Needless to say I disagree with the review that's posted there. :-) This is their new location.  They moved a year or two ago from a shopping center that was razed.  The new shop is smaller and better organized.

Posted by yoyology 8 years ago

Instructables Build Night: How to Make Soft Circuits

Instructables held a "themed" build night on Thursday, August 14--the first installment in the new Build Night Series.Rachel taught a brief lesson about soft circuits and conductive threads/fabrics, and participants got to do some pillow anatomy and see the insides of LED vibrating pillows, fabric sensors, and other electronic-fabric creations. Then, everyone tried to build their own soft circuits in whatever style they wanted.Check out the promo video below and, if you're interested and in the SF Bay Area, come to Make your own Mouse Mouse with Christy on September 11 or another upcoming event.The office--aka build night workshop extraordinaire--is located at: 489 Clementina Street, 3rd FloorSan Francisco, CA 94103 We hope to see you there!

Posted by joshf 9 years ago

Best way to switch multiple circuits?

Hi, all - first time posting. I have limited knowledge with electronics and have come across a scenario where I basically need a kill-switch for a cable with 9 ends. I can't find any sort of toggle switch (SPST, DPDT, etc..) that would accommodate that many wires. I started reading up on digital bus switch IC's. It seems a 10-digit one like this would work, leaving one unused.,118/568-8418-1-ND/2765135 My question: is this the easiest solution? I simply don't know what all options exist, so any advice from someone more experienced would be greatly appreciated. Thank you for your time. -Caleb

Posted by calebpaul 3 years ago

Fiber Optic Illuminated Heels

I found these gorgeous Fiber Optic Illuminated Heels on Fashioning Technology.  These heels from Anastasia Radevich's Kinect 2011 collection.  They are illuminated using fiber optic technology and turn on with switches placed at the ankels.

Posted by Carleyy 7 years ago

Help me create a salvage/component list

Don't get me wrong I love going to RadioShack to purchase things I need for my projects, but I usually prefer to scrap older or broken electronics for my components. If you've ever scrapped to find a specific component, most likely it takes you a few very frustrating times if that. That's why I am going to create a list to post online or create a webpage for it, you can steal my idea if you wanna create it. It's going to be a list that will be alphanumerically listing: component type/ component part number/ a short explanation/s of what its used in/for, and then electronics that you can find them in. Ex: IC 16-pins         Uln2009           *motor driver         Found in: *manufacturer name* scanner model: #### So if you know any electronics that contain components commonly looked for please post the details here so I can frequently update it for everyone. 

Posted by Ryan53090 3 years ago

WANTED:Timer circuit or nimh charging circuit

Enter message body

Posted by Derin 10 years ago

Tiny timer with display

Hi I want to make a timer - a very small one - for using in school, for cookling and so on... It needs to have a display with at least four digits, five buttons(reset, on/off, start/stop, minutes and hours). I'm planning on powering it by a CR2032, or another button-sized battery. Does anyone have schematics or circuits I could have a look at? In advance, thank you:)

Posted by simo9836 7 years ago

LED circuit on flashlights

I have over 2 months trying to understand the circuit that LED flashlights have  that last a lot, yhe Joule Thief is not the circuit, because the flashlight circuit is just a capacitor, a resistor and a transistor.

Posted by GeorgeElectronics 3 years ago

circuit board

 Hi guys, I am looking for a high quality circuit board manufacturing  that can deliver high quality  circuit board ASAP and with fairly reasonable cost .  any suggestion?

Posted by Michael2000 3 years ago

Switching Circuit

Hi, I want to build a Auto-Switching circuit. I would appreciate if you could help me on circuit. Sorry for my ignorance in circuit design. There are two power sources A and B. The A is 12v and B is 3v.I would be utilizing the power from A only when B is turned On. So an auto switching circuit is required in this scenario. The circuit should sense if B is On, if so it should let A On.

Posted by arunsun 9 years ago

50% duty cycle circuit

Hello i want to make 50% duty cycle circuit frequency is no problem : any frequency thanks

Posted by aymanok 3 years ago

Free!! (Dark / Light Sensor LED Circuit)

Giving away free circuit - world's best dark / light detecting sensor circuit for LEDs... see my projects!!

Posted by pandyaketan 5 years ago

How to make 18650 circuit protection?

Help me to build circuit protection for single cell without IC. I need schematic too. Thank you.

Posted by myhobbies 4 years ago

Touch switch circuit not working?

Hey, i'm making a touch switch for a USB powered desk lamp, and the touch switch isn't working. The circuit diagram, layout and pictures are below. I used the circuits from the following two websites to design the circuit: the 4th circuit.     I've joined the output of the touch switch to a transistor that should activate the toggle. But the output of the touch switch appears to be constantly on. Can anyone see a problem with my circuit design or circuit?

Posted by Detective Inspector Me 5 years ago

Printed circuit bards

I was wondering if I can print my circuit design onto acetate and use it to expose my circuit board. Would that work? If not what could I do instead of of ording them for rediculous prices online?

Posted by pattyshaw 6 years ago

Soft Circuit Contest Is Open!!

Hey gang. The soft circuits contest is now open. There are awesome prizes so check it out!

Posted by Culturespy 7 years ago

Soft Circuit Contest - Deadline Approaching!!!

Get your entry for the Soft Circuit Contest in before the deadline: October 11th!!!!!!! Check our soft circuit channel and guide for ideas and inspiration. Prizes include Lilypad Arduinos and others brought to you by Fashioning Technology - a fun blog with excellent soft circuit tutorials and resources.

Posted by Carleyy 7 years ago

Soft Circuit Contest Deadline Extended!

We are extending the deadline for entries for the Soft Circuit Contest until October 11th!!!!!!! Check our soft circuit channel and guide for ideas and inspiration. We have some great prizes brought to you by Fashioning Technology - a fun blog with excellent soft circuit tutorials and resources.

Posted by Carleyy 7 years ago

Soft Circuit Contest - Next Week!

We are launching a Soft Circuit contest starting next week! Instructables has a great soft circuit channel  that will provide you will tons of inspiration.  Check out these other websites for tips, tools and ideas. Fashioning Technology Soft Circuit Saturday I Heart Switch Lilypond

Posted by Carleyy 7 years ago

Soft Circuit Contest Deadline Extended!

We are extending the deadline for entries for the Soft Circuit Contest until October 11th!!!!!!! Check our soft circuit channel and guide for ideas and inspiration. We have some great prizes brought to you by Fashioning Technology - a fun blog with excellent soft circuit tutorials and resources.

Posted by Carleyy 7 years ago

Came across this circuit on some gallery and got curious. what does this circuit do?

I found this circuit while on some image gallery but I want to know what it does! I did some research and does this circuit have anything to do with truth tables?  So could you please tell me, what the purpose of this circuit? and whether truth tables are involved? Thanks Dan1001

Posted by dan1001 5 years ago

ransformerless Power Supply circuits

Pls Suggest some IC name for transformerless Power Supply circuits of 12VDC

Posted by tsihabudheen 1 year ago

Need to build a circuit board

I need to build a small circuit board, with a timer and a led light, small as a nickel, I will provide more details. any idea?

Posted by danielm 10 years ago

LM35 circuit design

Hi, any advice on putting an LM35 into a circuit to control a small (120w max) DC immersion heater element so that it maintains water temperature around 38C ? Thanks

Posted by RionZion 1 year ago

Translating a Schematic to a Circuit Board

I need help translating this schematic to a circuit board. As in which rows to place what due to emitters and bases. I'm new at this, please help.

Posted by dwatord26 8 years ago

Snap Circuits IC's, can I get the same functions in a small IC?

Hi. My kid (and I) have recently started messing around with Snap Circuits. We have a specific project in mind and want to design the circuit using Snap Circuits, then shrink it to fit in an Altoids box. Question: Is there a direct facsimile available of the integrated chips in the Snap Circuits box? Meaning, the same input voltage and current, where I can assemble all the matching components to my Snap Circuits circuit (switches, resistors, capacitors), and then just switch in the new (small) IC for where the Snap Circuits IC goes. This would also help with troubleshooting. Any thoughts? Here is the Elenco supplied schematic description of the Snap Circuits' IC: Thanks!

Posted by BBBMMM111 3 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

Posted by buddybro 4 years ago

Laser alarm circuit

I am searching for a circuit which can drive a siren circuit like this and can be activated by a laser pointer.I have tried a lot of these circuits but all had the same problem:The siren sounds only for a few seconds(As long as the interruption of the laser beam...) Thank you in advance!

Posted by pizza1993 7 years ago

Help needed circuit components with different voltage

Hey, I have a circuit with different voltage components. How would I make all the components run on one battery?

Posted by xpalix 2 years ago

What kind of switching circuit do I use with Arduino

I have a 3V battery pack connecting to a single circuit.  I want to replicate this circuit 10+ times using the same battery pack as a source.  I need to apply some sort of 'switch' to control the follow of current amongst the circuits, hence turn on/off various circuits as needed.  For instance, I have 10+ servo motor circuits.  I want to connect the single battery to each circuit and control which circuit gets the current from the battery.  I have an arduino but I don't know how to interface it with what I am trying to achieve.  Any suggestions?

Posted by sheonbanks 4 years ago

Laser Engraver Circuit Help

Hello. I am making my own laser engraver out of 2 DVD burners just like Groovers version. I have some questions about the circuit that im going to use: I have seen the typical LM317 circuit for laser diodes (LINK HERE) I dont completely understand the circuit Groover made. He says that he uses the LM317 circuit over, but it does not look exactly the same. Can someone explain to me a bit why his values on the resistors/capacitors etc. is so damn different? (Though he also use relays and stuff for outputs for fans ) (LINK TO GROOVERS CIRCUIT) I made my own circuit that uses the typical LM317 circuit over, but will my circuit work fine? (Instead of the battery in the circuit, I will connect the Voltage In-ping on the LM317 to my arduino, but not exactly sure where to connect it on the arduino since i need about 7.5 V in, and not sure if the arduino got a pin that can output that much?) (LINK TO MY CIRCUIT) Thank you for your reply!

Posted by aborge 3 years ago

Person to explain how my circuit works

This is my circuit, I need person to explain me how it works, simply. I'll pay

Posted by dario1 6 years ago

Circuit Timer

I would like to be able to set a time, small like .5 seconds, and be able to power a 12v circuit for that amount of time, any ideas? 

Posted by ReconIII 4 years ago

circuit: 100+ sound bites activated at random by switch

I'm looking to make a basic circuit that plays 1 of many sound bites at random each time the circuit is closed. Any schematics out there?

Posted by Nando_Kommando 9 years ago