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

Topic by kevin.t.stein.3 


circuit board repair question

This little audio input jack broke off a circuit board.  I'm wondering if anyone knows what I need to do to fix it? You can see that there are 4 metal connectors which I assume a soldiering iron can easily fix.  But there is also an orange strip that snapped off of the little orange baseball home plate-shaped tab on the bottom of the jack.  Does anyone know what that is and the best way to repair it?  (The loose strand is right by where it says "CN6" on the board) I don't know anything about circuitry but was going to borrow a friend's soldiering iron. Thanks to anyone who can point me in the right direction! Phillip

Topic by pmottern   |  last reply


How to Identify homemade USB device connected to computer by passing some identification tag?

I'm planning on developing several different USB devices that will be operated by a Visual Basic 6 program I am writing.  I want to be able to identify the USB device plugged into the computer the same way a program knows when you have just plugged in a USB drive or webcam.  Is there some simple cheap way that I can wire in a circuit that will pass an identification tag so my program can identify which USB device has been connected?  There are certain criteria.  The parts must be cheaper than a usb flash stick...otherwise I'd just disassemble a flash stick and load a program to it to automatically run telling the usb ID.  I'd rather not do this simply because I'd rather not have to take apart several usb flash drives which can get expensive.  This eliminates Arduo and other costly circuit boards.  The parts when assembled need to be smaller than  a usb flash drive.  I just want to pass some ID serial number to the usb port that I can than pick up with my program so it knows that device has just been plugged in.  Any suggestions?

Question by DarkRubyMoon   |  last reply


PCB trouble?

I transferred this circuit to a circuitboard, but it didnt work. So, I tried just taking an led and soldering it to a pcb, but when I touched both leads with a battery, nothing happened. I didnt not clip the leads, I knew the cathode and anode. I was worried that when I put the led on it, I burnt it out from the soldering heat. So I desoldered it, but when I tested it OFF the pcb, it worked. The traces it was connected to was NOT connected to anything else. Any circuit I try putting on a pcb never works, none of them. Even when I just tried soldering a buzzer on it and connecting it to a battery, it only worked when it was off of it. I cant figure out why, but I am really frustrated about this. Tell me if you need to know anything else.

Question by 101yummYYummy101 


Infrared transmitter and receiver

I want to make a gadget which sends a few kb of data via infrared and also receives data via infrared with a timestamp. However, I am stuck as I have only used arduinos before and I have to design a circuitboard which I have never done before, with PIC microcontrollers (must be cheap ones). I need help a) choosing a microcontroller and b) assembling all the components into a circuitboard (ir transmitter, receiver, microusb port to transfer data to pc, battery). Gadget will eventually be portable so make everything light. Thanks Khalid

Topic by khabro   |  last reply


Circuit Boards and LEDs

Ok I need to know, does radioshack sell circuitboards? or at least those white ones as seen in https://www.instructables.com/id/Fuzzy-logic-Mood-light-with-LEDs/ If they don't then what store can I get them at? Also does anywhere else other that radioshack and the internet sell LEDs

Topic by lighteuplife   |  last reply


I need help identifying a part Answered

Somebody gave me a box full of speakers mids, highs, woofers, and tweeters... In that box also came 2 of these small circuit boards with 2 knobs attached to them... Don't know what they are, and what they use for. Any help will be appreciated

Question by Kingsup310   |  last reply


Optrex DMC40457 LCD

I recently picked up a bunch of junk from a friend including 2 Optrex DMC40457 LCD's (and a bunch of what looks like telco circuitboards) I have never worked with LCD's before and I am looking for some ideas/ beginner guides for this model. The controller chip is a HD44780 if that helps.(bad) Picture: http://joshuaburgess.biz/gallery2/v/other/lcd.JPG.htmlhttp://joshuaburgess.biz/gallery2/v/other/lcd.JPG.html

Topic by wizdum 


Small CNC Machine help?!! Answered

Looking into building a CNC maybe 15 x 20 inches working area, and need help:O Ive seen several instructables about it but still not sure which type of motors to use and why, where to buy the circuitboard OR how to program a DIY one, what are the 4th and 5th axes, and will it be expensive? Also are there any other hazards i should think about during the build? Any help would be greatly apprecited, thanks.

Question by brimckeon   |  last reply


Disposable camera innards

I was taking apart a disposable camera today and found this thing. It looks like it is probably a coil of some sort, and it has a little brother hanging out on another part of the circuitboard. The big one is about 1 cm across, and the little one is about 5mm. What, precisely is it, what does it do, how does it do it, and if I replaced it with a bigger one, what would happen? In idiot-english, please, I'm not well-versed on electrical devices. The little one, especially, reminds me of an ultra-small high-tension coil. Is that what it is? Does it perform precisely the same duty in this circuit?

Topic by Rishnai 


Cable extension parts

I am working on a project involving a Presario V5000 laptop (well mainly its innards) and would love to find extension cables for some of the components.  For example, the keyboard attaches to the motherboard via a 24 pin flat ribbon-like cable (see example image).  It would be great if I could get a simple extension piece (male to female) to give me any additional length, but I cant seem to find anyone that makes this, or what the techincal name is for that type of cable. (is it even a cable?  Is it a flexible circuitboard?) Anyone aware of a good vendor for hard to find laptop accessories like this??

Topic by phdearthworm   |  last reply


Swapping Rubber-Membrane for Microswitches?

Is it possible to convert a button from using a rubber contact to using a microswitch? The intent I have in mind is to take the buttons on a GBA and make them more like those on the SP/DSi/3DS, but the idea could be applied to any instance of squishy rubber-contacts.My best guess of how to go about this would be to trace the positive and negative leads into the switch on the circuitboard, then to somehow break that connection and reroute them into the microswitch by soldering wires to them. I need to go double-check the leads are available on the particular board I'm working with, and I wanted to test the general theory using a cheaper board like a TV remote.Any thoughts?

Question by Oi27   |  last reply


Circuit Board Help

I have a Sony hcd-fx10 dvd home theater system, and one day I turned it on and it went into protect mode. I contacted Sony and they said it needs to be serviced. I found a service manual online and took the unit apart. I consider myself handy, so this was not a problem. Upon further investigation and with use of the service manual, i found a brown burn mark on the bottom of the motherboard, which corralates to the protection detection module on the board; which is my prblem. My question is, Can I simply remove this module, or does it need to be replaced with a new one or something similar? I don't know much about circuitboards but have some skill at soldering. Attached are pictures, the best I could get of the small board, showing the actual module on the board and the burn mark on the bottom of the board. Any info would be great. Thanks.

Topic by jmmybear730   |  last reply


help with leds and ohm resistors?

Im trying to make custom headphones from scratch, inspired by the daftpunk helmet of guy, and i want an led lightshow on my headphones. ive been researching how to do this, but ive heard that having an m3 or any kind of audio player wouldnt be enough power to support the leds? ive also heard that if you solder the leds straight to the wiring of the headphones if can create a short, and that placing the led on a circuit chip would help. however i know nothing about ohm resistors or circuit boards. i was thinking i could use an ohm to amplify the power from the audio player to support the leds if its even possible, and running wire through the headstrap to  solder the circuitboards with the leds on them. i need help. alot. any input is wanted, thanks! (ps: - does anybody know how much power i need to run a single blue led?)

Question by gabrielguy   |  last reply


How to hook up a microphone to sound responsive led circuit?

I want to make a deadmau5 helmet for a friend, and i want the eyes to light up. i have an old circuit saved from speakers like this: http://i1.expansys.com/img/b/127994/premier-systems-travel-ipod-speakers.jpg except the speakers light up in response to music. I gutted the speakers a while ago for another project, but the leds from it still light up when plugged into an ipod. I would like to hook up a mic to it so that it will light up to noise instead of having it plug into an ipod, however the mic only has +/- terminals from what i can tell, and the headphone wire-input has 3. Im no EE, is the green one supposed to be the ground, and the red/copper are the +/-?  here is the mic i am looking at: http://www.radioshack.com/product/index.jsp?productId=2062216&filterName;=Type&filterValue;=Microphone+elements here is the circuitboard (i circled the wires in question):

Question by kamikaze33   |  last reply


Video/Photog Lighting - COLLABORATE on homebrew Light Panels!

This is the link to the pro version of my project http://www.litepanels.com/ Basically, a light panel is a panel of evenly spaced super bright LED's that you can then mount and place like traditional lighting around your setup. In an ideal world Brightness of 5200K + would be a good place to be. However, I've just learned that lightpanels actually only put out 4900K. And they're crazy expensive. These replace the HUGE softbox and/or Umbrella + lighting combo+ power setups. So, my suggestion for a group project here is to ... teach ourselves how to make a grid of superbright LED's, arrange them into this matrix, and add a dimmer switch in order to alter the quality of the lights. If this is something anyone is at all interested in, I would LOVE to collaborate on this project! I just installed the Magic Lantern firmware hack on my camera, and well... the addition of better lighting would help my filming SIGNIFICANTLY.  I'll post my findings, proposed project plan, and 

Topic by Cakeable   |  last reply


Unofficial Patch Contest - Macro Photography AND THE WINNERS ARE...

DoNoTincinerate and myself have decided to trial Eric's idea of awarding patches as prizes in informal contests.We have decided to run a quick contest for members (pro or not) to show off their photography skills.So the contest is... "Best macro shot of an electronic device, component or components"Entries will be judged on clarity, composition and UCF (undefinable coolness factor).Deadline midnight (UK time!), Saturday 20th June.Post entries to this topic and we will judge them on Sunday.Prize: a rosette patch created especially for small contests, awarded entirely at the discretion of DoNoTincinerate and myself.>KK<IT'S BACK ON!Things are resolved, and I have had other good news.Judging will happen at the weekend, new entries will be accepted until Midnight Friday 10th July (based on site time-markers).FINAL UPDATEIt was hard to choose, so I chose three. In no particular order... the winners are...Gmjhowe's chocolate.Munchman's HDD circuitboardBumpus' cell-phone buttonWith a special mention to Kryptonite for managing to photograph sparks.Well done, all four - patches are arriving soon.

Topic by Kiteman   |  last reply


Is reverse engineering illegal?

Is reverse engineering illegal? Well, if you then go on to sell your version? For example, in an upcoming instructable I'm modding some electronics, well, without revealing my instructable here's an equivilent example: Lets say I buy a little robot at the store, it has motors and the case and everything. Only problem is, it runs on AA's and you want rechargable batteries. Also, the wireless module for some reason is external and is super ugly and annoying. You crack open everything and you find that the needlessly large circuitboards only have about 20 (somewhat) easy to find components that adds up to like 2 dollars. Following traces, you recreate a schematic from the PCB (already did this, that was fuuunnn :P). Now you reengineer the board (still same schematic) so that it's much more compact, you've added a little charging circuit (and correspond boost circuit, replacing a couple of AA's with a lithium ion), and you made it all fit inside the robot (no wireless module just hanging around outside the robot. Now, essentially the schematic is the same, but you've added stuff like the boost circuit and charging circuit. You've also added a few customizing features that make it more special (adding LEDs, microcontroller, cough cough etc.). Would it be illegal to sell a board/kit (incase other people want the board and can't solder smd to good) for people to modify there own robot (same model etc.). Also, the schematic from the reverse engineering is very similar to an example circuit in the main chip's datasheet, and a few other parts are common sense (like some resistors here and there, LEDs, a few extra filtering caps), so the company's circuit is nearly identical to the datasheet, is this illegal to sell?

Topic by guyfrom7up   |  last reply


Need Party Ideas...

As many of you might remember, on 1/31/07 a terrorist group, in a coordinated attack against the people of this great nation, attached devices that contained circuitboards, flashing lights, and batteries to buildings and bridges in 12 major cities across the US. In 11 of these cities, the devices were largely ignored and people went on about their business as usual. But in Boston, someone decided that a circuit board with some lights in the shape of a cartoon character must be a bomb. The city was quickly shut down as they closed the subway, bus system, and several bridges and building were evacuated. The city was in a state of panic! Was this another 9/11? Were these sinister devices really dirty bombs meant to kill innocent civilians? By the end of the day, Boston had spent over $1,000,000 (yes, i said million) dealing with the devices. Who could have launched such an attack on American soil- Al Quada? the Taliban? North Korea? nope... Turner Broadcasting Group. They paid 2 artists $300 each to make what ammounted to a childrens toy known as a Light Bright to be used as guerilla marketing for the upcoming Aqua Teen Hunger Force movie. Rather than admit that they overreacted, the city of Boston sued TBC for $1 million in restitution and another $1 million in good faith money. The two artists who only did what they were paid by TBC to do, were forced to do a combined 140 hours of community service. I'm having an Aqua Teen Hunger Force marathon on the evening of 1/31/08 as a memorial to the freedom that we as a nation have given up in the 2000's. Americans as a whole have a hard time understanding that the terrorist do not intend to kill each and every one of us with bombs and plane hijackings. They seek to control us through fear. The city of Boston was so afraid that they completely shut down the city because of a lightbright hung on an overpass! Sad as it is, the events of 1/31/07 are an indication that the "war on terror" is a losing one. http://www.youtube.com/watch?v=7kdP8WBB4lI I said all that to say this: I'm looking for some ideas for my ATHF marathon party. I'm working on a lighted 'mooninite' for the front yard, and I know I want to incorperate the governments 'terror scale' (you know the color thing) somehow. I am also asking each guest to bring one harmless-yet-contraband item that I can confiscate at the front door much like the airport security. If you have any idea for other tasteless things for the party lets hear them. The less P.C., the better!

Topic by Handsome-Ryan   |  last reply