Hey guys, I want to buy a external battery for my iphone 5, but i dont't know what brand to buy. do you have any suggestions?? Make sure if any external battery to iPhone 5?
Topic by nevinweeks | last reply
I have made a prototype PCB board which requires connection to a 9V battery or a wall-wart. The board is very small and doesn't have much extra space. I'm currently using a female header(as used in arduino) with 2 pins broken off into which I'm plugging in the wires from battery. In the final board, I want to be using some connector which is widely available, and PCB friendly. The one which I have most commonly seen being used is the wall-wart female power jack which is way too big for my requirement. Any popular option which is only slightly bigger than a snipped female header? -Antzy
Topic by Antzy Carmasaic | last reply
Hi guys, I have tried looking around to buy a 5 x AA battery holder but unable to find one. As such, how can I make my own 5 X AA battery holder? I have a 4 x AA holder and a 2 x AA holder.. Is there any way to combine this two and make it a 5 x AA holder? Or can I use a 6 x AA holder and modify it to a 5 x AA holder? Thanks for your inputs.
Topic by kurtselva | last reply
Hey all, I have never really done much circuitry to this date, but I was hoping to make a fairly complex lamp that may require a good dose of it. What I'm looking to do is wire four cold cathode tubes (12V, the kind that are used to light computers), as well as two LED lights with arduino based flicker control, and run them off of a wall socket? The pictures are a (very) rough sketch of the setup, as well as a supply list. Is there any way someone could explain what this might require to me in baby terms? All the best, Adrian
Topic by am_rawr | last reply
Hi, This is my first post. I don't know much about this kind of tech but am eager to learn. I want to build a hidden/discrete wireless earpiece which can play a short burst of white noise (1-2 seconds) when a button is pressed (see below for an explanation of why on earth I want to do this). The button would need to be able to trigger the white noise from a range of around 1 metre so that the controller can be kept in my trouser pocket. There are earpieces around which play white noise (to help people sleep in noisy environments) but I want to be able to control whether or not the white noise is playing. I thought about using a wireless earpiece (e.g.) with bluetooth, however it seems like the maximum range for this would be around 40cm. Anyone know of alternatives? WHY WOULD I WANT TO?! Individuals who stutter/stammer often experience blocks. It's not that you'll hear them repeating sounds or anything - their speech just totally freezes up. For reasons which aren't entirely clear, listening to white noise can help stutters who block to start talking. White noise can be played before trying to speak, disrupting our auditory feedback - resulting in less blocks. Some devices have made use of this, e.g. Edinburgh Masker (http://www.mnsu.edu/comdis/kuster/edinburghmasker.html), but were ugly, bulky and didn't allow you to manually control when the white noise was playing. Other devices, like SpeechEasy make use of Delayed Auditory Feedback (http://en.wikipedia.org/wiki/Electronic_fluency_device#Delayed_auditory_feedback) - which can help some people but is of no use if you aren't already making some kind of noise. Is this impossible? Many thanks for anyone with ideas on this! Cheers Oli
Topic by ocheadle | last reply
I need to make a batch file change the directory to wherever it is currently stored. I know how to use the "cd" command, but I don't know how to get the current directory of the file. Can someone please help?
Topic by metrogdor22 | last reply
Hello there. I just broke my 16GB Strontium Pollex drive and I'm left with nothing but the circuit board (Pics below). It doesn't fit into the USB port (too small, push up=on, remove support=off) smugly, and well, this is my only 4GB+ flash drive (I have another broken 1GB one, but at least it doesn't wobble around in the port). What do I do with this to make it usable again?
Topic by NSDCars5 | last reply
Hi, I'm new here so sorry if I'm doing something wrong or have posted in the wrong place! lol I'm trying to build a CD player using an old CD-Rom drive from an old PC. I've done some research to into how to power it, but everything I've found seems really over complicated and involves big power supply units and stuff. I got this idea that I could use a 5V ac adapter from USB phone charger, and connect the red and black wires from the USB lead to the red and black of a Molex 4 pin thingy. Then a 12V ac adapter and connect the wires to the yellow and black of the molex thing. As you can probably see, I don't know much about this kind of stuff, but i understand that the red wire on a molex 4 pin thing is the 5V wire, and the yellow is the 12 V, so if i connect two adapters to each of these should it be suffiecient to power my CD-ROM drive? Thanks for any help, and sorry if this is a stupid question!
Topic by DomHawthorn | last reply
Hello everyone, Ziphius is an aquatic drone controlled by your smartphone or tablet. Although we are still in stage of development, we already have a fully functional prototype. This prototype has a Pi and Arduino inside. Right now, we are using Unity for the games development. It will be available to both Android and iOS. If you're interested, check our video: http://www.youtube.com/watch?v=RDlNh2fgUpo Your feedback is very important for us, specially now that we have been selected to be one of the semi-finalists on the Insert Coin competition, organized by Engadget. engadget (dot) com/2013/02/15/insert-coin-new-challengers/ Thank you.
Topic by Roaz | last reply
Can someone please tell me about the capacitors i should be using in this schematic? Like i know i need a 0.01uf but what type of capacitor? and (V)? also what is a 6pF? Last question is about the #16 wire.. Im guessing this is just a inductor i can make by wrapping it around a pen 6 times? but do i use magnet wire or any old regular copper wire? thankyou.
Topic by andrewlapham2010 | last reply
The situation: I'm prototyping a circuit with a 14-legged logic IC on a breadboard. What happens: The picture tells it all: The breadboard looks like a Spaghetti Incident. What a mess. It's hard to find the right holes between all the leads sticking out, and avoiding shorts is even trickier. And of course: The circuit doesn't work. Not suprising considering the chaos. No biggie, but debugging a circuit on such a breadboard is a real pain! So please: Share your tips / tricks / magic to keep a proper and readable circuit on a breadboard. Thanks! Ynze PS: The circuit is not very complex btw. It's a solar engine, with one logic IC (NAND gates) and about 15 other parts. The circuit does contain feedback loops, which make it a bit trickier...
Topic by ynze | last reply
Wife owns a very expensive piece of Japanese cosmetic device that uses a very special Li-ion battery pack but the battery died! No way I can find a replacement for the battery pack. The battery pack available only has 2 wires (black and red) but not 3 wires (the yellow wire). I am afraid if I get a 2-wire battery pack, it won't work at all. There are lipo battery packs, but I don't think I can replace li-ion with lipo battery packs?! I am wondering how to convert it to an AC power? I have no experience doing this at all, so if you can provide as many details as possible, that will be great! The battery pack: 3 wires connected to the connector: red, black and yellow; 7.4V, 750mAh The AC adapter used for recharging the device: INPUT: 100VAC 50/60 Hz 8VA OUTPUT: 9VDC 500mA Thanks a lot!
Topic by car2i | last reply
Hi guys, I am building a low battery indicator which lights up a red led when the voltage remaining is 2 days before the battery dies. The device draws about 1ma all along and 50ma for about 10 seconds every 6 hours. So how do I check when the battery would have enough voltage to last for 2 more days? i have attached the battery current performance
Topic by kurtselva | last reply
So, in a fit of optimism I decided to rebuild a Ryobi One 18v battery pack for my drill. The task seems rather straight forward except that I can't gracefully remove the soldered tabs on top of the batteries that actually make the circuit and connect to the wires. In the past, I would have removed something like these tabs by either holding the soldering iron to them to melt the solder, slicing the solder with a razor or a combination of the two. These tabs, however, are seriously attached. They won't pry or slice off and the metal of the tab begins to melt before the solder does if I try the iron. I think anymore heat will damage the battery themselves. Now, it's been a while since I did any electronics work but after a couple of tries I remembered which end of the soldering iron to pickup. I don't think I missed anything. It just seems like these tabs aren't attached with run of the mill solder. Has anyone had this problem (and found a solution) or am I just missing something blindingly obvious?
Topic by shannonlove | last reply
I have an old white xbox with a broken disc drive which if I fix I will give to one of my friends. The plan though was that before giving it to him I'd spray paint it red and stencil in the yellow the hammer and sickle onto the top. My second idea was then to use the steps found in this guide: https://www.instructables.com/edit/new?type=forumTopic&categoryGroup=forums&category=burning_questions to record the Russian national anthem onto the board, and then wire it to the power button so that it would play whenever he turns it on. Do any of you have an idea on how to go about wiring this to the xbox's power button?
Topic by gibby02 | last reply
Hello there Everyone! I am trying to Do a project where I can use Small LCD screens (perferably a CVS disposable camera 1.4" TFT screen) The problem is I'm not quite sure how to go about hooking them up to a RCA, or S-video input. My whole project hinges upon me getting a good LCD or OLED monitor as they need to be fairly high quality. I cannot seem to find many small LCD or OLED suppliers out there so I am hoping this can be done with the disposible. I would also like to ask if anyone does have information on where to buy small, detailed LCDs that can receive RCA. I considered using a cell phone screen but it seems that you need to break down an analog RCA input and digitize it to be viewed on the screen, something that needs a beefy micro controller and programing knowhow, of which i have neither. Please lend a hand, and you may see my first instructable, of something rather awesome.
Topic by TheBestJohn | last reply
Anyone have any clue what this tool was used for or what it is called? It was found in the dirt on a farm. I will attempt to describe as best as I can hoping that this will help after you see the pictures. It looks like the main piece is like a large needle with an eye at the one end and a point at the other. Then there is a curved hook sideways to the main piece (see the shadow on my leg). The hole/open portion in the middle appears to be some sort of clamp. When you press on the tab piece that is closer to the eye, the hole opens up, releases the pressure on whatever may be inside the hole.
Topic by jtaylor69 | last reply
Hi there! I need some help constructing a circuit to charge a lead acid battery. The ratings of the battery are: 12v, 7Ah(Or so). The circuit must have the following features: -> Must be fairly simple (Considering the fact that i don't get all the components easily in the place i live, not even online) -> Must automatically cutoff when the battery is fully charged(Or near full). -> Must also have an indicator, (like the ones we have in a digital camera battery charger, which shows RED LED=Charging, GREEN LED=Full, something like that). -> Charging times can be fairly reasonable (Few hours for a full charge sounds reasonable). -> Hopefully, some explanation on how the circuit works. ;) Thanks in advance :)
Topic by charmquark | last reply
I am making a "party cooler" i want to add a fm radio and aux port and a usb charge station for atleast 3 devices one multi color time changing led and a removable flashlight white led for the inside (nothting fancy), i have 4 6x6 solar cells rated at .5v 3.5w 6.89a i also want to have the battery bank be able to be plugged in to the wall. i am having problems determining the type of battery to use in the bank (rechargable) i also want it to work for atleast 5 hours(not including device charging), (avg kegger/bonfire/beach fun). if anyone knows what i can add to this thing that would be helpfull. i was thinking of AA batts or possibly a few cell phone batts but if their is a better way. the speakers are 3w each running 5v i havent ben able to determine the fm reciever as of now. or a 3.0 usb charger do the volts and amps have to be specificly 4.7v 5a? or does the +- 25% still apply. if any one has any references to help with simple pcb or freeform wiring are most portable speakers/radios rated 5v? (was in a car accident, lost alot of brain buzz.. be nice (used to build beam bots :P) i would like to try to pick up the basics if anyone has any good refrences. circuit/ electric theory. 38 can cooler bigger rubber wheels will be putting the batt bank on the side under the handle.
Topic by CD_tatro | last reply
So I am trying to set up a table with several LEDs (upwards of 50-75) that will almost all be wired with a switch individually, so that patterns can be created by switching on and off each of the LEDs. I know enough as to set up the switches and LEDs, but I am not sure the best way to go about powering it. I want to be able to plug it in to a wall and not use batteries. but what kind of converter/board would I need to power everthing? Thanks
Topic by PUR3insyte | last reply
Hi there. I recently got a Picaxe 18m2 project board and I want to run up to eight servos off it, if thats even possible. Would I need a separate servo driver/controller for that number of servos or perhaps a different microcontroller? Any examples of code for operating more than one servo at a time would be appreciated also. By the way, apart from reading 'Robot builders bonanza', my technical experience consists of operating 'Bigtrak' when I was about 12 and changing the odd plug. Cheers.
Topic by jonnymelon | last reply
Okay, so im into making little batch files etc. but one thing keeps on confusing me. whenever i check out a tutorial, it comes to destructive commands. so we get to DEL C:\ okay so that clearly wipes the c drive. but when trying the command on a victims pc. it always asks for confirmation! so whats the point in making the virus in the first place if the victim has to say yes to activate it?
Topic by mirielle | last reply
Does anyone know or can tell me where I can get information on how to get High Powered LED's to alternate flashes like wig-wags for a vehicle?? Wondering what I need and how to wire it. I really wanted to have about 3 or 4 high powered LEDs (either Luxon Stars or something of the sort) on one side and 3 or 4 on the other side, and each side to alternate flashes back and forth. I need help at a beginner level and Any help is greatly appreciated. Thanks
Topic by CrazyBob62 | last reply
I'm building a film scanner using a dlsr. Here's a picture of the rig so far: Basically there's a light source, negative stage, negative holder, camera support stage, camera and lens. I put a negative in the negative holder and slide it using a guide such that I can take a bunch of pictures of the negative at 1:1. For example, it takes 25 pictures to cover a 6x7cm negative. The individual files are then combined into one file using stitching software. The system works very well, but it's a bit tedious. I'd like to automate the negative movement using a diy motorized xy stage. Many of the designs I've seen are for much bigger units, such as for a cnc machine, or units that require speedy movement. That's not the case here. Each movement would be only 10-20mm. I'm fairly handy, and I can follow directions/recipes well, but I haven't worked with arduinos or stepper motors before. Any advice or suggestions on a good way to accomplish my goal would be very welcome!
Topic by pdesmidt | last reply
Hi, I am attempting to add this 5M 3528 LED strip to a dress, ideally I would like it to run off a battery power supply as I want to be mobile. I am very new to this LED experimenting, so any help would be greatly appreciated. here are the LED strip description Superbright 3528 SMD Red Green Blue(RGB) LED, high intensity and reliability Waterproof flexible LED strip 60 SMD Red Green Blue(RGB) LEDs per meter, total 300 LEDs for 5 meters Self-adhesive back with double side adhesive tape Maintenance free, easy installation Every 9-LED cutable without damaging the rest strip Flexible ribbon for curving around bends Ultra-bright but running at low temperature Input volts: DC 12V (12V 2A for 5meters 3528 300LED light strip) Viewing Angle : 120° Long life span 50,000+ hours Can I get away with powering it with a simple AA Battery power supply like this: http://www.ebay.com/itm/170470242640?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 or does it have to be something more heavy duty like this: (and would this get to hot to carry as a power supply on your body?) http://www.ebay.com/itm/12v-10ah-Sealed-Lead-Acid-Rechargable-AGM-Battery-Power-Patrol-SLA1097-/140718332819?pt=US_Rechargeable_Batteries&hash;=item20c3775b93 Thank you for your wisdom and time.
Topic by allofasutton | last reply
Hello all, I'm dont have much basic knowledge about electronics and I got a problem. I've built this exact Instructable: https://www.instructables.com/id/Build-a-Thermal-Flashlight-Light-Painting-with-T/?ALLSTEPS I want to drive a 1m RGB LED strip with it so I've changed the NPN transistors to stronger ones that handle 0.5 A, it's the only components that are different. These are the exact NPN transistors: https://www.elfa.se/elfa3~eu_en/elfa/init.do?item=71-014-58&toc;=0&q;=BC337-25 Problem: the circuit works fine with ONE RGB LED but it does not work with even the smallest bit of RGB-strip (3 emitters). Goal is to drive a 1m strip and that consumes 14.4W @ 12V. Im using 12V 1A adapter for the Arduino and another 12V 2.5A for the LED-strip. What am I not understanding?
Topic by ronnlund | last reply
I've been looking online recently for some sort of "glove" that you would wear for gaming, instead of having a keyboard. Didnt really find anything.. at least in my price range. So i am going to get the Makey Makey tomorrow from a trade with a friend, i figured this was my best bet. My idea for this glove would be that it have either foil on the tips or that sewing yarn that can be used as wire. There would be a thin Aluminum Sheet that you would tap with the appropriate finger. The aluminum sheet would act as the ground. My other idead would be instead of having the Aluminum Sheet have the tech yarn in the palm of your hand, but this would get uncomfortable after time. I want to make this so i could possibly in the future have two gloves one for each hand. Also, if i was to use the special yarn for electronics, i would have to wear to gloves since the yarn would weave in and out of the glove grounding to your finger. Most likely going to be working on this tomorrow or as soon as i can get some cheap gloves. I'll upload pictures then. any suggestions?
Topic by Blake_surovik | last reply
Hi guys! I have a little project that i could use some help with. I am quite new to the arduino, and not that steady in the code, but im hoping on getting there! The project im building is a litte controller that drives a relay output. The controller is connected to a photo-cell that has a two pin output. This output is shorted at various times depending on the movement in front of the photocell. What i need is for the arduino to close the relay for the same period (say 0,5s) each time the photocell circut is closed. And maybe block a repeating signal from the photocell within 0,5s Is this possible in some way? Any help much appreciated!
Topic by maceide | last reply
Hi, I have an arduino UNO and RTC DS1307. I want to make an alarm that just displays on the serial monitor of arduino UNO. I can make the RTC show the right time on the serial monitor, however I want an alarm to go off on the serial monitor. Also, is there any way that I can change the alarm time on the serial monitor? Like I can type from my keyboard and the time changes? One more question, How can I make arduino do multitasks using RTC. Like when the alarm goes off, it can run a small DC motor and also a Pizep Buzzer. Please help me with this, as I desperately need a help :((
Topic by Bam Boy | last reply
Hi guys, I am quite noob in electronics. I would like to know how to determine resistors and zener diodes values for a battery life indicator similar to this :https://www.instructables.com/id/9v-battery-status-indicator-circuit/ And if I want to use a battery source of 1.5V, how will the values change? Thanks!
Topic by kurtselva | last reply
Another Big Update! We've come a long way since 'How to Build a Qwik-Solar' (Over 9,000 views - Awesome!). Qwik-Solar has now 'grown up' and become the iPower Station, producing more power - with easy to assemble frame kits and complete power packs. They can charge any power pack with a 12 volt outlet and include key safety features (switches and fuses) for worry free use. We've made it one of the best portable solar generators which can be used for cookouts, camping, tail gate parties, and emergency power. For industrial mobile solar power - We've teamed up with McGivern to provide solar Work Pods - with up to a 1,000 watt array! Last, we have Suntigo micro-grid kits for homeowners (with exciting news coming soon on new systems!) iPower Stations are available from 45 Watts up to 85 Watts, with or without a power pack. Find all our solar generators here: Solar Mak And Thanks to everyone that's made Qwik-Solar such a success!
Topic by Jonlo | last reply
I have been exploring wast of creating a random motion from a gearbox, i need this for a segment of a kinetic work i have been doing for some time now. random motion seems somewhat difficult to achieve so i came to the conclusion of using magnets! the gearbox i am working on at the moment works by orbiting one magnet around the other, the central magnet spins the output shaft while the orbiting magnet performs many rotations around the central magnet tugging it to different positions giving an almost random movement (patterns can be found). i was wondering if there were other maybe more effective methods of achieving random patterns of movement without the use of electronics.
Topic by rustlabs | last reply
Hey guys, Im starting to build a 2 axis CNC for a laser. I was going to try the DVD burner laser and just cut through some paper for now but im wondering what the capabilities of the higher wattage lasers are. I know there are several 1-2+ watt lasers on ebay, what could they mange to cut through? Could I cleanly cut cardboard? What about vinyl for making stuff like decals and stickers? Im wondering if spending the extra money on a better laser would be beneficial or not so if anyone has some good comparisons or ideas let me know. Im on a tight budget for this build so a co2 laser is WAY out of the question. This is my first CNC build so its mainly to learn but the more capabilities of the CNC the better.
Topic by jdavis-9 | last reply
Dear Sir, We are a marketing company in Saudi Arabia . We are interested in buying a customized LED cube for a project that we are handling now. The LED has to be one meter in length and one meter in depth and 2.5 meters in height. Please let us know if it is possible to build it and give us a quotation on that. Regards, Amal Alsayegh Marketing and PR rep. Zone Arabia firstname.lastname@example.org
Topic by AmalZone | last reply
New to the forum so if an inappropriate post i apologize in advance. I am looking for or to build a simple device that will allow me to start and stop windows media player. Right now I have a simple batch file that opens windows media player in the full screen modes and plays a single video in the playlist. When it is finished it runs taskkill and closes. I use a wireless mouse to access the desktop icon that triggers the batch file. I would like to have a device that is plugged in with USB or wireless and has two buttons. One to start the video and one to stop it if I need to end it before it is finished. Ideally they would be big buttons labeled Go and Stop or colored Green and Red. I want children to be able to operate this computer. Does anyone have a clue if this exists in some form already or if it would be difficult to create? Thanks nerdoboy
Topic by nerdoboy | last reply
N00b question: I've got an RGB LED that has a forward voltage of 3.7v and a 3.7v battery pack. I want to trigger the LED to light via a magnet and reed switch. If I wire the reed switch to the gate of the SCR and have the SCR power the LED, will I be able to turn the LED on and off via the magnet by bringing the magnet near the reed switch?
Topic by d0ugparker | last reply
Hello, Some friends asked my wife to do a birthday cake for a girl of eight years. With her Âage she is crazy about princesses. Well, what came to mind was that despite having done many projects with Arduino i had never applied electronics in a cake. So we decided to join forces and add some light (RGB LED) and movement (DC motor controlled with an L298) to the cake. Here is the link to the video: http://www.youtube.com/watch?v=TmL1nR2-uEQ&feature;=youtu.be
Topic by pmartins4 | last reply
I want to be able to display a webpage on to a large monitor. (so people can view the site when they are outside for example) The website would update in real time (ajax based) but is essentially pretty basic just some images and text (no flash)/simple design. I have had a bit of a look around at supplier sites and most seem to have their own system where you can add in images/videos to display, or a program where you can input data yourself. I was looking at was something like Samsung smart TV but I think this is to good for what I need as I want to keep the price down, or Opera TV but I am not sure if I am looking in the right direction. I don't really want to have a lap top connected to this device (and be connecting via a cable) ideally you could talk to the device via a smartphone over wireless/bluetooth. I don't know where to start but I reckon if someone could point me in the right direction here I could make my idea happen?
Topic by ak8500 | last reply
I am in the process of building a jewelry armoire / box / chest (whatever you wish to call it) and I am wanting to add just two LED's that will come on when the door is opened on the jewelry box and they will go off when the door is closed. Having novice skills in electronics and handyman skills in woodworking I was wondering what I would need to accomplish this and if it could be battery powered...
Topic by bigbadjohn81 | last reply
I JUST JOIN THE COMMUNITY RECENTLY.I AM FROM SOUTH AFRICA.I HAVE A PROJECT FOR LED LIGHTS,IT CONSISTS OF 24 WHITE LEDs IN PARALLEL AND I TESTED IT WITH 4 AA(1.5) BATTERIES(6V) AND IT WORKED FINE,BUT I TREID TO DESIGN A 6V REGULATOR SO AS TO USE IT WITH SOLAR ENERGY USING 7Ah BATTERY.I USED LM317 AND OTHERS BUT IT KEEPS HEATING UP EVEN WITH AN EDEQAUTE HEATSINK AND SOME WHERE FRIED,ANY SUGGETIONS,CIURCUTS IN SOLVING MY DALEMMA
Topic by temba | last reply