Lightbox from old scanner

Hi, Ive got a question if you don't mind, im trying to make a light box from a old scanner and im not sure what lighting I should do, what im thinking is to use this ( but im not sure if it would be powerful enough. I was thinking about using t5 but I don't think they would fit as the scanner is really thin about 18mm without the glass in. Also would I need anything in in front of the glass at all? Cheers Phil

Topic by drop_dead_fred   |  last reply

EL wire help

Hello, I was wondering whether someone could shed some light on this. I'm making a coat with a design in EL wire. I want to use two colors, and I want to have them both on the strobe setting, so that they flash opposite the other.. so one color being on while the other is off. However I may have to use more than one 'spool' of wire per color. I have a bunch of 9 ft. segments already hooked up to batteries.  You may have to bear with me, I know very little about electronics.. But is there a way I can hook up the segments of one color to each other so that they all flash simultaneously? Or is it worth it just to get longer segments/ make my own, and would the battery have to be much larger in that case? Thanks, any input is greatly appreciated! 

Topic by ohhelloooooo   |  last reply

Google boss concerned about privacy??

One coolest pieces of technology in the hands of independent Makers is the UAV; students and hobbyists can exceed military spec for drones and quadrocopters for a fraction of the cost.  So it concerns me when Eric Schmidt, head of the company that put millions of people's homes online without asking, and has been fined in several countries for harvesting personal data via wifi, trys to influence American policy makers, invoking the demon called Terrorists Might, so that the use of UAVs is restricted on thd grounds of "protecting privacy". What say you, Makers? Image of Eric Schmidtvfrom AP via BBC site. 

Topic by Kiteman   |  last reply

The same button/trigger twice with Arduino, on/off?

So I'm having the hardest time trying to figure out how to make Arduino do this: if statement == true LED on and if that statement if found to be true again, LED off then every time that statement == true toggle between LED on and off. So how do I go about this?? Thanks!

Topic by HavocRC   |  last reply

LED circuitry help

Hello, I am wanting to make an LED circuit consisting of 11 blue LED's and a 9v battery. Can someone tell me which LED's to use, which resistor to use, how the LED's should be aligned (series/parallel), etc. for this? I do not know electricity very well at all and would rather not screw this up. Thank you

Topic by jgruber1   |  last reply


Hey everyone does anyone know any good ideas for making a portable ham radio transmitter and receiver that can fit inside an iPhone case (the cardboard case you buy them in)? It would be good if it was a kit, but it would be better if it can be made using a breadboard and other bits and pieces. Anyone have any ideas?

Topic by simonyu   |  last reply

Can't repair my computer from the boot menu

I am trying to restore my laptop to factory settings, and whenever I try to launch start-up repair it gives this error message 0xc000000f -- The boot selection failed because a required device is inaccessible. I tried changing the boot order and that still did not work. I have done this on my other laptop and it worked just fine, but this one doesn't seem to working. I have no clue what to do please help. Thanks, Damien.

Topic by Mossi   |  last reply

Making a Cryptuino! Cryptex/Arduino Audio Device project

     So recently many of the students around my college campus that get stuck here on the weekends, myself included, find themselves with nothing to do. Personally i want to do something to remedy this. Hence why im thinking of creating a series of challenges and puzzles all around campus on some weekends. How it would work, device and plan, is as follows: -----      Players would pay an entry fee, of which there would be 5 or less in one group. Either way, small number of people to start off with in the beginning. One player would be designated as the "Handler", and would be in possession of the Cryptuino. The Handler would be responsible for entering the first password so instructions on how to beat the challenge would be relayed to the player/s.      If the challenge was beaten, then the group would be given a reward and a new password, which when played would direct the group to a different area for the next challenge. Once they get to the challenge, the process would repeat itself, and it would repeat for a number of times depending on how many challenges there were.      To make things more like a game, the player/s would be able to score points by completing certain requirements in the challenges. Some requirements would be like:  different time ranges for mazes or races, correct/incorrect answers on puzzles, or other things that i have yet to figure out. -----      Im still trying to figure out how to build the device, especially with the hardware part. I also dont have much cash to spare for good shields and parts but i do have a plentiful amount of electronic junk i could use. From what i was told on the Arduino forums, i would need a .wav shield and a keypad to go with my Arduino Uno. Is there any places on the internet anyone would know of on how to make my own shield and keypad?      I have figured out how to make my own SD card slot for part of the .wav shield, and i have a number of button switches i could use for making a keypad. But to make a working shield/board and keypad, i am mostly clueless on the processes. Can anyone give me some advice or pointers in the right direction?

Topic by EngineerJakit   |  last reply

can anybody tell me why my return command in void loop isnt working?

Int keyscan() {     const int keys[12]={     1,2,3,4,5,6,7,8,9,10,11,12                  };       int r=0;   int c=0;   int keypress=99;   int ColState = 0;    //variable to store column state, 0 = low } const int led2pin = 10; const int led3pin = 9; const int led4pin = 8; const int buzzer = 12; const int LidSw =  13; const int ROW0 = 7; const int ROW1 = 6; const int ROW2 = 5; const int ROW3 = 4; const int COL0 = 3; const int COL1 = 2; const int COL2 = 1;   int keypress=99;    int r=0;   int c=0;   int ColState = 0; void setup() {   pinMode(ROW0, OUTPUT);   pinMode(ROW1, OUTPUT);   pinMode(ROW2, OUTPUT);   pinMode(ROW3, OUTPUT);   pinMode(COL0, INPUT); pinMode(COL1, INPUT);   pinMode(COL2, INPUT);   }   void loop()   {while(keypress=99)   {               for(r=0; r<4; r++)                          //loop for 4 rows     {       digitalWrite(ROW0, HIGH);       for(c=0;c<3;c++)                          //loop for 3 columns       {         ColState =  digitalRead(COL0);         if(ColState==1)         {           digitalWrite(ROW0, LOW);  //reset row           tone(buzzer, 450, 500);           ColState = 0;                //reset ColState variable           keypress = ROW0+COL0;    //identify key pressed           delay(500);                  //debounce         return keypress;         }       }       digitalWrite(ROW0, LOW);     }   } }

Topic by endara   |  last reply

Can someone please help?why does it say ROW0 was not declared in this scope in void setup?

Can someone lase help?why does it say ROW0 was not declared in this scope in void setup? int keyscan() { const int led2pin = 10; const int led3pin = 9; const int led4pin = 8; const int buzzer = 12; const int LidSw =  13; const int ROW0 = 7; const int ROW1 = 6; const int ROW2 = 5; const int ROW3 = 4; const int COL0 = 3; const int COL1 = 2; const int COL2 = 1;   const int keys[12]={     1,2,3,4,5,6,7,8,9,10,11,12                  };   int r=0;   int c=0;   int keypress=99;   int ColState = 0;    //variable to store column state, 0 = low } void setup() {   pinMode(ROW0, OUTPUT); }   while(keypress=99)   {              for(r=0; r<4; r++)                          //loop for 4 rows     {       digitalWrite(rows[r], HIGH);       for(c=0;c<3;c++)                          //loop for 3 columns       {         ColState =  digitalRead(cols[c]);         if(ColState==1)         {           digitalWrite(rows[r], LOW);  //reset row           tone(BZR, 450, 500);           ColState = 0;                //reset ColState variable           keypress = keys[(r*3)+c];    //identify key pressed           delay(500);                  //debounce           return keypress;         }       }       digitalWrite(rows[r], LOW);     }   } }

Topic by endara   |  last reply

Converting at 9V solar panel output to 5V using diodes and voltage regulators

Hello i was recently sold a solar panel which was the wrong voltage i need to step down the output from 9V to 5 or 6V. I have been given two TA7805S voltage regulators and 6 diodes and told i can do it with these but i don't know how any ideas?

Topic by henrycrone   |  last reply

home automation

I finished a project to control lights and window with pic18f2553  i programmed it on c++ every thing is going ok but the problem is when i connect the window (with up and down) the first command start but when i stop that command the program freeze

Topic by thijaz   |  last reply

help me learn and create a multi purpose controller

Hi all, I want to build a hardware controller that has a few switches/buttons and will communicate with the pc via usb. The purpose for this is to control  software, for me its DAW's, but could easily work with games, video editing software etc. Step 1 materials/parts Looking for *pressure switches (is that correct?). I want velocity sensitive switches *rotary switch, something like a joystic with X|Y|Z movement *what kind of electronics, circuits, etc should these connect to? Step 2 connecting to a pc / communication * how to program the controller, are there any SDK's for this? I can use any pointers for learning,cost effective  suggestions, inspiration from similar projects etc Thank you in advance

Topic by pozitronios   |  last reply

Multiplexing and DeMultiplexing

Hello, I first was wondering if anybody knew anything about Multiplexing? if so then you will understand my question here :) So basically I have this crude diagram that will explain what i'm talking about: now my problem is I now have 9 control signal wires, is there any way around this? Again if you know about multiplexing then you should hopefully understand my question, based on the diagram.  thanks for the help :)

Topic by mrn   |  last reply

Ingenuity Needed: Cutting records with quality.

It's lengthy, sorry, but it's worth it! Let me preference this with, I know this topic has surfaced before. Most of the forums and pages are filled with broken links to information, sold out products, and are all around rather worthless to return to. I'm posting this in hopes it stays a useful reference point. For  a few years now, I have been looking at cutting disks playable on a record player. I found an 'ible a while ago (the original one I bookmarked has been removed) that showed how to make an needle assembly. It demonstrated making a record engraver by putting a staple through the center of a speaker. This tool kind-of worked, but had some quality issues, as well as speed. When you push to engrave the audio, you slow the table. Less pressure, less quality, more quality, less speed. The other issue I ran in to was keeping the groove tight enough to hold more than 20 seconds. I'd like to construct a device that will cut CDs in to records with a good bit of accuracy, and give a second life to mis-burned disks (as well as some ancient unsupported linux disks...driver disks...early Windows builds...AOL get the idea) Putting the proper spindle on a properly geared motor should resolve the speed issue on cutting. Having the cutting arm on a servo should resolve the length issue, my only quandary is quality. ~~~~~ So, the point of this post, and the thing I'd like to have some input on is, How do I construct a cutting needle, that will offer some quality. I should refine that a little more - something that is going to transfer bass well. ~~~~~ I was not eager to puncture a speaker, so I modified the original plans. I placed the staple in a layer of plastic, and glued this to the speaker. The plastic gathered more of the vibration, and funneled it to the cutting head more accurately. This did work relatively well, but I feel with a few extra minds, this process can be made better. If this project ever sees the light of day, I'll make an 'ible, and cite any assistance. -Spence

Topic by mr monoply33   |  last reply

How do I make a Headphone/Microphone hub...

Hello, I'm a tabletop gamer and I have a problem. My problem is that sometimes I play at gaming rooms and there's usually a lot of noise there. What I was wondering is, is there an easy way of making a Headphone/Microphone hub that players at the table can plug in their headsets and thus ignore most of the ambient noise from the other people around them? I have an understanding of electronics and how to work with them. I just don't have the finer knowledge of how to actually make stuff from scratch unless I follow a blueprint with listed components to use. What's needed is something the "host" (be it a Gamemaster or the one who's running the game) can plug his microphone headset into and the players at the table as well (let's say 10 players, so that's 11 headphones and 11 microphones). And the host needs to have a means to talk to just some players at various times, and each player must in turn have the ability to speak to the host as well.  I'm certain this gadget or something similar is or has been made at some point in time, kinda like the conference tools corporations use for their meetings, just a little lower tech than that, and it needs to be easily transportable. I would be grateful for any help on this matter.

Topic by hnakkabuff   |  last reply

Can we request an instructable? Helmet Intercom?

So i was wondering if anyone could create an instructable to make a helmet intercom system. I recently bought quads and its hard to hear eachother screaming at the top of our lungs. I know there are kits you can buy that fit two-way radios with Push-to-talk options, but I was hoping I could just make it considering the kits are EXTREMELY overpriced. I was thinking of buying a 4 pair of cobra walkie talkies and would need an easy to craft earphone, microphone and push to talk button that would plug into the walkie. Thanks!

Topic by fabes253   |  last reply

Arduino UNO R3 SMD Uploading Error on Widnows 7 64bit

Hi, I just Installed Arduino UNO R3 SMD to my Windows 7 64bit. and getting     avrdude: stk500_getsync(): not in sync: resp=0x00 error when uploading I'm sorry if it is a old problem solved somewhere in this forum. But last couple of hour i couldn't find it. Please see attached image for better understanding. Thanks Farness

Topic by farness   |  last reply

Problem with low battery indicator

Hi guys, I have built a low battery indicator circuit for a 6V battery source. It will light up a led when the voltage reaches below 5V. The 6V battery source powers a servo motor, which is controlled by a microcontroller. The problem I have is that when the servo motor rotates, the led lights up. And when the servo stops rotating, the led goes off. This happens even when the battery is above 5V. Any idea what is wrong? And how I could rectify the problem? I have attached the circuit of the low battery indicator, if it helps.

Topic by kurtselva   |  last reply

Help needed making a pause system for smartphone headphones

Hi guys, I'd like to take an existing pair of headphones (not a specific pair, I can buy a suitable pair if this will make things easier) and implement a switch that will automatically pause my android music when a switch is pressed. Specifically, I'd like the music to pause when a circuit is broken. Since Android will automatically pause music when the headphone jack is removed I can't imagine this would be too difficult to build. However I would also like the music to automatically start again when the circuit is closed again. I'm not overly tech savvy but I think this project is within the realm of my capabilities! Any thoughts or help would be much appreciated! Regards, Tig

Topic by tig5   |  last reply

New scrolling banner

The scrolling banner on the home page looks nice but...... while i am looking through the topics, the banner changes and the page jumps up or down. to fix this, make ALL banners the same height. thanks

Topic by ronhenderson65   |  last reply

Bluetooth relay to control water pumps, lights, etc

Is there an inexpensive way to control a water pump or light or other device needing only to turn on and off by using bluetooth?  What I see in my either a computer or tablet having a bluetooth sender - either built in or a usb dongle...and, for example, an aquarium water pump with a 3.7 or 5 v relay to turn it on and off coupled with a bluetooth receiver.  The computer or tablet would have an app to control the device - with timer software.  I have seen bt dongles that can be purchased for as little as $2 in bulk...low voltage relays also for cheap.  I envision a "box" about 1cm by 3 cm by 3 cm that a pump or a light could be wired into and costing about $US 5 to make.

Topic by haopengyou   |  last reply

Help with battery charger circuit

I have a slot machine with a 3.6v rechargable lithium battery on motherboard. The problem is the battery goes dead after about a week and the settings are lost. I want to attach a solar battery charger to it so I do not have to leave it plugged in. Could I run the output of the solar charger through a comparator and then to the battery while it is still in the circuit? The panel puts out around 3v in the room I want to use it. Would this be enough to power an op amp? Then when the battery reaches a certain voltage the comparator changes output and stops charging.  If so, would this work? Any advice on how to build the circuit?

Topic by aballworth   |  last reply

mini fridge upgrade

Hello everyone, I found a Thermoelectric mini fridge at the dump a couple weeks ago and so far I have been disappointed with how cold it gets so I figured I would replace the peltier chip with a higher wattage one, the original ran on only 12v with 60watts but the new one uses 16v and 192 watts, so unfortunately when I switched the chips the fridge makes a clicking noise presumably from drawing to much current. the questions I have are, how can I build or cheaply obtain a variable (it would be nice to control power) 16v 12amp power supply or modify the existing board to output more power, would it pose a problem to run the fridge with no load attached to the previous 12v supply, and is it necessary to replace the fans with higher power ones? any other advise would be much appreciated, thanks in advance :)

Topic by rickyfelten   |  last reply

Arduino true and false statements

So I'm having the worst trouble tying to figure out how to use true and false statements. Can anyone explain how to define something as true and how to use it! An example sketch maybe? Thanks!

Topic by HavocRC   |  last reply

How can i Start Kayaking... Where i can find a sea kayak blue print

Dear experts and friends. me and my friend planning to do a expedition of country (Bangladesh ) cross with kayak within 60 days. problem is: 1. In here we dont have any expert of kayak. because we dont have any culture of kayaking. 2. Thats why we cant find any instructor here :( our bad luck. but we are not hopeless. we want to do it. 3. In here its quit impossible to find a good kayak which will suits us. 4. We are planning to make it...but how ,still we dont know :( thats why we are looking for help. 5. For this expedition what we need to carry and how we can manage idea :( 6. What measures we should take 7. What will be the first step to do this and more...... Why wants to do: We love Adveture Now we are doing sort of cycing and Trekking ... we want to introduce Kayaking in our beautiful country . Basically Bangladesh is river base country ...About 800 hundreds Its situated bank of Bay of Bengal. This rivers are dying because lack of knowledge, very few knw the eco system (even me ) careness But we believe if river die people will die :( To promote value of river. To help ecosystem To poke government to save our river. and more........

Topic by fsam1   |  last reply

Can Non-Hybrid Cars Get 100+ MPG Today?

  We're not talking about hybrids here; our topic is cars powered by the basic IC-engine that relies on gasoline and not electric motors. Today's gasoline engines are not designed to combust/burn gasoline efficiently. Even with the advent of using high pressure fuel injection techniques that are computer controlled, we still fall short of the mark. Partly because liquid gasoline can't burn, only gasoline vapors burn, and there lies our problem. The same goes for injecting the high pressure droplets of fine-mist liquid gasoline that enters the engine cylinder using our current nozzle ejector technology, it doesn't all burn at the same time! Engine designers assume that these droplets are instantly vaporized by the engine's hot cylinder walls, and then instantly explode/combust when ignited by the sparkplug. Not true, up to 2/3 of the fuel isn't vaporized and doesn't combust until later on in the cycle. The 1/3 that gets almost-instantly vaporized and burns will do so within the several thousandths of a second (Fig-1) it has before the piston moves down its 1/2-stroke (out of today's 4-stroke cycle) completing the engine power-portion of its cycle. This releases power and tremendous heat which indeed vaporizes the remaining ~2/3 of our fuel from its liquid droplet form, but too late. It essentially does so when the power stroke is almost over or the piston is just about ready to move into its up-stroke (2nd stroke of our four stroke cycle) phase. So, because of poor vapo-timing we have 2/3 of our fuel virtually wasted by exploding at near the bottom of the power stroke. This incorrect explosive timing, which happens to most of our fuel, imparts very little energy into the crankshaft because its effective "moment" (a product of explosive force and radial-component distance from crankshaft center) is insignificant by then. Various attempts at adjusting the combustion timing spark hasn't made a significant difference. Even though ~2/3 of the fuel is now exploding and providing a huge force, its small "influence" arm distance is rapidly diminishing to zero, and any huge downward force times near zero arm-length is still zero. Some clarification here, technically thermal-efficiency is not improved, pretty much all of the gasoline gets combusted today. That means the energy of the fuel is almost totally released, but not effectively used. The problem is the timing it takes to convert fuel-injected gasoline droplets into vapor to combust at the correct engine rotational time and extract that expended energy. If you did the math for any size engine rotating at say 3200 RPM, you would find that a 4-stroke engine can only extract that energy from combustion during one of the four strokes. And the time it takes to make that stroke happen is only about 9.4 thousandths of a second or 9.4 milisecs (msecs). Now picture the piston just below TDC, all its valves closed, under pressure and containing all the fuel and air it needs to combust. At this point our deadly cocktail has about half of the 9.4 or about 5 msecs to complete combust after the timed sparkplug ignites it. The half factor exists because the max portion of our power stroke (moment arm) occurs at the mid-stroke of the piston sliding down and turning the crankshaft. If all of our fuel isn't combusted by then, the moment-arm or distance from the piston-center to the crankshaft quickly reduces to zero. Again, only vapors combust within a healthy 2 msecs (Fig-1), while fuel droplets take a relatively long time (>5 msecs) to vaporize before it can combust. Unfortunately nature is stubborn and vaporizes ~2/3 of our injected fuel droplets only during roughly the second half of the power stroke. So this huge amount of energy gets wasted because even though the forces of combustion are huge, its moment arm is rapidly approaching zero. Infinity times zero is still zero! Engine designers/engineers have been plagued by this phenomenon ever since the creation of the 4-stroke gasoline or Otto cycle engine. We need to improve this intermittent combustion/explosion process by combusting all of our injected fuel at the correct timing sequence. This is accomplished by injecting only vaporous fuel which will produce ~3X the power we now get. Another way to state this is, for the same power that we now get from a gasoline engine, if we burned the fuel correctly, we would only need 1/3 the fuel consumption to get 3X the current MPG.

Topic by RT-101   |  last reply

Repurposing a cell phone Li-Ion battery for a project?

I have a quick question. I made myself an electronic cigarette that runs off of AAA batteries. It works quite well, it has a heavier hit than those commercial e-cigs like Blu. The only problem is, probably because I keep smoking it like a regular cigarette, the batteries don't last long. There may be another underlying reason, but I'll deal with that later. I have three 3.7v Li-Ion batteries laying around that I used to use with my HTC G2. My question is: could I repurpose these batteries as a power source for my e-cig? I've seen some articles on repurposing them, but they don't exactly explain the method. Does it only require making the positive and negative contact as noted on the battery? So...out of four contacts, I'd only be using the two?

Topic by krisley   |  last reply

nPlayer Game Clock for Hexagonal Chess (Need Help Sourcing LCD and Misc Parts)

Hello, I am sourcing components for a project. There is a 3 player chess variant called hexagonal chess. I want to make a 3 player game timer. The idea is to have three displays, one for each player on their side of the board. Each display has a button to stop the timer and start the next. Because there are 3 players, it won't work well to have a single timer between them, as is done with a 2 player timer. I don't have much hardware experience but I can read/write C/C++ well enough. I will be developing under Linux. These are the components I am considering. FRDM-KL25Z arm m0+, needs some modification to activate real time clock. has usb control 4 digit, 7 segment display A basic LCD display - $6.86 each, can I find these cheaper elsewhere? Will the m0+ be capable of driving 3 of such displays simultaneously? Is there perhaps a more appropriate solution? What other bits am I missing? Like I said, I don't have much hardware experience. I know I need buttons...I've never hooked up an LCD before, is there anything special I need? I downloaded the manufacturer PDF for the particular unit (FE0202W). It doesn't give much info. It doesn't even say how much voltage it is rated for. Is this just such a basic component that it doesn't matter so much??? Kind Regards, Movo PS: All designs/code will be published under an opensource license.

Topic by tmckinney1   |  last reply

I need help creating a telephone network!

Hey! I was wondering if there's any clever people out there who can help me with my ambitious project. I'm doing some creative direction for an event and aim to create a telephone network within the venue. I want to put phones on tables and use the table numbers as the phone numbers... I also would like a way of recording everything thats said over the course of the night through the telephones? I have a very basic understanding of how these things work, I've made circuits before- but i am an artist, not an electrician so please be kind and explain to me like you would a child! I've got my hands on a load of old phones, so I just need to rewire them I guess?  Thanks!

Topic by kittyjrt   |  last reply

Hass and Associates - Å datasnoke er vondt lett : Enhver kan være deg!

Http:// Å ha tatt dagen av, var jeg på hjem lyd sovende. Telefonen ringte omkring 10am. Jeg har ikke brydd å plukke det opp. Det stanset å ringing og som jeg ble halv klar over at det ble mottatt av vår tjenestepike. Hva komplett tok meg ved overraskelse og laget meg springer mot full konsentrasjon var hennes samtale med den andre personen på ledningen. Dette er hva jeg hørte hennes ordspråk : «Det er ikke noen hjemme akkurat nå bortsett fra Chotay Sahib. Choti Bibi er i hennes rom sove. Baray Sahib forlot om morgenen å falle Chotay Miyan og har ikke kommet tilbake ennå». Jeg nærmet meg kvinnen mens dette fant sted og spurte som hun snakket med. Jeg ble fortalt at telefonabonnenten «lød som» en av mine søskenbarn, så hun fortalte ham disse tingene. Jeg tok mottakeren fra henne og murret en hilsen. Personen på den andre slutten legge på. Med skjelver ned min ryggrad, betraktet jeg som dette individet (med et uidentifiserbart antall) kunne ha vært. Det kunne ha vært noen – en markedsfører, en potensiell burglar, men en ting var for sikker ; denne personen var en «sosial ingeniør». Sosialt ingeniørarbeid er kunsten av bruken sosial mulighet å manipulere folk ved gjennomføreen visse tiltaks eller røpingseinformasjon som den er ikke toalett til. Det er en av de mest farlige formene av å datasnoke mens det ikke krever noen virkelige tekniske ferdigheter. Vi gjør all det på noe nivå i våre liv grunn forskjellige grunder. Når brukt av fagmenn imidlertid det blir et forskjellig ballspill alt i alt. I dette tilfellen ble de indre arbeidene av min husholdning utsatt mens noen leder vår tjenestepike inn i å troing at han var del av familien. Mest av hovedinnbruddene ved Kevin Mitnick, dubbet mens «de mest farlige datasnokene i verdenen» var gjennom sosialt ingeniørarbeid. Lar oss studerer et tilfelle.

Topic by lcotto1 

Montior to light Box

Hi everyone, Im after some help im trying to turn an old monitor which wasn't working (wasn't powering up) into a light box for art work, but im not sure what to do in terms of powering it. Ive still got the PCB but the one which send the power to the monitor (lights) has a connector that's broke off. Can anyone help? Cheers

Topic by drop_dead_fred   |  last reply

camcorder viewfinder pinout

I have recently come across a panasonic wv-vf01 crt viewfinder. i dont know the model camera it  was from, but i  Would like to drive it. i have already found video, i just need the voltage and pinouts. it has a 6 pin connector. and i plan on hooking the crt to my raspberry pi and show the time on it

Topic by devicemodder   |  last reply

Traffic signal input voltage help

I have recently bought this traffic arrow from a surplus store and i cannot find the input voltage anywhere on the net. it has a built in switch mode power supply from what i can tell and i think it is 120V AC but am not sure. the arrow is a GE Gelcore LED Traffic Signal. ANY help would be appreciated.  thanks

Topic by devicemodder 

[GUIDE] Raspberry Pi 3g Internet Wifi Access Point (Optional script to sniff login details)

Wasn't sure where to put this, thought it might be of interest to someone in here :) As a project, I set up my Raspberry Pi as a 3g internet Wireless AP to strip SSL from secure websites and harvest the login details. I wanted to show how easy it would be for someone to set up wireless AP providing free internet, with the equipment hidden - maybe in a backpack - and sit in a public place grabbing login details without anyone suspecting a thing. In the future I would like to do this while running the Pi from a battery bank. Guide to set up Raspberry Pi as a 3g Wireless AP Tutorial on writing BASH script to harvest login details

Topic by BigCowPi   |  last reply

Compatible external battery to my iPhone 5

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

Popular 2 pin power connector for PCBs?

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

How to make a own 5 X AA battery holder?

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

Circuitry for lighting

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

Any ideas on an in-ear white noise device to help stutterers/stammerers?

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 (, 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 ( - 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

Batch file-Change the target directory to wherever the file is?

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

Things to do with a broken flash drive

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

Powering a CD-ROM drive without a PC

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

Ziphius, the aquatic drone

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: 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 help me with schematics please?

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

Needed: a trick to debug a circuit on a breadboard - (The Spaghetti Incident)

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

How to convert a battery pack to AC power?

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

How to determine remaining hours/days for a AA battery source?

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

How to Break Solder Tabs On Ni-Cad Battery Pack

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

Wiring Staples Button to Xbox 360 power button

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:;categoryGroup=forums&amp;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