IBM model M has 5 keys that do not work. How can I clean those contacts in the membranes?

The keyboard is in excellent shape otherwise.  Can I puncture the bottom metal shell in the locations in trouble and then inject contact cleaner?  Are there some other vent holes that might be used?  Could it be an electonic problem or circuit board plating in those areas?  The five keys affected are : g,  h,    apostophe ,   up arow,  and the number pad zero. Thanks

Question by rogets   |  last reply



Dose anyone know how to make a emp generator? Answered

I have been looking for plans for a good emp (as in electromagnetic pulse) plans for months. I need it to be small, but effective. Also I would like it to create a field for a little while and not just a quick blast. Any  suggestions of where i could find plans for some thing like that?

Question by Tobor 2.0   |  last reply


DC P.M. motor help

Went to the scrapyard and pulled out the motor that runs a treadmill... thinking the treadmill plugs into the wall I thought the motor was going to be AC...WRONG, it a DC P.M. I want to build a home made disc sander and was wondering if it possible to make this motor run from the wall outlet? There was a small circuit board next to the motor but I didnt grab it since I had disconnected all the wires from it. BTW, Im completely clueless to electrical stuff so be gentle with me. Dask

Topic by dask13   |  last reply


Trouble with LM317?

Im having trouble in finding a heatsink for an LM317M chip and was looking for suggestions on where to find one that would be good for it. this is the datasheet for the chip...it should be the DCY Package (top view) http://www.ti.com/lit/ds/symlink/lm317m.pdf

Question by diabloboy   |  last reply


Are there any performance differences in lead-free solder and normal solder?

Well I might start making some BEAM bots but I am having some trouble deciding what solder i need to use for good safety and good performance. Thanks for you time. -redcorvette1

Question by redcorvette1   |  last reply


Can you help me with my mini E.M.P. generator design?

Hello everyone! I am currently planning on bulding a handheld E.M.P. generator (it's dangerous, I know, sorry) that is capable of killing a small devices (e.g. a small camera) at close range (<10cm). I got to the capacitor bank and wondered if 180J is enough for my needs? I also have some other questions (in no particular order): - What is the bare minimum to kill such devices? - Does it normally take 90 secs to charge a 90uF bank to 2kV (using a DC boost converter)? I have never designed a high voltage charging circuit before so I don't really know if I'm doing things right. - Is my capacitor configuration good enough or does it need tweaking (e.g. more voltage)? - How do I protect my circuitry from getting blasted by the coil? - Is a single pulse sufficient? - What kind of switch should I use for high voltage? - Should I use lithium-ion batteries for supplying power? - Should I make the frame of the device out of metal? - Should I be using a DC boost converter for charging capacitors? If not, suggestion? - Should my coil have a little or a lot of inductance? Again, I am fully aware this has "Darwin Award" written all over, sorry about that, but I think this is safer than guessing around. Thank you for reading this! Looking forward to your responds!

Topic by mr.derpinton   |  last reply


how do you make an EMP? Answered

How can you make a little EMP, only strong enough to disrupt (not destroy) electronics? i would be nice if re-usable, or pocket size.

Question by necropolian   |  last reply


how do i fix this minecraft bug? Answered

Theres been a bug going on in minecraft that is hard to fix.its a bug that,when you fly to much in creative, it glitches up and when you try to exit it keeps the cursor inside the box. its happened to me twice and when it does, you cant go to any other websites or anything. you cant type in anything and if you sign out of gmail (or any other mail site) it wont let you back on unless you type both the username and password. thanks for helping.                       nfk11

Question by nfk11   |  last reply




How can I open .mod files in linux (ubuntu)?

I am trying to open a .mod file in ubuntu. Every program that I have tried has failed right away. I have tried, vlc, real player 11, and everything that comes installed in ubuntu. Please help me get this file open. Thanks

Question by TOCO   |  last reply



I need help i´m new to arduino

Me and a friend of mine need to build a project for school and we had the idea of making a car with arduino, controlled by android with a live camera connected to a raspberry. I want to now if that is possible to do.

Topic by andrehnunes   |  last reply


can i increase wattage by the following way?

I think i can increase wattage by placing three coils in the following way / / / L m n among them 'L' as primary and m,n as secondary so that when electricity is passed through L magnetic lines of force from that coil induces current to 'm'.as electricity passes through 'm' it again sends magnetic lines of force inducing current in 'n'.so that connecting 'm' , 'n' in parallel or series will give me increased wattage

Question by lohithg   |  last reply


Can you help me with my mini E.M.P. generator design? Answered

Hello everyone! I am new here so tell me if I have broken any rules :) I am currently planning on bulding a handheld E.M.P. generator (it's dangerous, I know, sorry) that is capable of killing a small devices (e.g. a small camera) at close range (<10cm). I got to the capacitor bank and wondered if 180J is enough for my needs? I also have some other questions (in no particular order): - What is the bare minimum to kill such devices? - Does it normally take 90 secs to charge a 90uF bank to 2kV (using a DC boost converter)? I have never designed a high voltage charging circuit before so I don't really know if I'm doing things right. - Is my capacitor configuration good enough or does it need tweaking (e.g. more voltage)? - How do I protect my circuitry from getting blasted by the coil? - Is a single pulse sufficient? - What kind of switch should I use for high voltage? - Should I use lithium-ion batteries for supplying power? - Should I make the frame of the device out of metal? - Should I be using a DC boost converter for charging capacitors? If not, suggestion? - Should my coil have a little or a lot of inductance? Again, I am fully aware this has "Darwin Award" written all over, sorry about that, but I think this is safer than guessing around. Thank you for reading this! Looking forward to your responds!

Question by mr.derpinton   |  last reply



. Plot the magnitude of the couple M required to hold the system in equilibrium as a function of θ for 0 ≤ θ ≤ 2π

The magnitude of the force P applied to the piston of an engine system during one revolution of crank AB is shown in the figure below. Plot the magnitude of the couple M required to hold the system in equilibrium as a function of θ for 0 ≤ θ ≤ 2π.

Question by zineb88   |  last reply


I m trying to control Logic with miduino s proximity sensors but the midi input goes mad. Answered

 I m trying to control Logic with miduinos proximity sensors but when i connect with my mac with the miduino, the midi input goes mad with random numbers, I connected all the unused inputs on miduino with grnd but still.... any ideas?

Question by nikaki   |  last reply



Cree XL-M RGBW LED - recommended LED driver?

Hello I live in Australia and am new to the electronics world. I recently obtained a Cree XM-L RGBW LED 20mm 12W (image). I want to wire it up, so decided to browse the internet for wiring information. This has resulted in a multitude of questions and I haven't been able to find any answers.  From what I can gather, each LED runs @ 100% ~350 mA, up to a maximum of 1 A. Doing some research, it seems I should use an LED driver to ensure that a consistent voltage is maintained. I have some LM317T MOSFET/Voltage regulators coming in, but after some further reading, they can be inefficient. I read I can use an Arduino for PWM to help set different colours by varying the brightness of each LED. Can the Arduino also be used as a driver? Looking for a driver is where I'm stumped. I'm assuming I need a driver per LED. Does this mean I need 4 separate drivers or are 4 channel drivers available? I've seen some single-chip IC drivers and some larger (multiple component) drivers, which should I be looking for? I would have thought that drivers for this type of multiple LED would be easily found, but I'm stuck :) Maybe I'm searching for the wrong thing? I emailed Cree, but they simply gave me an email address for an Australian LED company that no longer exists (at least the domain is no longer active). So I thought the next best bet would be reaching out to users who may have dealt with these LEDs. Thanks!

Topic by hendrikse.alex   |  last reply


Land a helping hand m B.Tech. student want a help for project.. plz do it for me...?

I want to make a bike with more power so plz give me your own ideas.....

Question by    |  last reply


i m trying to make a hexacopter with arduino interfacing xbee.my question can that xbee copter be controlled by android?

I have a arduino,2 xbee,xbee shield,xbee adapter to connect it to pc or android

Question by enrichtarun   |  last reply


i m making rocket shoes. any idea which topics r required to study? had it been made earlier???

Hiii....has anyone yet made rocket shoes??? shoes, on wearing of which justly, u can fly.... i m trying to make one wid chemical or ion propulsion.....any idea or suggestion...??? my e mail id...rjsaxena24@gmail.com

Question by raj fighter   |  last reply


how to recover eye sight in 5 months ???i m myopic with -2.5..plz help.....

As i wnt to become a pilot.i want to get rid of these glasses but dont want my eyes ,be corrected by laser surgery..

Question by sarah iman   |  last reply


this is fake right? Answered

Https://www.instructables.com/id/Distill-Hydrogen-Peroxide/

Question by eric m   |  last reply


What are those pads for? Answered

Under the battery of my mobile phone (Nokia 5070) there are five PCB pads. Does anyone know what are they for? (testing, reprogramming the chip...?) May I use them to hack (or brick...) my phone? Thanks. Fabio M.

Question by Fabio M   |  last reply


laptop Keyboard problem - I can not make a capital m,j,k,i or < with left shift key.

I have an acer keyboard and the computer was opened to repair the speaker output. I did not do the repair and I wasn't present when it was done. Now several keys will not work with the left shift key. The m key does not work with either shift key. When I use the left shift key on with these keys nothing happens. The only way to make a capital m, is to use the caps lock key.  Do you have any suggestions on how to fix this. Buying a new computer is not an option. By the way, the original speaker repair sounded good for only one day. 

Question by artlife   |  last reply


How do you fix a Apple jail broken Ipad or ipod touch or Iphone?? Brian M Bernal

I would like to reset to factory settings does anyone know how for an iPhone iPod or itouch?   Brian M Bernal

Question by brianmbernal   |  last reply





Is there an equation to figure a set amount of PSI to a recognizable, or commonly used force measurement?

What is/is there an equation to figure the speed a projectile travels, based on the PSI or force applied? What would this force be? k/h | fps | m/h | m/min. | k/min.|

Question by PKTraceur   |  last reply


Electricity Transmitter and receiver. is there anything such as that.

Electricity Transmitter and receiver. is there anything such as that. simple though. when i press a button it transmits a signal and the receiver receives this signal and releases electricity. heres a little diagram: O------T             B-R-----M O=Button T=Transmitter R=Receiver B=Battery M=Button -=Wire  =Air? the receiver is powered by the battery

Question by pkataria1   |  last reply



help me in making power supply for my "Drill m/c (DC)?

I got a cordless drill machine. its battery pack is ruined. so now I want to make it corded one so that it work directly with my ac mains (240Vac). the power rating is 13.2V and 2amp(at constant operation, at starting current is very high >10amp). so I want a Dc power supply approx. 30W at 15V and 2Amp. help me in making this. give me the components required and circuit diagram(I want to use transformer). also I want to put this power supply in the battery pack box.

Question by tajeshwar28   |  last reply


how can i make a wireless switch to on of a dc motor.......i don't want any readymade remote ....can anyone help me out?

I know how radio and wireless technology works .....but i m lil.perplexed about the circuitry ....so plzzz answer the ques with reasoning and diagram with appropriate values of the components needed...[.just for the the reader knowledge i m new at wireless]

Question by arihant   |  last reply


salvage a radio?

I found an old portable sterio but the cd player and tape deck did not work but the radio did so i took the pc board out that has the radio guts on but now im lost  the wires coming out of it say s/m rch lch gnd +B Has anyone got a clue what thease mean  im guessing  rch and lch is right and left chanal for the speakers but the s/m and +b is throughing me

Question by nonamesleft   |  last reply


Dear friends i want to make a simple remote operated door can anybody help me, soon with circuit diagram? please help !

Friends i m using a simple IR pair , and want to usde 8051 micro controller with l293d  stepper motor ic. please frnds help i m not able to construct its circuit diagram. send me the circuit diagram .......please.

Question by dkb1990   |  last reply


How to make a IR transmitter and receiver for DC motor?

I want to make a IR transmitter and receiver for DC motor.

Question by RUDR   |  last reply


cryptography

Can anyone tell me about some innovate projects in  the field of computer Engg.(related to network or cryptography).i m a student of b.tech final year..

Topic by sonikagondval   |  last reply




How exactly did this happen in this c++ output window?

Well this is a pretty easy program i made while practicing, by mistake i entered "a", as the first element of my matrix and the whole program displayed results(i wasn't able to add other elements it directly displayed the results")  The code which i used: #include #include #include void read(int a[][10],int r,int c) {      for(int i=0;i      {              for(int j=0;j              {                      cin>>a[i][j];              }      } } void display(int a[][10], int x, int y)       {            cout<            for(int i=0; i                    {                         for(int j=0; j                                 cout<                         cout<                    }       } void displayt(int a[][10],int r,int c) {      for(int i=0;i              {                       for(int j=0;j                               cout<                       cout<              } } int main() {     int m,n;     int a[10][10],b[10][10];     cout<<"Enter the dimensions\n";     cin>>m>>n;     cout<<"Enter the first matrix\n";     read(a,m,n);     cout<<"entered matrix:\n";     display(a,m,n);     cout<<"Transpose:\n";     displayt(a,m,n);     getch();     return 0;     }

Question by ankur2893   |  last reply



What happened when we wrapped cooper wire on the magnet and pass current to the coil?

Is this increase power of magnet or not?

Question by Pankaj q   |  last reply


Is this an Microphone amplifier and how to make it by myself?

I don't want to spend 150 USD for this thing :), but I want to do it myself. 

Topic by sbaltov   |  last reply



Which is the best browser to write and publish instructables?

I´m asking this since I have had troubles with firefox

Question by Tazo   |  last reply


how to make a foldable for a order of operations math lesson?

I need to come up with activities and foldables for a math lesson and the subject is order of operations

Question by karynlucero   |  last reply