Half broken monitor

I recently bought a 19 inch LCD monitor for 40 bucks (used). It works perfectly for about half an hour (i havn't timed it) and then the screen just goes blank. If i turn it off and then back on it works for a couple of seconds then it turns back off. If I let it be for a while (like an hour or just when I'm not using my computer) it works fine for another half hour. Is this an overheating problem or what is going on?

Topic by guyfrom7up   |  last reply


Can I replace MOSFET with IGBT in Solid State Tesla Coil?

I have a half-bridge circuit. It using IRFP460. But I want turn this driver to high power version. So I request some help! Can I use IGBT for half-bridge circuit?

Question by james34602   |  last reply


Half Inch CRT Monitror

I was tearing apart an old VHS camera and decided to rip the LCD out of the viewfinder. Much to my suprise I find a CRT monitor not a LCD! This screen is about 1/2 inch. It has a 5 pin connector that leads to the motherboard and a chip on the bottom that says A118121. Obviously two of the conections would be V+ and ground, but what about the other three? I would like to turn this into a composite or VGA compatible screen (maybe even a crazy tiny oscilloscope) but I need some help. Any suggestions or leads would be greatly appreciated.

Topic by gimmelotsarobots   |  last reply


Operating a transformer at half the voltage? Answered

What could be the effects of the output when operating a transformer at half its rated voltage, specifically to the amperage? as two examples: If I had a transformer rated for an input of 240v and an output of 20A at 24v and I was to supply the primary with 120v, what would happen to the output? If I had a variac (autotransformer, variable transformer, ect.) and it was rated for an input of 240v with an output of 0-260v at 11A, what would happen to the output ratings at only 120v?

Question by pmk222   |  last reply


Half-Wave Rectifier Question?

Hello Everyone, Well, I built a half-wave rectifier using a diode and a resistor, but it doesn't seem to be working as I want. I'm thinking of adding a capacitor to help smooth out the wave, but my whole purpose was to produce a pulse of energy at 60Hz. Basically, to just chop off the lower half of the sine wave. For my diode I used a 1N5406 rated at 600V and 3 amps. The resistors are rated at 20 watts and the whole thing just plugs into the electric outlet. It seems to work ok, but when I take this rectified output and put it into a transformer to step it up to around 1000V thats when I have a problem. After its stepped up its supposed to charge a small capacitor from which the electricity (when built up) will jump across a small spark gap. The spark gap is adjusted correctly, but he capacitor doesn't seem to like to charge on this wave. Its rated 2KV so voltage isn't the problem. The problem is that it will fire once, but not repeat the cycle.  (The transformer shouldn't be the problem because I'm pulsing the dc) Any Ideas? Thanks

Question by transistorguy   |  last reply


PC half dead - not good

Machine will not POST - no beep, BIOS smart fan-control not engaging, PS2 keyboard has no power, monitor reads "no signal" Board does have power - things spin (like the CPU fan which shouldn't until it gets hot) Preceding clues(?) - I thought I'd developed tinnitus, but found it was the PSU (I think) making a high-pitched ringing noise, half the day unplugged and that seemed to go away. Display not engaging properly on start-up: If I waited until the machine got to Windows login and then switch the monitor on - no problem. Switching the monitor on before this point - black sort of standby mode. I think I might try the PSU first, then think about the mainboard. So far I've plugeed and re-plugged things, tried with 0,1 & 2 strips of RAM with no difference. Any suggestions welcome I spent a lot of time replacing 1 cap' in the PSU, then I replaced the PSU (logic being that if I've tampered with it an the thing still doesn't work I should replace it regardless) Then I bought a new board. I was a bloody-sod, CD/DVD still doesn't work... L

Topic by lemonie   |  last reply


gmod

When i get more than 10 gmod users il unleash gmod how to instructables like how to make a plane without hoverballs, how to make a podracer, how to make a thaad defence truck,how to make a combine helicopter fly, how to make a airboat fly, how to turn your buggy into a lawnmower with npcs, how to download addons,how to change settings, i will release these in groups of 3 to prevent short pointless instructables and mabye a collaberation so all us gmodders can share ideas... UPDATE: i have now started posting my gmod instructables! enjoy!

Topic by bedbugg2   |  last reply


How to Use a Single Half-Bridge Micro Load Cell for Weighing

Hello,Could anybody please tell me how to use a Single Half-Bridge Micro Load Cell along with an Hx711 module, Arduino Nano to make a weighing scale?I've attached the kind of load cell I'm using in the attachments.Thank you.

Question by akshaykkumar   |  last reply


How do I delete a half finished instructable? Answered

I started it but decided not to post it and want to delete from my profile, how can delete it.

Question by imthatguy1125   |  last reply


How much lift is created by a half-sized rotor?

If there is a rotor of 26ft rotating at 600 rpm and lifting 635kg of weight at 1200ft/min 14000ft so if there is rotor of 13ft HalfSized 26/2 =13 and same rpm 600 & same power so will it lift half of the weight like 635/2=318kg at 1200ft/min 14000ft ? if not then how much half sized rotor will lift at same rpm and power if 26ft rotor is lifting 635kg at 600rpm at 1200ft/min upto 14000ft then how much 13ft rotor will lift at same rpm and power at 1200ft/min upto 14000ft ? The helicopter used in this example https://en.wikipedia.org/wiki/Robinson_R22

Question by MuhammadK19   |  last reply


Half bridge in "A reliable plasma speaker doesn't work"?

Hi! I am a  student and I just started to make my first half-bridge plasma speaker, and I used the schemetic in https://www.instructables.com/id/A-reliable-plasma-speaker/ However, after I finished, it didn't work. I used an oscilloscope and I found the VGS of high side MOSFET was between -3 and -6, and the low side was between 12 and 0. Then I accidentally got it work, but the MOSFETs were very hot, and then they exploded. After I change the MOSFETS, it had the same problem as before again. But if I short the capacitors, the wave form for both the high and the low were correct. can anybody explain why? Thanks.

Question by carldong   |  last reply


Can I cut a piezo electric transducer in half and it still work?

Question sums it up for the most part.

Question by Nicknin10do   |  last reply


Hollow semi circle split into half that needs to open when pulled?

Hi - we need to build a semi circle shaped hollow object that is split in the half vertically. And we plan on sliding the 2 halves of the semicircle on tracks so we can open it to reveal something inside. Kinda like a semi-circle door.. any guidance pls on material we can use? The semi circle needs to be about 2 feet in diameter. Thx

Question by Meena Sivakumar   |  last reply


How could I make a rigid USB keyboard fold in half?

No one seems to manufacture a full size 104(?) key keyboard which folds (the way the first IBM Thinkpad's notebook board did) so as to fit in a backpack or notebook case. I do not like to type on those rubber roll up keyboards. Any ideas on how I could build a folding keyboard? Thanks

Topic by TAP119   |  last reply


Where do I get half inch plastic sheet for cheap? Answered

Hey, I have a CNC milling machine and I mill things mostly out of plastic. I'm just looking for a cheap place to get plastic sheet if anyone knows where I can get it. I need 1/2 inch. I am currently getting it on amazon for about $10 per square foot (including shipping). Here is the shop http://www.amazon.com/HDPE-Density-Polyethylene-Sheet-White/dp/B000ILJZNY/ref=sr_1_13?ie=UTF8&s;=industrial&qid;=1256085952&sr;=8-13 I really don't care what kind of plastic it is as long as it is cheaper and of comparable strength. Thanks

Question by galaxyman7   |  last reply


Microwave Oven Transformer arcs too small- about half a millimeter

I have two microwave oven transformers (MOTs) that I am currently working on, and I have taken one of them apart to make sure of the wiring of the coils. I am fairly confident in the wiring of the whole system. I have the original primary and secondary coils, both made of copper. The transformer is one of the larger ones I have seen, and its wattage at about 1000W. I know it is not popping the breaker because the hum is always on. I have read through many of the instructables out there about MOT's, so I understand it pretty thoroughly, but the arcs on the instructables I've seen are several inches long, and my arcs are about half a millimeter. I really wouldn't call it an arc at all.  I have the common wall output of 110 VAC, 60 Hz going into the primary coil, and the ground is attached to the MOT block itself. One of the secondary output wires is connected to a capacitor bank of 3 MOC's in series, and I have the other output on the end of a PVC pipe which I touch to the opposite end of the capacitor bank. What am I doing wrong? 

Question by Technicolor   |  last reply


peer to peer communication between Arduino Micros, serial? half-duplex?

Hello all, I have a few Arduino Micro units, and need to connect them together (in a mesh network) so that every unit in it is interchangeable, meaning that any unit may be in connection with more than one unit. As the Master/Slave form is out of question at this stage (because any given unit cannot be both Master and Slave at the same time, of course) I decided to go for a simple serial communication. However the Arduino Micro units (and frankly none of the Arduinos) do not have sufficient serial pins and I was advised to use Soft Serial instead. I was looking into the pin out of the Arduino Micro but cannot quite figure out which pins I can use for the serial comm.; I need 4 to 6 serial communications. If not Micro, what other Arduino (or any other solution) would you suggest? Each unit needs to have the following information ready at its serial ports: - its ID - its MAD - sensor value (analog or digital) Any help is much appreciated, as the nature of the problem may not be changed. So I need to solve it as it is. Karim.

Topic by karimskarim 


how do i make a custom spray in counter-strike and half-life?

I would like to add some custom sprays but i don't know how, i assume any method will work for similar games.

Question by d2j5   |  last reply


Full Wave and Half wave rectifier (220 Volts AC to 5Volts DC) ? Answered

Hello, I have to make a Full wave and half wave rectifiers which step down 220 volts~ AC to 5 volts DC.  I am pretty aware of the circuit diagrams , I would appreciate anyone helping me with the exact diodes and transformers i need and where i can get them.  Please do let me know about a SAFE circuitry 

Question by ParanoidAditya   |  last reply


In an AC SG Tesla coil circuit can the capacitor be half of what it should be?

AC SG Tesla coils usually have a HV AC transformer leading to a capacitor. The capacitor is usually tuned to the transformer so the spark gap will fire twice a cycle at every polarity change due to the 50-60Hz mains frequency.  Can you match up the transformer to capacitor so the spark gap will fire four times every cycle instead of two and will this still produce good results compared to the conventional method?

Question by The MadScientist 



how could I make a smaller solar heater to heat a half gallon of water?

It must be smaller than 55cm and be able to heat up a half gallon of water

Question by    |  last reply


i just cut my finger in half with a table saw 3 mins ago? Answered

Ouch. any suggestions? I have no fingernail WTF.   how do i get a missing finger badge? Since writing the above message, I went to the ER and got fixed up. My finger is numb, and my sentence structure has improved. A simple push stick could have saved me $700, and my finger. DO NOT EVER GET CONFORTABLE WITH A DANGEROUS MACHINE. You will always lose, It is only a matter of time. Have a safe november! -Nepheron

Question by nepheron   |  last reply


XBX 360 HL:2 & PRTL

On the xbox 360, can you get Half life weapons on portal? i've seen done on PC, and it looked interesting.

Topic by jrdur7277 


How can I cut in half a CRT's glass case without shrapnel or mercury poisoning?

 What I want to do is remove the phosphor screen of a CRT and see what happens if I hit it with intense UV light. I know I've got to look out for high voltage, and that if I don't let pressure into the vacuum very slowly with a small hole the glass will shatter and spray shrapnel everywhere.  I'm also concerned about mercury/lead and any dangerous chemicals I'll be exposing myself to.  Can someone explain the dangers and what I can do to avoid them?

Question by kramerr 


I need help identifying a half built server I found in an old storage unit?

We were recently cleaning through a storage unit. I came across what appears to be an old half-built (desktop) server. It is not completely built so I am looking to finish building it. It is custom built, so there are no stickers or modal numbers that I can see. It has 4x 1gb ram chips. Two hard drives (with room for three more), fans, processor, and dvd drive. I knew how to insert the ram chips but I don't know how to connect all the power cables inside. I'm hoping to find instructions some place. I could use some help. I have done some computer programming, so I know what the parts look like and function to some degree but not enough to put this together. I don't want to risk damaging it since it may be worth a lot more than a 10+year old pc. I don't think there is an operating system loaded, and I'm not sure how to go about that either. Any suggestions?  Although I can't find any stickers, there may be some other label located somewhere, but it wouldn't be too obvious. Any suggestions on where it might be located?

Question by www139   |  last reply


Why does my PICAXE 08m seem to be resetting itself half way through the program?

I am at the final stage of my automated chook door project, and have come across a problem which is proving a real headache. To begin explaning the problem first of all I must explain a bit about how it works. First of all a PICAXE 08M is used to control a linear actuator attached to a vertical sliding door. The PICAXE is fed an LDR (light reading) and based on this 'light level' is programmed to either raise or lower the door. Two relays are employed to operate the actuator in one direction and then to reverse it (that is turning ouput 1 on lowers the door, turning both output 1 & 2 on raises the door). Unfortunately I don't have any position sensors built in (something which I now realise I should have done), which means that I have to operate the door for a set period of time (meaning that the program assumes where the door is at). Anyway when it is day I want the door to raise in order to let the chooks out. First it checks through regular intervals (and I will extend these intervals when I know its operating correctly) whether it is a certain light condition, then a pause occurs aswell as another light check to ensure that it is acutally the right light level, ready to open the door. The same also occurs when the door closes HOWEVER there is a safety system fitted to the bottom of the door (an aluminum bar which is spring loaded and hangs bolow the physical door. It is hooked up to two microswitches in series which provides input to the PICAXE). It is designed to provide feedback to the PICAXE in regards to detecting an obstruction. Because this model of PICAXE 08M does not support the SETINT command, I cannot detect a obstruction while the program is paused for the duration of the doors travel to the closed position. This lead me to try and develop some code to beat the situation. ( By the way, when an obstruction is encountered the unit is programmed to raise the door for the equivalent of 4 loops worth of door travel, and then return to the closing sub to continue closing the door. If 5 or more obstructions are encountered the program ends requiring the user to remove te obstruction and reset the unit.) As seen in the code, I broke the time required to close the door into 250 ms intervals, and then created a for loop which performs each interval seperately. I did this so that within each loop (and therefore within each 250 ms interval) I could conduct a check to see if an obstruction had occurred before a certain loop number (NOTE I'm using Normally Closed microswitches: If input3 = 0 and Position < 83 then). The reason I have to test that the obstruction is within a certain loop number is so that the program will only accept an obstruction input while the safety bar has not reached the door frame - otherwise the PICAXE will think the bottom of the door frame is an obstruction and will continually raise and lower until the program ends after 5 obstructions - when in fact there were none! In theory and using the BASIC program simulator, my program works fine, however in reality it doesn't! The door raises fine and lowers to the closed position as desired (only when there were no obstructions! - in other words the safety microswitches were never activated). Unfortunately as soon as I introduce an obstrucion when the door is closing, it raises correctly and begins traveling to the closed position as I would hope. However when the door reaches the bottom it begins a continous cycle of raising and lowering (as would be valid if it were an actual obstruction). It has baffeled me for almost 2 days now, and the way that its behaving seems as if it reseting itself somehow. I am thinking this as I know that the program continues to raise and lower the door even after 5 obstructions (which would work if it was reseting as the obstruction variable would be reset to 0 everytime) have occured. If this part was at least working it would kill itself after 5 obstructions, however it just keeps going. To me it seems that when there is an obstruction and it reverses the door, a reset occurs, beginning the full door closing process. But because the door has already lowered a little the program then beleives that the bottom of the door frame is an obstruction and hence is in an evil loop of door raising and lowering. Can anybody please offer some adivce on my problem? I have tried replacing the PICAXE chip but the same problem occurs. The underlying issue I think sits at the level of trying to match the physical door location with the virtual location, based on time. HELP would be greatly appreciated! CODE: 'NOTE: Not all comments may be correct Load: symbol RELAY1 = 1     'Initialise Relay1 to output 1 symbol RELAY2 = 2     'Initialise Relay2 to output 2 symbol SETIME = 26500 'Initialise the SETIME variable to 26.5 seconds symbol LIGHT = b0     'Initialise current LIGHT variable symbol DAY = b1       'Initialise DAY light variable symbol NIGHT = b2     'Initialise NIGHT light variable symbol POSITION = b4   'Initialise counter variable symbol STARTPOS = b3 symbol OBSCOUNTER = b5' DAY = 100    ' Set Day threshold equal to 100 NIGHT = 30   ' Set NIGHT light threshold equal to 30 CheckLight: '**************Check Light**************** Readadc 4, LIGHT       'Read in input4 (LDR) and store in LIGHT variable If LIGHT > DAY then    'Check if current light level is > than the day light threshold   Goto CheckDayAgain   'If condition is true go to the CheckDayAgain sub Endif If LIGHT < NIGHT then  'Check if current LIGHT level is less than the NIGHT light threshold   Goto CheckNightAgain 'If condition is true goto the CheckNightAgain sub End if 'Pause 60000           'Pause 10 seconds Goto CheckLight        'Recheck light level CheckDayAgain:'*********Check Day Light Again********* 'Pause 10000 Readadc 4, LIGHT       'Read in input4 (LDR) and store in LIGHT variable If LIGHT > DAY then    'Check again if current light level is > than the day light threshold    If input3 = 0  then     'Check if switches are open indicating door is closed (as micro switches are normally closed)       Goto OpenDoor    'If Light > day light threshold and door is closed, then go to OpenDoor sub    End if End if Goto CheckLight        'If either of the above conditions are not true, then return to CheckLight sub CheckNightAgain:'*******Check Night Light Again******* Pause 1000 Readadc 4, LIGHT       'Read in input4 (LDR) and store in LIGHT variable If LIGHT < NIGHT then  'Check if LIGHT is < than the night light threshold   If input3 = 1  then  'Check if switches are closed indicating door is open (as micro switches are normally closed)       Goto CloseDoor   'If Light < day light threshold and door is open, then go to CloseDoor sub   End if End if Goto CheckLight        'If either of the above conditions are not true, then return to CheckLight sub OpenDoor:'***************Open Door******************* High RELAY1            'Switch on relay 1 or output 1 High RELAY2            'Switch on relay 2 or output 2 Pause SETIME           'Pause 26.5 seconds to allow door to rise Low RELAY1            'Switch off relay 1 or output 1 Low RELAY2             'Switch off relay 2 or output 2 Goto CheckLight        'After opening door go back to CheckLight sub CloseDoor:'**************Close Door****************** High RELAY1                 'Switch on RElAY1 to close door For POSITION = STARTPOS to 93         'Enter a for loop representing the time needed to close the door   PAUSE 250                'Pause 250 milliseconds for each loop   If input3 = 0 and POSITION < 83 then'If switches are closed and safety bar has not reached the bottom then an obstruction has occured     Pause 10                'Pause 10 milliseconds to allow for switch bounce     If input3 = 0 then                'Check if switches are still closed      Gosub Obstruction      'Go to obstruction sub when switches are closed and door is not fully closed     End if   End if Next Low RELAY1                 'Switch off relay 1 or output 1 STARTPOS = 0 Goto CheckLight          'After closing door go back to CheckLight sub Obstruction: OBSCOUNTER = OBSCOUNTER + 1 'Add 1 to the obstruction counter High RELAY2                 'Activate second relay to reverse door Pause 1130                  'Pause 1010 ms. The extra 10 ms is to account for the swith bounce delay Low RELAY2                  'Deactivate seconds relay to allow door to continue travelling down If OBSCOUNTER > 4 then      'if there are 5 or more obstructions then shutdown unit. Goto Shutdown End if If POSITION > 4 then        'Prevents a negative POSITION STARTPOS = POSITION - 5     'Minus 5 is to account for the fact that program returns to the next statement before executing another loop. End if Return                      'Return back to the loop to try finish closing the door Shutdown:                   'This sub raises the door slighty before killing the program. The user is required to clear the obstruction and reset the unit. High RELAY2 Pause 1000 Low RELAY2 Low RELAY1 End

Question by Mattdog123   |  last reply


Is there an inbuilt voltage doubler/tripler in Modern half-wave DC DST flyback or just a inbuilt diode?

Hi, I have dc half wave modern type DST flyback from a   computer  CRT and put out around 30kv. I wonder: Is there an inbuilt voltage doubler/tripler in  these modern half-wave DC DST flyback or just a inbuilt diode?  I became every confused from very contradiction   info.   Why I ask? I want to know as well as I would want to build a multiplier for the flyback.   I know mine isn't the old AC type but the DST should be a DC  pulsed ...The  flyback I have just  looks like these typoical modern DST ones here: http://www.imagebam.com/image/b88cbf268367234 . Your help would be tremendously relieving for me. I have been struggling to  find out  for a while now...  Thanks a lot

Question by leviterande   |  last reply


Led strip section not working?

I got a Led strip and a section of it doesnt light up blue but it lights up green and red. Also any variant that requires blue for a colour shows as that variant, EG Cyan on the one half but green on the side that does not show blue and another example, Purple on the one half but red on the side that doesnt show blue. HELP!

Question by TallinW   |  last reply


Battery Charging? Answered

If i charge a battery when it's half full will ruin the battery life between charges?

Question by KnexFreak360   |  last reply


help code problems i want to pause each word after is scrolls in for about half a sec or so

I believe this is the section of code that needs to be altered? // Plot each character of the message one column at a time, updated the display, shift bitmap left. void AlphabetSoup1() {   char msg[] = "  Enjoy the Vittles  ";   for (int charIndex=0; charIndex < (sizeof(msg)-1); charIndex++)   {     int alphabetIndex = msg[charIndex] - ' ';     if (alphabetIndex < 0) alphabetIndex=0;         //-- Draw one character of the message --     // Each character is only 5 columns wide, but I loop two more times to create 2 pixel space betwen characters     for (int col = 0; col < 6; col++)     {       for (int row = 0; row < 8; row++)       {         // Set the pixel to what the alphabet say for columns 0 thru 4, but always leave columns 5 and 6 blank.         bool isOn = 0;         if (col<5) isOn = bitRead( alphabets[alphabetIndex][col], 7-row ) == 1;         Plot( numCols-1, row, isOn); // We ALWAYS draw on the rightmost column, the shift loop below will scroll it leftward.       }            //-- The more times you repeat this loop, the slower we would scroll --       for (int refreshCount=0; refreshCount < 10; refreshCount++)         RefreshDisplay();       //-- Shift the bitmap one column to left --       for (int row=0; row<8; row++)       {         for (int zone=0; zone < numZones; zone++)         {           // This right shift would show as a left scroll on display because leftmost column is represented by least significant bit of the byte.           bitmap[row][zone] = bitmap[row][zone] >> 1;                     // Roll over lowest bit from the next zone as highest bit of this zone.           if (zone < maxZoneIndex) bitWrite(bitmap[row][zone], 4, bitRead(bitmap[row][zone+1],0));                   }       }     }   } }

Question by bdexter   |  last reply


Should I buy a breadboard? Answered

Half the stuff i make fails so should I buy one? And want are the benefits?

Question by TNEN   |  last reply


Crystal radio help anyone?

(If you want the blow-by-blow of my questions, skip the following gigantic piece of text and proceed to the 2nd list after the first)   I was reconsidering making a crystal radio the past week and so I set out to research the topic on the 2nd most popular information database on the internet which comes out of the 1st most popular one. According to wikipedia, all you need is one diode in order to split the AC signal coming in via the antenna in half, therefore it uses half-wave rectification (it's not quoted; it's what I understand from it). Could full-wave rectification be also used? Like connecting the antenna to a bridge rectifier (aka. diode bridge, aka. 4 diodes stuck together)? I know that half-wave rectification yields pulsed DC, but I also don't understand how. By that I mean what happens to the other half? Does the other half of the wave connect directly to the output? One last thing, I know the largest metallic object I can ever use as an antenna is basically just my roof, but then I don't like coming up to the roof and looking for some exposed metal to connect to. Any thoughts on what huge, metallic items I can use in my household? I've already thought up a list of what I could use for an antenna: -Window screens -Extremely long piece of wire (I have an 8 meter long CAT5 cable going from the 1st to the 2nd floor) -My front gate -Sheet metal laying outside my front door (not the gate) Here is the summary of all my questions: -Is this wikipedia article true? (see at the list "semiconductor" area) -Can full-wave rectification be used on such radios? -In the case of half-wave rectification, where does the other half of the signal go? -What can I use as an antenna (excluding my roof)? Aside from the asked questions: -Is there any other way to tune to a particular frequency? -I'm asking opinions to people who know what they're doing (no offense to beehard44, this is more of a poll that anything else).

Question by nutsandbolts_64   |  last reply


How do you make a kodak tazer with less zap?

I've read a few of the kodak tazer instructables, but none of them tell you how to suppress the voltage output (other than putting in a half-dead battery). But is there any way to suppress the zap? Cut it in half maybe? My history teacher is always wishing that tazer's were legal in school's, but this also looks very interesting, I wouldn't mind using it as a prank, but again, with less umff...

Question by Insect   |  last reply


What can I do with all this sulfuric acid?

I have a half gallon sitting around. Anything neat I can do with it?

Question by iPodGuy   |  last reply


how to make a ride out of scarp wood?

Oh and ment by scarp wood by wood thats like left over and turn it to a thirl ride by the the use par say drills a few nuts and bolts a hammer and some nails the reason why i ask because i do like to play around wih a few and tend to make stuff like a rocket which got way out of my hands a blasted half way to orbit and crash landed the half way to orbit thing is just a saying.

Question by neivadan   |  last reply


Where to get buttons like camera shutter buttons?

Where can I get buttons like shutter release buttons? Half press, then full press.

Topic by DELETED_bertwert   |  last reply


how to eject tape on canon camcorder zr65?

Canon zr65 mini dv camcorder won't eject. Tape cassette come out half way then stops, and goes back in. 

Question by milesartist   |  last reply


i converted a 230v ac supply to 12v using transformer and using half wave rectifier i converted ac to dc. Answered

The output waveform is as shown in fig. (in my book). When i connected a LED it glows continuously. But if u analyse the output waveform the current varies continuously. i expected the LED to flicker continuously. but its not happening so. can u explain me why?

Question by b_vignesh   |  last reply


I've built a few disposable camera strobes, and want to use them in solar garden lights, instead of LEDs. Answered

 My problem is getting them to switch ON after dark.  The strobes draw about a half an amp, when the first start to charge.  A single AA rechargeable battery should last a few hours, but no idea on how do the switching with only 1.2 volts.  Any help or suggestions?  Was hoping to get a half dozen put together before Halloween, sort of a lightning-effect.?

Question by HarveyH44   |  last reply


How do I fix a dell 50" plasma tv with no picture or sound?

I have power to the power board but no power to half the board from the transformers over.

Question by morse007   |  last reply


HP Laptop Keys Not Working?

I recently bought a HP Pavilion dv7-6c27cl laptop and half of the keys on the keyboard don't work or are very unresponsive                            Any help would be greatly appreciated.                                                       Thank You

Question by gibsoncrazed14   |  last reply


Question from a Solid State Tesla Coil?

I have a PLL SSTC. I use IRFP460 Half-bridge. Can I use other MOSFET?. Or how to choose a MOSFET for SSTC

Question by james34602   |  last reply


how to find what causes a LED strip ws2812 to work partially ?

HI All, i having trouble with my ambient light project. though it worked fine for a few weeks, all of a sudden less than half of the strip (the closer to PSU half) has been act strange and than stop to work. the rest of the strip work fine and still responsive. how do i discover which led is the culprit? is it possible that only part of the strip burnt or only one led? any suggestions for a quick test without ruin the led configuration on TV assembly. thanks in advance

Question by TalT3   |  last reply


site only displays raw code? help from instructables staff

Half the site just displays raw code for me and i cant post on bug forum cause i can make an account

Question by firezone   |  last reply


water inline low pressure gauge at output

I don't know if they sell them , water Inline  pressure Gauge  made for 5 lbs and under, or is there an easy way t to make one, doesn't have to be inliine, it just needs to  measure the psi at 5 gallons and at 1 gallon.. Even A balloon that burst at 3psi would be good/. it is for a medical device. i spent the last year going crazy cause it was defective brand new.  it was putting out the correct  pressure at the start, 5 gallons, at the half way point it was putting out about half the pressure, didn't know it, almost had  surgery because of the poor results thanks for any ideas

Topic by escapefromyonkers   |  last reply


RFID antenna question. Answered

How sensitive is RFID functionality to the length of its antenna? Specifically, if I had an RFID like this one, cut the antenna and then resoldered it, would the loss in antenna length (I'm guessing about half an inch) affect the workings of the device?

Question by Kiteman   |  last reply


How do you tap into a series battery pack to have the full series voltage AND half pack voltage from 2 parallel taps? Answered

I have a 320V lithium battery pack (100 x 3.2V in series) that I need to tap 160V from to run a couple of heating elements with. The main 320V is needed to run a motor. I was hoping to have the 160V taps in parallel (50 x 3.2V in series x 2 in parallel) to keep the pack at a uniform discharge level while still being able to run the motor at full voltage and at the same time. Is this even possible?  Is there an inexpensive way to do it?

Question by Nashty   |  last reply


how can you make a inverter that input 5v dc and output is 12v dc? Answered

I'm making a usb fan but it need more voltage to the fan 12v im only getting about half from the usb.

Question by s4sutler100   |  last reply


MP3 Battery won't charge?

I have just bought a generic MP 3/4 and did not fully charge the battery before exploring it's apps. Now I have a half full battery that won't charge any further. Can anyone help?

Question by willywombat   |  last reply