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Title in Primary Images

Dear Instructables Authors, Does anyone find the current trend of putting the title of an ible in the primary image as visually offending as I do? The format of the site puts the title right below the image in a concise and legible manner that doesn't interfere with the image of the project. Why clutter your image with unnecessary (often poorly chosen) typography? Please stop. Sincerely, Aesthetically Repulsed

Topic by Brooklyntonia    |  last reply


Swapping primary drive? Answered

I have laptop with a dying seagate drive, and before it dies completely, I got a hitachi drive as a replacement. My question is, how can I copy the disk exactly onto the new drive, keeping all files and programs intact so I don't have to re-install windows. I'm guessing I can't just copy and pasts, but maybe using xcopy? I have plenty of other computers and cables to use for transferring if needed.

Question by andy70707    |  last reply


transformer help needed

Hi guys, i'm a newbie on here so i would like to take this opportunity to say hello :) i have a salvaged transformer that i'm working on at the mo. It is the primary that is blown, but the secondary is fine. I am in the uk, so it is designed to run on 240. Because i am looking to produce high amps, one solution would be to use the secondary as a primary, otherwise i am looking at doing a full rewind. i'm kinda new to transformers, but have enough knowledge for the job in hand. my question is how many turns does the primary need to have? i know that you cant give me an exact figure without the dimensions of the transformer in question (700w microwave transformer if that helps) but i seem to remember from school physics that there is an equation to work out the number of turns a primary must have at a given voltage, i have googled for days to no avail, i'm guessing it is out there somewhere, but i cant find it :( and the last question is that if the transformer was to have too few turns on the primary, what would happen when it was plugged in? my guess would be that it would short out the mains and the coil would rupture, possibly tripping the circuit breaker? many thanks to anyone who replies :) and merry xmas to all :) 

Topic by jbaz73    |  last reply



Question regarding colour

Hi everyone! So here is another confusion in my mind.  I know that colours are a result of electromagnetic radiation in the visible spectrum interacting with our eyes.  The visible spectrum consists of 7 colours, abbreviated VIBGYOR. Now my question is, what are primary colours and secondary colours? And how come mixing of two colours produce an entirely different  colour? I expected that all 7 of them would be primary. But that is not the case.  Also, for illustrating the real world scenario from which this doubt crawled into my mind, consider that i have two pieces of translucent films, one blue, and other yellow. Now initially i place the blue film in-front of a white bulb, then it filters all other colours other than blue. Now place a yellow in-front of the blue, and there, you have green. What is the working principle behind this? How come the "blue" light turned "green" after passing through the yellow film?

Topic by charmquark    |  last reply


Can you insulate the primary coil of a Tesla coil?

Hello,    I am trying to build a tesla coil using a new design relating to a thesis paper I am working on. Due to spacial restraints my primary coil will be close to the secondary coil. I know I have seen others use insulated braided copper wire as their primary. I want to stay with 1/4" copper tubing if at all possible so I wanted to ask what affects it would have if I used heat shrink tubing on the copper tubing. I am aware the higher frequency voltage runs along the skin of the tubing since that is least resistive at that point. A for the power and caps I am using the following: three NSTs of which two are 15kv @ 30 miliamps and one 12kv @ 30 miliamps, 13 CD 2000VDC @ .15nf caps on each 15kv NST and 10 of the same caps on the 12kv NST. The spark gap is static for now.  I want to prevent arching as much as possible in the small space. Any advice is greatly appreciated. Some of the information relating to the thesis paper I cannot release due to a serious concern of being scooped before publication.  Thank you. :)

Topic by XsFacade    |  last reply


Quantitative Measure of Attempts to Influence Vote in Ohio

A good friend, who lives in Ohio, sent me this about various attempts to influence his voting in the democratic primary: So despite being towards the end of the calendar, Ohio is once again at the forefront of presidential election silliness. I submit for your consideration the number of attempts to influence our household vote via various means: calls by volunteers(a): obama 2, hillary 0 robocalls: obama 1, hillary 4 door-to-door visits by volunteers: obama 2, hillary 0 negative attack mailings sent by candidate: obama 1, hillary 3 unprompted invocations of candidate's name by one's toddler(b): obama 1, hillary 0 (a) Possibly but unlikely paid operatives (b) "Barack! Obama! Barack! Obama! Barack! Obama! Barack! Obama!" counts as only 1 invocation.

Topic by ewilhelm    |  last reply


what is the best primary pistol ?

For a knex war thats not oddammo

Question by Im_the_knex_god_hail_me    |  last reply


Change a project's primary photo?

About the last step before publishing a project is to pick the main photo you want used with the project.  Is there a way to change that photo later?

Topic by walter.warren1    |  last reply


Favourite Primary and Side-arm (K'nex)

If you could only make 1 primary and 1 side arm to take on your stupid little brother in a K'nex war, what would they be? Personally, I would take Dsman's DD-27, and Dsman's side-arm.

Topic by Trauts    |  last reply


Primary and Secondary on a usb external drive?

I've got a external usb drive connector, and it only has a short yellow ide connector, what would happen if I connected a regular ide cable to the pins, would I be able to connect two drives? IE: 2 dvd burners?

Topic by Punkguyta    |  last reply


LCD Monitor flashes primary colors

I have a nice 22" LCD monitor here, its a SCEPTRE X22WG-1080P, the monitor originally wouldn't get any signal at all. After opening it up & blowing it out, reseating all connections the monitor will turn on now, but it simply won't respond to anything. It flashes white, red, blue, green, black, etc in a repeating fashion. Anyone have a clue to what the problem is & maybe an instructable to fix it? Thanks!

Topic by zefyx    |  last reply


What is your favorite primary weapon to use in a knex war?

I don't care if it is a sniper, crossbow, shotgun, assault rifle, or whatever... If you also go onto knexinnovation.net feel free to use examples from there.

Question by travw    |  last reply


120V MOT transformer on 220V for spot welding machine? Answered

Hello i'm making a Spot welding Machine using a microwave transformer i'm removing the secondery coil to replace with 2 rounds of very thick wire for the output . the only problem is the transformer rated for 120V input Will it matter if i connect the primary to 220v ? i'm replacing the secondery anyway ?

Question by pixema    |  last reply



How do I use two mouses: one with primary button on left and the other with primary on right? Answered

I want to set up a second mouse with the primary button on the right. while keeping the primary button on the first mouse on the left.When I change it in windows (using Win 7) it changed the primary button on both mouses.I want each mouse with separate primary buttons.Does anyone know any program on how to do this?  

Question by Gcat5    |  last reply


Can I driver a transformer in multi primary coil? Answered

I have my flyback transformer. I use a CFL ballast to test the primary coil pinout I found (Pin 1,Pin 2) , (Pin 1,Pin 3) , (Pin 1,Pin 4) is the primary coil pinout Can I drive it with multi primary coil to get maxium voltage of it

Question by james34602    |  last reply


How do I determine the primary turns needed for this PLL solid state Tesla coil? Answered

I have nearly completed my SSTC but I am unsure how many primary turns are needed, is it just an educated guess, or is it calculated? There are no specifics on this on the website http://uzzors2k.4hv.org/index.php?page=pllsstc1.

Question by The MadScientist    |  last reply


I need a good airsoft primary, preferably automatic.

I have a few airsoft guns, a Swiss Arms sniper rifle that fires at 435 FPS, a crappy Crosman Pulse R70 that fires at around 115 FPS, and has a fried battery, and a UK Arms M4 carbine M- series that fires at 350 FPS, and I'm looking for another AEG with a good range, has good size for close quarters combat, fires at at least 350 FPS, and is in the price range of 100 to 150 dollars 

Question by Nerfgenius    |  last reply



How do I determine how to best couple the primary coil of a Tesla Coil to the secondary coil?

I need to know what the best dimensions for the primary coil would be for this secondary: 505 mm length 0.72 mm wire thickness (21 gauge magnet wire) and 60.325 mm diameter I would appreciate some sort of formula where i can just substitute the primary voltage and get a measurement but if that is not possible use 27 volts for the primary voltage. If you have suggestions as to other aspects of the coil i could improve, i would be happy to listen. It is a solid state coil and i will probably put a capacitor in series with the primary to make it doubly resonant.

Question by UbuntuNinja    |  last reply


Question about a flyback's polarity Answered

Hello, I am confused with this flyback transformer I have. I have a pulsed DC input on the primary coil (pulses from 0 to 15V) and that creates high voltage in the secondary coil. When I connect that input in the opposite direction (wrong polarity) I don't get high voltage any more. The possible explanation for this is that the primary coil has a diode in series with it. Now, I'm confused by this because I tested if there actually Was a diode in there (by connecting a DC supply and a DC motor, in series with the coil) and the motor always works! (also tested with a halogen light) I put the coil in series with the motor to test if there is a diode inside. If there would be one inside, the motor should not work in one of the two cases, when I switch the pins of the primary coil. So, as the results of the test tell me: there is no diode in series with the primary coil. could it be possible that there is a diode in parallel with the primary coil? If that's not possible, how come the flyback is not working when I connect the polarity incorrectly? Could someone please help me out with this? Thanks, Electorials

Question by DELETED_Electorials    |  last reply


Determining the amperage output of transformers?

I have two giant audio transformers that put out about 70 volts each. I want to determine what the maximum amount of current they can supply is, because they're really nice transformers, and I wouldn't want to break them by over-heating them. Is there any way to do this mathmatically? I have a multimeter that can measure ohms and voltage, but it can't measure watts, and the fuses for the ammeter are blown, and I can't replace them right now. Bear in mind that this is about as much as I know about the transformers, other than they're heavy, and that primaries are 120 volts each.

Question by tylervitale  


can you use 6 awg insulated wire for the primary coil of a tesla coil? Answered

Its a multi strand wire, not the solid type.

Question by DELETED_DELETED_kruser495    |  last reply


What are some good primary weapons, side arms, and grenades that use few special pieces?

What are some good primary weapons, side arms, and grenades that use few special pieces? I know there are many guns that I want to build, but I have to stop in the middle and I realize I waste over an hour (or more) building a gun I can't finish or use. Almost always it is for the same reason...I don't have many special pieces. By special pieces I mean: Y-connectors, Hinges, Bendy Rods, Ball Sockets, etc. I only have 6 Y-connectors, and thats the most amount of special pieces I own. I really would like it if some people could post links to guns that I could build over spring break. When you post it, could you please tell me these things (if you can that is!): The name of the gun, whether it is a pistol, rifle, sniper, grenade, etc, If it has any special pieces (It can have 6 Y-connectors at the most I don't have any other specials), what you would rate it on a scale of 1-10, or anything else you want to include to help me decide which one to build. Again any help or guns would be greatly appreciated, and would help a beginner k'nex gunner get more building experience!

Topic by tron1o7    |  last reply


How to find out the feedback coil and primary coil pins on a flyback transformer? Answered

I have an old one and a newer one. And where is the hv negative?

Question by theVader75    |  last reply


hi?

How to  id primary pin

Question by danydady    |  last reply


Tesla coil, secondary?

What kind of multimeter would measure the output in volts and the frequency of my secondary. It totalling in height is 22.7inch with a 3.5168inch diameter. Primary applied voltage 13.66kv with a distance of .5in between primary coil and secondary

Question by wiccakingkamui    |  last reply


Does it matter how a coil is wound? Answered

Hi everyone, Take a look at the illustration attached.  Is there any real difference in values between the four winding types? *** Assuming same core, same wire gauge and same number of windings on all 4 primaries, and all 4 secondaries *** A) Both primary and secondary are wound TOGETHER. B) primary is wound first, then secondary wound ON TOP. C) Primary and secondary are wound at OPPOSITE SIDES of the core . D) Primary and secondary are wound next to each other on the SAME SIDE of the core. Note that figure in D it seems like the wires are thinner, but I assure you, that's an optical illusion, and the gauge is the same in all 4 figures :-p Again, the question is whether the 4 coils would act the same in a circuit, or is there a difference in values between them? Thanks!

Question by Morgantao    |  last reply


Why do primary coils differ in shape and location between different Tesla Coils? Answered

I've been researching Tesla Coils, and one thing in particular strikes me, no one seems to agree on a shape and placement for the primary coil. I've seen reverse cone, cylinder, perpendicular spiral, and just wrapped haphazard. You can see which coil is primary in the following images, as well as examples of different styles of wrapping for the coils.  I've also seen the primary coil placed at the base of the secondary, as well as in the center of the secondary. I've gathered the following information in my research (I'm pretty sure everything is correct): The primary coils, through induction, transfers the charge to the secondary coils. The primary coils are much thicker to allow for the large amounts of current running through them. For maximum induction, you want the same amount of surface area for primary and secondary coils (I've seen this written in different ways at different places).  (You don't not want Maximum Induction see: steveastrouk's comment below) Primary coils are placed in a way to allow for....... (this is where things start to fall off and the reason for my question). So, if your goal is to have the most charge transfered from one coil to another, why are there so many different styles? Does one style benefit over another? Is there a logical reason one would opt for one one style rather then another? Thank you. Image Credits: Image 1: parts information Image 2 & 3: cylinder and cylinder centered Image 4: wrapped haphazard Image 5: reverse cone Image 6: not sure Image 7: perpendicular spiral

Question by StumpChunkman    |  last reply


wich is input and wich is out put? Answered

On a hand wound transformer for a joule thif wich is the input and wich is the output primary in? secoundary out?, also does it matter if the thick wire (primary) is on the bottom with the thinner (secoundary) is on the top?

Question by bushman9    |  last reply


Conical coil inductance calculation? Answered

Does anyone know a reliable calculation or online calculator for conical coil inductance? I am calculating this for a Tesla coil primary if anyone knows is a conical coil primary suitable for a 2000W system?

Question by The MadScientist    |  last reply


I am trying to figure the new wattage? Answered

Hello, I built the ark welder from this instructable found athttps://www.instructables.com/id/Build-a-Microwave-Transformer-Homemade-Welder/ I'm trying to figure the new wattage I have two transformers 1: 650 watt MOT-primary at 120 volts 60 Hz 5.41 amps secondary at 16.5 volts 39.36amps 2: 600 watt MOT primary @ 120v  60Hz  5 amps secondary @ 16.5 volts 36 amps the primaries are wired in parallel in the secondaries are in series. The secondaries test at 33 V and I'm guessing roughly 76 amps. I want to calculate the wattage. Is the wattage calculator from the voltage on the primaries (120+120)*76 or calculated from the voltage on the secondaries (16.5+16.5)*76 or am I a complete moron? Also the primaries are parallel are they both 120 V or are they 60 V each thanks in advance.

Question by deadlift1979    |  last reply


Multimeter inductance meter? Answered

I am building a Tesla coil with a fairly poor primary coil. The primary coil is a conical 12.5mH (theoretically) but when I measured it with my multimeter the inductance kept jumping and was only doing so within the range of .05mH - 2mH why is this can it not measure conical coils?

Question by The MadScientist    |  last reply


Unable to change image when clicking on a thumb... Answered

When viewing an article,which has multiple pictures with the row of thumbs below the primary image, I am unable to get the primary image to change when I click on a thumbnail, it only works in IE, but not Firefox ..  Why ?? Can't even post this question using Firefox - booo

Question by bytes2go    |  last reply


Resonating my tesla coil? Answered

I have heard a little about resonating a tesla coil and wan't to make sure that it is going to before I spend money for my primary (copper is expensive).  My secondary has about 1400 turns of wire.  I am going to be using a bucket capacitor like The Geek Group on youtube built, and a 60 Hz high voltage transformer.  My primary will hopefully be 1/4 inch, and I wan't to know how many turns I need and if I can do a funnel looking shape like this one Tesla Coil.  One other thing is that my tesla coil is 30 inches tall, so does my primary need to get closer to the top to work.  I think I got all of the primaries and secondaries right, I know which is which, but sometimes I swap the words.  It would be a great help if you answered my question.

Question by jj.inc    |  last reply


Can you tell me how to find out the hv pin and the primary coil (input) pins from a flyback and the polarity of input ? Answered

I found a site from an instuctable (http://lifters.online.fr/lifters/labhvps/tht.htm) but it doesn't work. I have two transformers one is old from a TV and the other is new from an monitor, from that site I find out the primary and hv negative for the old one but i didn't find out the polarity of the primary coil pins. At the new one the methods from the site didnt work. please help me.

Question by theVader75    |  last reply


electronic ballast flyback driver...can i wind the wires around the primary of the flyback?

I have a electronic ballast and a flyback . I am having problems finding the primary coil pins of FBT because i dont have a multimeter. so i was just thinking that can i wind two ballast Vout wire around the flyback primary (the metallic structure , or whatever you call it) there are total 6 wires on the E-ballast. two are for input and 4 for output. the output wires are in sets of grey and white wires.  I was thinking that i will take one grey wire and wind it around the fbt primary(metal thing) and then connect it back to white wire. is this correct? also can i wound a feedback coil from the other 2 wires? PLEASE ANSWER....................ANY HELP WILL BE APPRECIATED. : )

Question by SHREYANSH_HV    |  last reply


Secondary coil, tesla coil?

Do I wind my secondary coil in the same direction as primary coil?

Question by wiccakingkamui    |  last reply


How does the num. of turns & voltage on the primary translate to an ideal voltage on the secondary?

In electronics, one of the things that has been the most confusing to me is the physics behind transformers. I have learned of that stupid formula a while back, where the ratio of turns is proportional to the voltage ratio and inversely proportional to the current, however, I know from reality that it is no where near that straight forward. As far as I can tell, it is a bunch of BS. Anyway, I want to know what the REAL story is, how the AC current going through the transformer is related to the magnetic flux through the core, and how that relates to the output of the secondary. What seems counterintuitive to me is that more windings on the primary should yield to a stronger magnetic field in the core for a given current, which means for magnetic flux (???) which seems like it should yield to more induced current in the secondary. Is the answer related to inductive reactance (more turns = more inductance = more inductive reactance = higher impedance at a given sinusoidal freq. = less current per unit of voltage?) Note: If you have a good physics and calc background and understand it to heart, pls do explain. However, I am currently only nearing the end of calc 2 w/ absolutely no formal education in physics, so I may have some difficulty with wank terms and vocab. (a.k.a. do not try to show off how many terms you know attempting to explain things in the most complicated and technical way possible.) Also, any good tutorials online that go into depth into the topic? ----------------------------------- The reason I want to know these things is that I wasn't to build a good 6A 0-+/-15V dual isolated channel linear power supply with many transformer tabs so I can keep the voltage drop on the pass elements as low as possible at variable output's so huge $$$ heatsinks are not necessary due to lower low power dissipation. (I have mostly figured out the LPS circuitry, but have not found a suitable Xformer online.) I can get the laminated magnetic cores needed relatively cheaply, however if I have to do some custom windings, I want to make sure I do not choose the wrong number of windings for the core. (obviously one turn on the secondary and 5 turns on the primary will pop a breaker @ 60Hz... )

Question by -max-    |  last reply


I'm trying to build a welder from microwave transformers, but I got this weird looking transformers instead.

I recently got two old microwaves from a junk yard and wanted to build an arc welder with its transformers by connecting both in series and getting an output of around 40V all together. But when I open the microwave instead finding the big chunky laminated iron core transformer as shown by many youtube videos, i found a small weird looking transformers instead. ( as shown in the pictures) I read somewhere stating that the primary coil should at least have 1 turn per volt. However, this transformer only had around 17 turns in the primary. The core was also not laminated and it had a copper wire holding it in place. The primary coil was made of a thick litz wire and the secondary was a very thin wire. Anyhow, I still continued the project and I experimented with one first. I use the same primary and made my own copper wire for the secondary. I made the secondary by using thick copper wire which I found in some antenna wire and I stacked it up and twisted it and put a heat shrink tube on it. Base on a few tutorials i saw i need an output of 20V from each transformer coming from an input of 240V AC. So with 17 turns in the primary i need around 1.5 turns in the secondary. When i finished everything and connected it to the power supply, it vibrated for awhile and then blew the 13A fuse in the plug. So i added a light bulb in series hoping to increase the resistance and reduce the current but this time nothing happen and it didn't even vibrate but the bulb did light up. I think its because the primary coil has a resistance around 5 ohm and the bulb have resistance of 100 ohm so the potential differences is very low on the primary coil. I am not sure why isn't it working. Please help me as i can't find any tutorials on how to make a welder with this form of transformer. There were no other transformer in the microwave so this was definitely the main transformer. Is the problem because it has too little turns in the primary coil or it has too low resistance? I don't know please help me. Thank you!!

Question by KhayhenS    |  last reply


Why?

Mission Statement: Nerf United Group's primary goal is to dremel, unscrew, and modify all nerf guns. As Stephen Colbert suggests 'Back off I have a gun'.

Topic by vanpaun  


Is this the right way to make a 2 MOTstack and is this the right way to ballast it with a MOT? for a tesla coil?

I just want to be a 100% sure that i did this right before i plug this thing in, because i don't want to kill the transformers or myself :D So if you guys could confirm that i did this right (or not and if not why) i might feel a bit more comfortable :) thanks for all the help! love this community and tesla coils! explanation: powersupply: 2 mots with the secondaries placed in series while the primaries are paralleled ballast: 1 mot with the secondary shorted (both ends to the core) and grounded to the mains ground the neutral wire from the mains is directly connected to the 2motstacks first primary while the hot wire from the mains is connected to the ballast it's primary and then to the 2motstacks first primary finally i taped one 2000V terminal to the wooden box and the other 2000v terminal to a 4ft PVC pipe that acts as a chickenstick Did i do this correctly? here is the picture with explanation from what i did

Question by colinbarnes    |  last reply


Tesla coil configuration. Audio amplifier power supply?

If I am to use an audio amplifier as a power supply for a Tesla coil could I do without a spark gap and primary capacitor? I will be operating the coil within the audible spectrum (1Hz - 20KHz) so an amplifier fits the bill. It's a 2 channel magnetic field power amplifier rated for 750W per channel. That's 750RMS not 750IFL. (If lightning strikes) The current would flow as follows: Power Amp> 4ohm Load> NST 5000v 60ma> RF Choke> Primary Coil> Secondary Coil 1. Do I need a capacitor bank between the RFC and the primary? 2. Can a few feet of 28AWG galvanized steel wire act as a reliable resistor for the 300W current? What about 750W? If not, what can I substitute? 3. Can the amp hold together? I need it in one piece. Please point out the flaws. Thank you

Question by imMrDude  


How do I permanently delete a tracking cookie? Answered

I use Internet Explorer as my primary browser and Symantec Endpoint Protection as antivirus. Everytime I run an full scan, it says it finds the same tracking cookie and its primary action was to be deleted. However, it appears again if I run another scan even though I don't use the internet between scans. Is there a way to delete this cookie and is it possible it is a threat to my computer?

Question by Dnamra    |  last reply


help me out with this transformer... I don't know about the connection?

This transformer is from 600VA UPS(220v supply)(using 12v battery). On primary side their are 4 wires and on secondary two wire. output on primary for the following : black- green=6.5Vac      black-blue=9Vac          black-yellow=7.7Vac......now how can I get 12V from this...?? help me....I want to use this as my power supply for charging batteries....  

Question by tajeshwar28    |  last reply


make a transformer? Answered

I am wondering how to make a homemade transformer for an early tesla coil (the kind with the flat primary and secondary coils). Thanks in advance, Josh1324

Question by josh1324    |  last reply


First Tesla Coil Answered

I purchased a small tesla coil kit online.  The kit is working but I need help improving it. Instead of having the typical primary and secondary windings with a toroid on top it has the driver circuit pulse a 50k transformer producing a 1 inch spark.  I'm wondering can the output of the transformer be connect to a typical primary windings and secondary windings with a toroid on top? I have a link below to the schematic. Also if this works would you recommend 1000 or 2000 turns on the secondary and how many on the primary?  30 or 36 gauge for the secondary? Link to schematic http://i92.photobucket.com/albums/l23/tucsoninsurance/Public%20Album/20130925_203001_zpse3c1927d.jpg Here is a link to the tesla coil  picture.  http://i92.photobucket.com/albums/l23/tucsoninsurance/Public%20Album/20130925_203600_zpsc84f3177.jpg Thanks for your help.

Question by mpatti75    |  last reply


Can secondary winding be first? Answered

I already have the ferrite with 250turns on it. if i wind the feedback and primary over the secondary will the circuit still works.

Question by ARJOON    |  last reply


ELECTRICAL TRANSFORMER? Answered

20 AMPS 12-0-12 VOLTS  BOBBIN SIZE PRIMARY WIRE SIZE AND TURNS SECONDARY WIRE SIZE AND TURNS HELP ME ANY ONE  PLEASE

Question by imamfarid    |  last reply