Search for fly back transformer in Topics


Fly back transformer? Answered

Ok, i have this transformer that i pulled out of a mac computer a couple years ago, i dont have it with me nut i think its a flyback. If it is, could i just hook it up to a battery and capacitor to make a charger or do i have to build some sort of modulator or switcher? Almost anything helps, thanks.

Question by budhaztm    |  last reply


Flyback transformer question.? Answered

I have an urge to play with high voltage.  Maybe a Jacobs' Ladder, maybe a plasma speaker, maybe just make sparks and burn myself. Does the make / model of flyback transformer matter?  Or do they all connect the same way? For instance, would you recommend this model?

Question by Kiteman    |  last reply


old Monster Fly Back transformer!

Old Monster Fly Back transformer! I have one old school fly back transformer, This thing is three times the size of a normal fly back. I think it is worth about 3 fly backs, because I really don't think I can find another this size the cost should be $30 If you don't think its worth the cost, I'll just junk it and use it on one of my other projects, you just can't find too many old CRT transformers any more, just newer smaller ones. you can leave me a comment or send me an email. the fly back is a little dusty.

Topic by inductionheat!    |  last reply


Fly back for SALE $5

I have one flyback transformer for sale for $5

Topic by inductionheat!    |  last reply


Fly back transformer for sale

This is a flyback transformer type that so many people want  I have no clue why they think it is Superior to the regular modern flybacks.  maybe simpler? If some one wants it   $10    also comes with a ceramic high voltage diode.

Topic by inductionheat!    |  last reply


2 free Fly back transformers and a SCR

I have one 300 AMP 1200 volt  SCR that I want gone!  I want $25 for it  . I am willing to trade it for crystal radio parts or small vacume tubes . I have two modern flybacks also if anyones interested sorry! dont have pictures

Topic by inductionheat!    |  last reply


how to fix the broken pins of fly-back transformer?

I have broken the primary & secondary coil pins of a fly-back transformer and i need to repair it. can anyone help?

Question by ferraririder123    |  last reply


(4) flyback transformers for sale

I have four flyback transformers for sale, I have marked where the ground is for the HV on them. they are in a fine condition. I would like to get a few of them off the shelfs, they are taking up too much room. I want to get $20 for them and I will also ship them any where in the united states for free.

Topic by inductionheat!    |  last reply


How to remove electron gun from an old tv?

There is currently two old tube tv's on my street and i have already scavenged components like the flyback and 400v cap, but i was wondering if there was any way i could remove the electron gun for experimentation in vacuums. If anyone could explain it to me or post a link to vid, instructable or webpage it would be very helpful.

Question by makincoolstuff    |  last reply


can i use fly back transformer for Tesla coil?or which transformer you suggest which can be found easily and cheap?

I love Tesla coils its very initial level of me ...i have just started

Question by sara rarara    |  last reply


How much voltage does a 30kv fly back transformer need to put out 30kv? Answered

How much should the input voltage be for it? Cause I heard that 120AC can destroy it. I need to know. thanks

Question by Mudbud    |  last reply


Flying car idea

I was thinking about building a flying car that would have most wingspan hidden under the car (pops out when activated) and the doors would be the tips. (What used to be the back doors would roll over van-style, and the back would otherwise be covered by sheet metal) In the back, there would be two vertical rudders and the spoiler would be cut into flaps for horizontal rudders. The thing would overall be powered by two helicopter jet engines. Once the flight system is activated, the gear shift (auto trans) would turn into the throttle, and the gas/brake pedals would turn into the rudder pedals. The idea is to make a flying car that still (when wings are stowed and trunk cover is closed) looks like a normal car. The question: is this possible?

Question by red.baron    |  last reply



What should I do with my electric fly swatter?

I just bought one from the thrift store and I want to hack it. Any suggestions on what I can do?

Question by WerdnaN    |  last reply


Awful back-of-the-magazine tat

Somehow, I stumbled across this bloody-terrible piece of cack on the internet: Flying Scotsman-Memories of Steam Cuckoo Clock And remembering the: Elvis Presley Dambusters Clock Plate of Tutankhamun I could not honestly tell which was real, and which was a "piss-take". There are more... what did you see in the back of that thing you looked at printed on cheap-paper?

Topic by lemonie    |  last reply


How can I get a fly back transformer from a ionic air purifier to work?

I took apart a ionic purifier and i haven't cut many wires(I needed the switch.), but i need help using it as a hv supply. There's four different wires red, black, yellow, and white and i need to know witch ones to connect to get it to work. I'll have pics later. UPDATE: Now I have pics. P.S. It worked before I took it apart.

Question by RocketPenguin    |  last reply


Can we fight back Big Brother?

Conoy Township in Lancaster County, Pennsylvania; is voting to avoid flying surveillance remote controlled aircrafts above their skies. In a time when the United States government approves the use of drones to spy on the civilian population, I have found interesting how people are responding. This municipal ordinance definitely will not stop the use of drones on this area if deemed necessary for our national security but I wonder if this could be the start of a trend.

Topic by blkhawk    |  last reply


help with installing a doorbell transformer?

I just bought a doorbell transformer and i know how to do everything but install the transformer.. i know it could be hooked up to a junction box i just dont know how. it has three wires on the back, and a junction box i looked at had four different colors of wires in it. i do not know how to install it. please help me.. thanks

Question by 87bhoward    |  last reply


How to use a transformer to step-up voltage

Hello! I was wondering how to use a transformer to step-up volage. I got one of those shocker fly swatters and took it apart, and saw that it used a couple of transistors, capacitors, and the main thing, the small 5-pin transformer. How does it work? How can I increase the voltage? 

Topic by HavocRC    |  last reply


How do I run multiple digital picture frames from one power source?

Hello I want to take a large picture frame and mount 6 or 7 digital picture frames inside it  behind mounting card - almost like a collage.  What I'm wondering though is if there is a way I can use a single power supply to run all of the frames?  It's not necessarily a problem if I can't but I was thinking it would be much more tidy if I have one power supply and 8 cables rather than 7 power supplies and 14 cables. I can make it so there is only one cable coming out of the back of the picture frame by using a multi socket extension inside but again this is going to add to the size of the enclosure on the back of the frame. So does anyone have any suggestions they can offer please? Thank you in advance. David

Question by blainerenegadewoyer    |  last reply


Does my garden 250 watt AC/DC transformer consume 250 watts when I only have 50 watts of DC LED lighting?

So the question is:  Does an AC/DC transformer consume its max wattage even when it's not maxed out on the DC side?  I have a 250 watt transformer that steps down to 12V for low voltage garden lighting.  Is it always drawing 250 watts?  Added up, I have about 50 watts of LED low voltage fixtures. Back in my military days, when we were in Europe, we had these 300, 500, and 1000 watt transformers to step Europe 240V down to US 120V, and we were always told those transformers drew their max capacity even if a small radio was plugged into it. I argued it prolly didn't because of the conservation of energy thing. I can always put a kill-a-watt meter on it too I guess. Thanks in advance!

Question by SeanW65    |  last reply


Back-room inventors' contest.

From the Popular Science website: World-changing devices don't need to come from big labs funded with big money. Sometimes radical technological innovations roll, whir, or fly out of basements and garages. Do you know you've invented something that's poised to disrupt a market, or have you toiled building prototype after prototype in your home workshop to prove your idea works? Whether you're a professional engineer working on a self-funded side project, a hobbyist who has launched a successful crowdfunding campaign to refine your gadget, or an obsessive teenager who's built a sellable product in your bedroom, please tell us about it! Enter the seventh annual Popular Science Invention Awards. We’re looking for game-changing products developed by passionate, independent inventors -- not academic or corporate R&D; labs. Popular Science editors will pick 10 entries that best represent the spirit of homegrown ingenuity and solve real-world problems in a practical, innovative way. Then, in our May 2013 issue, seven million readers will get the first look at the winners. This is right up your street, Instructablers, because you have to make a thing, that you can show working, and you are not allowed to enter if you have a commercial or university research department backing you up. Link for more details.

Topic by Kiteman    |  last reply


5v dc to 18v dc? (it can't be as hard as I am making it?)?

I need a step up transformer to go from my average bench power supply (5v dc) to 18v dc (the same I would get from 2 9v batteries). I have an associates in electronics but it's from 10 years ago and I can't make the information come back into my brain. Any help would be appreciated.

Question by Random Point    |  last reply


Help Identifying unknown Transformer

Hello I got this transformer from an old ups, there are four wires on the primary side black, blue, green , yellow and two on the secondary red and blue. This transformer used to charge 12v 7.5ah battery also converts it back to 220V in backup mode. Tried testing its output and got this (Mains 220V) Black to ground Blue to mains-> 7.9v on secondary Green->5.5v Yellow->6.5v Connecting Blue and Green to mains and it was a shot circuit and blown my fuse. I want to use this for making a decent power supply 12v+ output, is this possible? I also saw this video https://www.youtube.com/watch?v=mc4GZM-kFUY&hd;=1 The guy is using his ups transformer for generating hv to power cfl using tip122, i am not sure how to do this using my transformer. I need to make use of this transformer somehow, otherwise its just eating dust at my home.

Topic by Clarkdale44    |  last reply


Question about winding coils.? Answered

So i need to wind some coils, and i suddenly though about it, and now i need to know if im on the right track. When winding coils, will winding the second layer, back over the first layer, in the same direction (for example clock wise) cancel out the coil? also, i bought a galvaniced threaded rod, thinking it would work as a core. it would work right? What if i had a 8 turn primary. Should it be under the secondary coil. Or could i wind the secondary to the side of the primary? thanks :) 

Question by dumle29    |  last reply


i need help wiring a lighted rocker switch to a transformer. Answered

I have a power board from a guitar amp that is missing its AC power jack. The Lighted switch and transformer are still there but all of the wiring has been cut out and i am not sure how to wire it back up. I took the three prong jack out of an old computer power supply and am having a hell of a time figuring out what the correct way to wire this up is.  The switch is an 8A 250V lighted switch with 3 posts on it, the transformer has a white, black and brown wire (center), of which the brown was coiled up and zip tied not in use. The white wire has a corresponding 0V on the top of the transformer, the brown 100V, and the black 120V.  An explanation of what wires should go where would be sweet. Thanks in advance.

Question by strebor71    |  last reply


flyback transformers, a little help please.

I just took apart an old monitor for some high-voltage experiments, but I am wondering how I should feed the voltage back to the Flyback transformer. there are 3 wires, the one with the suction cup (the 10,000 volt wire), a white one and a red one. should I use the white or the red to finish the circuit? or is it enough to connect it to the ground? or doesn't it even matter?

Question by kirdaiht    |  last reply


How do I get the oil off my flyback transformer? Answered

A while back, I decided to submerge my flyback in canola oil to stop it from ruining itself. As it turns out, submerging a flyback in canola oil is a very stupid idea. I want to clean all the oil off of it so I can do it right the next time, but I have no idea how to safely do that without damaging the flyback. Can anyone help me out?

Question by Shagglepuff    |  last reply


Can I use a DPDT Toggle Switch, To switch a Transformer output from series to parallel?

Hello,  I am working on a project were I need to use both 24V and 12V ( one at a time ). The project originally calls for a Radio Shack 273-1512 but I needed a smaller pcb though hole mount transformer for my use. My transformer outputs 24V @ 1.5A in Series and 12V @ 3A in Parallel. Is it possible to wire up a On-Off-On DPDT Toggle switch so I may flick back and forth between the two? If so, would you be so kind as to provide a diagram. I have a feeling I am over thinking this and just need to take a step back to see the whole picture. I thank you for your help and advice in advance. Transformer I have -Hammond 164J24 115V Here is a link to the data sheet. http://www.hammondmfg.com/pdf/5C008-9.pdf DPDT switch I have -NKK S7A-RO Here is a link to the data sheet. http://www.mouser.com/ds/2/295/stogglesmedcap-33336.pdf

Question by kyo-89    |  last reply


whats the easiest way to convert 120 VAC from wall to 24 VAC ?

A friend gave me a security camera without power wires. on the back it  has 3 power terminals  - 24 VAC - GND ( ground) - 24 VAC  should i just try to find a wall adapter that puts out 24 volts DC and then take it apart and take out the rectifier ?     im guessing thats how they work.   THANKS :)

Question by blackghost    |  last reply


Electromagnet back emf (CEMF), need advice Answered

So the specifications of the electromagnet : 24v 0.2Amp Holding force 500lb The input is 24v, .  once the voltage is disconnected the Back EMF will occur, at that instant there still is a magnetic field which collapses very fast, in collapsing it 'cuts' the coil at high speed and the higher the 'Q' coil the more voltage is 'generated'. I imagine that my electromagnet that can lift 500lb with 24v will generate a huge CEMF. So my question is, approximately how much Cemf should I expect and could I use it to recharge my batteries? Let's say I switch it on for 1sec than switch it off. There are techniques for back emf suppression, http://www.progeny.co.uk/Back-EMF-Suppression.aspx I would like to redirect it, transform it to make it usable and recharge my batteries with it. If I manage to do it, will I get at least as much power from the cemf in order to be able to recharge my batteries (or capacitator)

Question by Maxc13    |  last reply


Whats the best way to test the output of a transformer? Can I just use a multimeter?

I have a guitar amp that I want to make portable but the transformer isn't labeled, so I don't know what kind a batteries I need. Is the multimeter a valid option, or is there another way to find out how much power is coming out of It? Unless you can identify the writing on the back of the transformer (which I already googled).

Question by stoney123    |  last reply


Is It OK For Me To Use This Transformer?? Answered

I have a few questions about my transformer that I scavenged from an audio amplifier. I assume this transformer was used to drive big speakers. This bad-boy weighs in at eight pounds and is pictured below. The coil has a resistance of 2.2 Ohms. Is that normal? The Impedance of the transformer @ 60Hz will be higher that 2.2 Ohms, right? The transformer was wired into the wall outlet (120V AC) with only a #102 (1000pf) ceramic capacitor and a 125V-6.3A fuse in series. that means that the power comes from the wall goes through a fuse, a transformer, a ceramic capacitor, and then back into the wall. The fuse was burnt-out so I am bypassing it for now. I fully intend to get one asap. The #102 ceramic capacitor either isn't working or limits the voltage too much so I am bypassing that as well. What is this capacitor used for? Some of the voltage levels that I am measuring from the outputs of the transformer are as follows: 5v, 30v, 40v, 60v, 80v, and possibly a 100v measurement. There are a lot of outputs on this transformer so it is hard to remember all of the voltage levels. Is there anyway to tell how many amperes I can safely draw from this transformer? (I have no datasheet and cannot find one) Thank you for taking the time to read my plight! I would really appreciate a reply! Thanks!

Question by jensenr30    |  last reply


Airzooka into a nerf long range rifle?

I purchased an "AirZooka" a while back at just got into nerf. I'm about to transform the airzooka in to a nerf rifle. I'll post comments latter on the results. Think it'll work?

Topic by Wafflicious    |  last reply


Is it safe to hook this transformer up directly to the AC mains? Answered

I bought an old high voltage transformer from the internet a while back. It seems to work well at AC frequencies (anything higher and it doesn't work at all), and can make some pretty good arcs. When hooked up to a power outlet with 360 ohms of resistance in series with it, it produces a 1.3 cm blue arc. When using a 30 ohm resistor, it makes crazy arcs with a bit of orange (I'm using four 5 watt 120Ohm resistors in parallel, and they still overheat). None of these tests caused the transformer to heat up at all, though. Would it be a good idea to directly hook up the transformer into a power outlet? Would it burn up the transformer and/or my house? A couple other things about the transformer: The primary has around 2 ohms of resistance, but I don't know anything about its inductance. The whole thing is pretty hefty and has a fat iron core. If you brush a wire from a 12 volt power supply across the primaries, you can get a nice spark c: Any help would be appreciated. 

Question by Shagglepuff    |  last reply


How do i make a capacitor charger circuit? Answered

I am talking about one for in a coilgun. i had a old (very old, 1.3mp) samsung digimax 101 digital camera, I decided that since i have moved on it was time to take it apart for the rich insides. I knew what to look for, so i found it; the transformer for the capacitor charging circuit and the big cap for it. I unsoldered the transformer piece, cut the wires from the cap (it was not mounted on the board), and unsoldered the flash which had not 2 but 3 wires coming from it. one was yellow, one was green, and one was black and was attached to the deflector behind the flash. the black wire was connected to a small black piece that looked a lot like the charger transformer but only had two active pins instead of four. im not sure what it is for, i think it is a self resetting fuse, incase the camera short cicuits, but im not sure. any insight on that would also be helpful. Back onto the subject, i would like to know what i need (other than the yellow transformer piece) to make the charger circuit. I have heard there was a transistor, would it be NPN or PNP? there was also a diode, i am guessing one of the black ones, but is there anything else? i have those three things if that is all i need, but how do i solder it all together? thanks in advance, z247 PS: the yellow transformer has only 4 pins that actually do anything, one is between two on one side and is only for support. either that or i accidentaly broke it.

Question by zack247    |  last reply


My Laptop Is Broke. But how? Answered

I have an old dinosaur laptop (a Fujitsu Life-book C2330 approx. 7 years old.) that worked up until very recently. I packed it up in my closet for a few weeks, and when I decided to re-purpose it, the laptop wouldn't power up. I believe the problem is not in the laptop itself, but in its power transformer. When the transformer was working, it would make a high-pitch, low volume, whine. But now the transformer only whines once for a half second every five seconds. This could maybe be attributed to a blown capacitor or other electronic mishap. If that is the case however, it would probably be more worth my time buying a new transformer. My second idea is that the transformer has been damaged but usable for a while, but the laptop requires a slight charge of some kind in the battery to get it going, and the old transformer doesn't have the guts to give that charge. Metaphorically leaving me with a car with a dead battery, trying to jump-start off another car with another dead battery. If this is the case, then I should buy a new battery. My third idea is that both the transformer and the battery are not the problem, and it is the power jack that is the problem. I had to open the computer up not too long ago to re-solder the loose power jack. The screws that attached a ridiculously large EMI cage to the motherboard were stripped, so I had to drill them out, and then bend the EMI cage about 45 degrees. That allowed me to fix the power cord, but it also damaged my internal wireless card. After putting it all back in one piece, the laptop worked fine until I bought a new one, when I put it in my closet and forgot about it. Which brings me back to the thought that the power jack is broken. But it doesn't look broken at all, it doesn't feel broken, and it doesn't jiggle in the laptop. And if the jack is broken, I might as well just give up. The last possibility, is that the laptop, the transformer, the battery, and the power jack are all usable, but the power cord, which looks fine on the outside, might have lost its conductivity, or become frayed and detached inside its rubber casing. Which can be easily fixed by opening it up and reattaching the wires. That's my situation. I don't know which of these ideas it is, but it has to be one of them. I appreciate any help I can get. Sorry for the bad image quality. Not that the pictures help much anyway. Thanks, Sam

Question by martzsam    |  last reply


help with changing transformer output of 8.5VAC 1200mA to 9VDC 1000Ma.

Howdy folk,    The Problem; I need some experienced assistance with changing the output of a transformer from 8.5VAC @1200ma to 9VDC @1000ma. Thanks in advance for any & all assistance.    The Back Story; The left channel went out in my PC speakers, which is designed for 230VAC, I had to destroy the woofer case to get to the transformer, and discovered that it outputs 8.5VAC @1200ma. I have another set of PC speakers (different manufacturer) that takes US voltage (110v) and steps it down to 9VAC @1000ma. I must first plug that transformer into a 100watt 230>110 step down (because I'm currently in the Philippines) and I want to get at least one transformer out of the "equation". I would just buy another system set up for local voltage, but I'm on a fixed income (until I can return to the States) that prohibits this avenue. I CAN afford some small components, but that's about it. Thanks again for any help. -Z-

Topic by Zclip    |  last reply


The transformer in my Tesla coil fried, how can i prevent this from happening again? Answered

I recently built a tesla coil, and after some demonstrational use in school the transformer burnt out (it wouldn't do anything, and a red light appeared inside). I have already ordered a new one, but i want to prevent this from happening again. Any tips from experienced tesla coilers? thx in advance, all help is appreciated.                  additional details: transformer: 6500v, 21 ma. ordered here. the tesla coil has gone without sparking for a few seconds at a time, however resumed after turning it off and back on. could this be related to the spark gap length or something similar?

Question by biolethal    |  last reply


Flyback driver from monitor circuitry?

So i've been into hv stuff for years,currently engineering undergraduate, just never did anything practical. So recently we got a new microwave, therefore old microwave= junkyard ^_^. Anyway, i acquired a MOT i also took the capacitor and diode, and the magnetron (never know when you could crave instant cooked meat ^_^ kidding). Then a few days later (last week) someone left a computer monitor outside on the sidewalk, which equals source of flyback ^_^. clearly someone up there wants me to play around with hv (or is it someone down there..?) and so thats how i  came into possession of a flyback. i could have had one a while back, we had a big tv, which had one of the big old flybacks which are way better than modern ones, but this is before i knew about flybacks and so i dismissed it as some large junk...to this day im still slapping my forehead over the fact that i let that go... Naturally, i have a few questions: 1. I hooked up the mot to mains (deadly i know) but the arcs were insane. i tried ballasting it with a cfl bulb, 15 watts, however, when connected the mot did nothing. touching the hv to ground only made the cfl brighter. why? 2. i pulled the flyback with the circuit, i actually took out the whole board from the computer monitor. how can i use this as a driver? i know i could pull components out and make one but seems to me whats already there would be good enough. 3. Found out i can use a cfl to drive the flyback, can i also use this for the mot? one other thing, i was thinking of using the mains transformer (torriodal transformer) from the monitor to power the mot and/or flyback, using it as a step-up or step-down transformer. Is this possible with the flyback? Thanks, and sorry for the loong question im just excited ^_^

Question by fire_fist_ace    |  last reply


Some new stuff i got

So recently my dad wanted to throw away a old tv we had that had a bad cord (yeah we could of easily replaced the cord but be have enough tv's..) and i remember seeing plasmana's plasma speaker a while back and that it used a flyback transformer, so i ripped the tv apart taking the pcb with everything on it, speaker, and the coil thingy on the tube, since it was the first time i took one apart i had cliped the magnet wire winding so thats almost no good so i just got rid of that, and then i took apart 3 other monitors i have gotten over the years, one had a set of speakers inside it, and that was interesting to use. and a while back my friend gave me a old 5cd/radio stereo, i would of just kept it using it for the 5 disc changer mostly but the door was broken, and didnt move well at all, so i scraped it and used the speakers. Oh and theres a PSU in there i ripped apart a while ago, i have another but its stored away currently. Anywho heres just a view of what i got, any ideas on what i should make out of all this?

Topic by knexsuperbuilderfreak    |  last reply


How to find the correct transformer for a power supply project?

I can find the correct part online from the schematic I am reading for every one but the transformer. The symbol for it states that it is a metal core transformer that one side (2 leads) connects to an outlet plug (117VAC) but the other side has has 3 leads labeled 0V, 24V, and 30V. There is a switch that goes between the 30V and 24V leads to allow you to switch between 15-30V or 0-15V, then connects to a diode bridge in which the unregulated DC heads to the regulator. I can see that it's a tapped transformer, but how do I find such a part at, say, Jameco or DigiKey? What are the search parameters? I find nothing if I search for "117VAC (or 120VAC) to 30V transformer". If I want to find a certain diode, capacitor, or transistor, it's a snap, but I have to back away from projects that require transformers because I'm not sure how to find exactly what I need even if I have a schematic. Any help would be greatly appreciated. Also, if it helps, I got the schematic from page 472 of volume 2 of the Encyclopedia of Electronic Circuits (Rudolph F. Graf).

Question by Xombee    |  last reply


Is it possible to use the guts from a flash disposable camera as a high voltage square wave generator? Answered

Is it possible to use the guts from a flash disposable camera as a high voltage square wave generator? I know that in order for the transformer to work it must use AC voltage so the 1.5 DC is changed to some high voltage AC but I'm not sure if it is square wave or just regular sine wave. And I'm also not sure at what point the AC is changed back to DC for storage, any help? A schematic or some diagram would be much appreciated!

Question by arhodes18    |  last reply


rubber bands wont always fly off of rubber band gun, need help?

I'm trying to make a simple rubber band gun but the rubber band im using dosent allways come off, it usually flings forward then back not leaving the allen rench I'm using. i need  some advice on getting the rubber band to leave every time. ( the nail in the pic is just there so i could take the picture, cant pull the rubber band back at the same time and get a good one) nails on the side are to hold the rubber bands when not in use.

Question by Vertox    |  last reply


Plasma alarm clock?

I am thinking it might be fun to hack the speaker output on a digital alarm clock to somekind of plasma device that uses a flyback transformer. Something along the lines of a lightning alarm clock that was released a few years back.

Topic by argos090    |  last reply


restoring a knife

I recently acquired a knife in poor condition. It is a Frost Cutlery Flying Falcon lock back. The thumb catch knob is missing and I was wondering if any one had an idea to replace it. Also, I was wondering if anyone had any info on stainless rostfrei.

Topic by masterochicken    |  last reply


power hack

Aside from it being an ugly hack, is there any reason I can't strip the wire back from the end of a printer power cable and solder it to the plug terminals of a 5v wall wart transformer? This shouldn't be a fire hazard since the power cord should be rated correctly, correct?

Topic by randofo    |  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


Needing Schematic for a High Amp Power Regulator

I have two transformers ( 430-7101A) that're wired together from a APC Battery Back-up that I'd like to turn into a high amp regulated power supply. I've been looking through the site and have seen very few options. I'm positave that (sorry for the pun) there's a shematic somewhere out there and would Love to get my hands on it. These are a very nice pair of transformers that I'd Hate to see go to waste. And help would be Great! TIA

Topic by your_dragon113    |  last reply


Geting started

I would like to help people start building and flying model aircraft! I started flying unpowered gliders with my dad at the age of 5 by the age of 8 I could do figure 8ts with the same model of unpowed glider, then I moved to my own plane a wingo which is a great durable slow park flyer, the kit comes with every thing you need except for a controller, servos and glue. I put a brushless motor and a lipo battery with this setup I could fly strait up until you could barely see the plane (about a mile high). After that I got my first 3d trainer a ucando which is also durable and constructed with hot glue!!! So far I have crashed into a blueberry bush and torn wings to pieces, but I am in the process of gluing back together.I prefer electric models over gas or glow models; their cheaper, quieter, smaller and more durable. Here is a great place to find beginner and advanced electric planes. Their are also different types of kits, ARFs (Almost Ready to Fly) are my favorite type of plane they include most of what you need for the plane inside the box, most only take 2-6 hours to complete and dry. Much easier for beginners to build and not mess up. Normal kits have only parts and dont usually include motors batteries or any thing else, they can take weeks to build but can be much cheaper. And theirs a third RTF (Ready To Fly) more expensive than ARFs but most of the time all you have to do is charge the batteries! You should visit your local hobby store to find out more about the local clubs and flying fields it is illegal to fly some sized planes in naborhoods I am not familiar with all the laws but I only fly at flyingfeilds. A plane like the warp would probly be fine to fly in your back yard or naborhood field. You should know that making model Rc planes can be addictive, expensive, and when you crash and destroy what you have been working on for a month extremely frustrating.Join the AMA and your local flying club, model aviation is a great way to make friends and meet new people, oh and its fun! For all ages!horizon hobby is a group of hobby stores. hobby store locatorIf you have any Q's please ask!Id also like to start a list of good trainers the yard stick is not as durable as the wingo but can be found every werethe wingo a great beginer ucando a 3D trainer (get a wingo first)

Topic by i make shooting things    |  last reply