A look at the operation and circuitry of a tool or equipment demagnetiser.
Пікірлер: 327
@Hopeless_and_Forlorn8 жыл бұрын
As I remember, most CRT TVs had two components in the degausser circuit--a thermistor and a varistor. At turn-on, the resistance of the thermistor was low, and the resistance of the varistor was high. As current through the thermistor to the degaussing coil heated the thermistor, its resistance went up, and the increasing voltage to the varistor caused its resistance to go down. Net result was that after a few seconds of current to the degausser, the current was gradually switched over to go through the varistor to the TV power supply to start it up. We used large degausser coils on aircraft occasionally to remove magnetism from ferrous parts, particularly those near magnetic compasses or compass flux valves. On rare occasion, an entire nose gear strut would become magnetized by a lightning strike to the forward fuselage, and it would have to be degaussed. The problem presented itself as a sudden swing of the standby magnetic compass in the cockpit when the landing gear was retracted or extended. Extended, the gear was too far from the compass to affect it. Retracted, the strut was in the wheel well directly beneath the cockpit floor, and, if magnetized, close enough to the compass to cause a substantial deviation. Needless to say, magnetic compasses, flux valves, and other sensitive equipment had to be removed from the area before a degaussing coil could be brought near.
@andygozzo726 жыл бұрын
yes, earlier circuits used a single ptc from the mains, then 680 ohm resistor to ground, degauss coil fed in series with a varistor from the ptc and 680 junction, and ground, then they went to dual ptc in one unit, with the second ptc across the mains(but a higher resistance type), then seemed to go to just a single ptc...
@Limou5515 жыл бұрын
airplanes mechanic detected. ;)
@davelowets Жыл бұрын
Many of the later CRT degaussers used a relay that turned on and sent power to the coil for a few seconds at switch on, and then turned the relay back off. You could hear the click every time those were tuned on, and then a click again a few seconds later. I once had a CRT computer monitor like this, and it also had a manual degauss button that would energize the relay for a few seconds when pressed. It was always weird to watch the display suddenly bounce back and forth, all over the place, when you pushed the manual degauss button.
@CristiNeagu8 ай бұрын
Sounds like throwing a thermistor in this demagnetizer could make it automatic... #badideas.
@angeldelvax72196 жыл бұрын
Tip for a DIY degauser: the water valves in a washingmachine have fairly strong electro magnets, similar to the one in this degauser. They are fully watertight. Mount one of those in a n ABS box with a switch and you're ready to go ;) (it's something I learned about 30 years ago :p )
@josepeixoto33842 жыл бұрын
Wow, that is a great idea, have a few of those around; never thought of that, thanks.
@johnwang9914 Жыл бұрын
Most CRT's such as an old TV would go through a degauss cycle when powering up and later models especially computer Trinitron monitors had a degauss cycle you could select. At one seismic data processing company, a user thought he would be a smart ass and said "You want to see something neat" and he put a company fridge magnet onto the screen pulling all the electron beams to it. He thought it was really cool till the degauss cycle wasn't enough to remove the distortion completely, once he resigned himself to living with a screwed up screen due to his immaturity, I took the powerful magnetic fridge magnet and carefully waved it across the screen at various distances and locations to skillfully stretch out the screen back to a reasonable display and told him not to do that ever again (hopefully the degauss cycles will even out whatever wavering remained over time). Everything the degauss does can be done by hand with a powerful magnet but it takes time and skill, the demagnetizer is just a simple way of doing it and these watch demagnetizers are dirt cheap, about $15, $25 wth a quality compass to test if the watch is magnetized. If you still have a mechanical watch, these demagnetizers are worthwhile for whenever they start to run a little fast as it means the balance beam is getting magnetized perhaps by standing too close to a washing machine for too long or just walking past a transformer (mind you skillfully waving the watch around the transformer will also degauss it). Any magnetism tends to speed up the watch or even freeze it because the effect on the magnetism on the balance beam is to have it act as a shorter beam, you can see if the compass is magnetized by moving it near a compass to see if it reflects, not all of the compass apps on smart phones are sensitive enough to pick up the deflection though one of three I've tried has picked up on my fast running watch, best to use a quality mechanical compass. Used to be the first thing a jeweler would try if you complained of a fast running watch is to test it with a compass and degauss it with these cheap degaussers but now with so many quartz electronic watches, few even carry the degaussers now and would just ignore a fast running me handicap watch or charge you $200 for an overhaul which usually means sending it to a factory for six weeks. There used to be mechanical degaussers that used a strong permanent magnet which did not need to be plugged in but they were were heavy due to the shielding needed, they were mechanical as sometimes you had to spin the magnet to alternate the field. You can buy permanent magnets that you use to magnetize or demagnetize screwdrivers with, same concept, you'll trying to neutralize any magnetism that's there by applying varying magnetism to the object.
@davelowets Жыл бұрын
@@johnwang9914 The CRT would have eventually come back to normal without all the fuckery...
@davelowets Жыл бұрын
@@johnwang9914 Just so you are aware, a mechanical watch WILL start to run faster when it's internal lubrication drys out or ends up slung out of all the bearing points. The lubrication actually puts a drag on the internal parts, and slows the watch down, to which the speed is set to at the factory. A fast running watch usually means it's time for a lubrication service.
@johnwang9914 Жыл бұрын
@@davelowets I have no doubt that a mechanical watch works better with oil and will eventually need more oil. I'm just saying that Seiko actually has several types of oil and grease and it's easy to over apply the oil with unpredictable results. Just look at the Seiko maintenance manual, portions of which are posted at the Seiko US website. Geesh, people's know it all egos... (Of course oil makes mechanical watches work better)
@AttilaThebung9 жыл бұрын
My grandfather taught me to demagnetize things by beating the shit out of them against a bit of metal. It used to work pretty well.
@TheOriginalEviltech9 жыл бұрын
AnthonyH That gets the electrons going again, i have heard of the effect!
@AttilaThebung9 жыл бұрын
Eviltech Nothing quite like waking up those lazy pixies!
@cbdougla9 жыл бұрын
+AnthonyH Yes. That always worked for me. Whacking a screwdriver on a hard metal surface works wonders for taking away the mag field.
@Tocsin-Bang7 жыл бұрын
Heating things beyond their Curie point works too, then quenching them rapidly. You can also magnetise a steel bar by lining it up with the Earth's magnetic field and hitting it repeatedly with a hammer.
@ZZZRSC7 жыл бұрын
Yeah, try that on a mechanical watch or a CRT.
@salerio619 жыл бұрын
Personal anecdote ... When I got my first wide-screen telly I probably didn't turn it off for a couple of years (used the remote) I noticed the screen was distorting colours and it got worse and worse over about 6 months. I was ready for chucking it out. One night we had a power cut. When the power came back on the telly powered up with a "thunk" sound and suddenly all the colours were right again. I figured out for myself that the thing degaussed itself only when it had actually been turned off by the switch for a couple of hours.
@andygozzo726 жыл бұрын
thats one of the reasons why its not a good idea to shut a tv off on standby all the while... 😉
@WELLINGTON203 жыл бұрын
that only works for crts
@salerio613 жыл бұрын
@@WELLINGTON20 Yes I know
@dimitrijekrstic75672 жыл бұрын
@@WELLINGTON20 exactly why he mentioned it
@mrkitty7772 жыл бұрын
And degaussing makes a lot of noise in a CRT.
@DrRChandra8 жыл бұрын
I have a bulk tape eraser which was sold to erase VHS cassettes which could likely be used like that. Same thing, it has written on it the duty cycle, something like 1 minute on, 30 minutes off. It also has some sort of temperature sensing mechanism so if you try to abuse it by operating it too long it'll cut out for a while. Whenever I held a screwdriver or something like that against it and pulled the trigger switch, it would make a scarey loud buzzing sound. What I was lacking was the idea to pull it away slowly. Thanks for teaching.
@12799MaDeuce7 жыл бұрын
for some tools like crescent wrenches or screwdrivers, I find that a few good whacks on the workbench works quite well for demagnetizing them
@neopixelindustries1168 жыл бұрын
I love your videos, I literally watch them for hours at a time while at "work". I have learned a bunch and owe you many thanks!
@ChoppingtonOtter8 жыл бұрын
This vid made me Remember us sticking large magnet (ripped off an old speaker) on a school CRT TV to see the effects as a kid then panicking when the TV didn't immediately recover lol.
@garethwilliams58093 жыл бұрын
Been there, some that, have the t-shirt
@nathanlucas64656 ай бұрын
Kids today will never know the joy of seeing the picture on a crt go all wonkified and then the panic when it doesn't return to normal 😂
@rustyjones56068 жыл бұрын
in the 70's they were selling these as cassette tape erasures . The same push button design with a bigger coil. Love the channel. Kel
@stephenarling16674 жыл бұрын
This reminds me of my grandpa's watchmaking bench from many decades ago. One of the tools was a degaussing coil, wound on an oval form and mounted in a finely finished nickel-plated frame. The gadget was fixed to a lacquered hardwood base, with a momentary line switch resembling an old-fashioned telegraph key. p.s. The line cord was attached with Fahnestock clips screwed to the hardwood.
@bradkerr2798 Жыл бұрын
Shake Hands with Danger. Beautifully crafted and finished Danger. Love those old tools where safety was "just don't touch that part"!
@cleverkimscurios37835 жыл бұрын
Well thanks! I bought one of the cheapie block ones hoping I could degausse my pliers, and that didn't work. So thanks for this. Now 1- I know how it works, 2- I know what to buy, and 3- listening to your accent while you explained it was a delight. Thank you!
@enlightendbel7 жыл бұрын
Remember, the metal wires can be magnetized too. Something you first picked up with a magnet will be slightly magnatized a tiny bit, so it will then snap to other metals. So, to test if you correctly demagnetized a tool, test it on something you know is not magnetized.
@Dave-gq8xz6 жыл бұрын
You had me at 1:45 when you mentioned the high magnetic field it's putting in my tool:)
@FailedSquare8 жыл бұрын
You can demagnetize stuff like screw drivers and snips by dropping them from a modest height onto a hard surface. It sometimes takes a few drops but it works pretty well and its free.
@dandavis85008 жыл бұрын
Hi BC.C. I was a display tech on navy ships in the 90s. All my purpose built displays had a manually actuated degauss coil but I became the procurement consultant for IT when they began to purchase computer monitors because sometimes deguass was manually actuated, sometimes not. But once the ship was underway something about salt water brushing against a steel hull made periodic degaussing absolutely necessary. I was essentially put in charge on making sure we only bought monitors that had a button for doing so.
@Roy_Tellason3 жыл бұрын
Interesting point about the wires in the LEDs being steel cored, which I don't see where anybody else picked up on. It's amazing how far that sort of thing is going. I had a rather extensive job a while back that had me picking up a whole box (1000') of RG6 coax cable, turns out that the center conductor is copper-clad steel, sticks to a magnet just fine. At the dish frequencies this stuff was carrying, skin effect made that not be a problem. Also a while back I was in a "Dollar Tree" store and saw a small package with some red and black wire. Figured that'd be handy and I picked it up. It's *not* copper, I can tell you that. So far I've used this stuff (rather extremely thin stuff) for wiring going between small modules of various sorts, and that's about it. My power distribution wiring also uses red and black, but that's tinned copper, and considerably heavier.
@BobSimpkin Жыл бұрын
Another concise video, containing everything I needed to know. Thank you Clive
@CHighShow8 жыл бұрын
This guy is awesome! i learn so much from him! *props!*
@LucyFire72 жыл бұрын
Actually, it's not about the price of the tool, it's about the knowledge of the user ! Thank you for teaching a good lesson.
@lumpyfishgravy7 жыл бұрын
I did an internship at Boxmag Rapid in Birmingham. It was a fantastic experience. Most of the products were custom in some way and a lot of the factory was essentially heavy engineering in the usual Brum style. One such product was a demagnetizer for some kind of piped material - maybe slurry. The pipe was about 6" diameter and the unit about 2' long (remember Stonehenge now). As a straight coil it took about 33A but when power factor corrected about 6A. And if you stuck a screwdriver in it, it got very hot very quick!
@leodhasach...5 жыл бұрын
Immaculate. Thanks very much Clive. Following your reassuring observations I'm going to buy one to degauss my mechanical watch.
@lepayen8 жыл бұрын
Hey Big Clive. These cheap manual degaussers are primarily for degaussing a discolored television screen, though they will work for small metal objects. They're not really good for screwdrivers but you figured that out.
@DryLog4207 жыл бұрын
Anybody else notice how he's like "it switches on the neutral, that's interesting," but he seems to make absolutely no big deal of it. I guess he must really be used to opening up "dodgy shit" as he calls it. LOL
@JoeCdaYT8 жыл бұрын
learned about the degausing from a coworker. Showed me how to de-mangnetise a screwdriver with of all things, a soldering gun. Put screwdriver shaft in between the two wires coming out of the clamping blocks and turn on gun. Then slowly pull screwdriver through and pull away until you are about 5 to 10 inches away from the gun. Works great that way.
@eatadolphin9 жыл бұрын
Oh the irony... Needing a magnetic screw-driver to remove the last screw from the degausser. :-) And that mothbally smell, thats what I refer to as the "aroma of Chinese manufacturing"... It'd be interesting to know how/why the smell. I wonder if it's from fumigating shipments at exit or entry to a country.
@LordGryllwotth9 жыл бұрын
Thank you. I was about to elaborate the same observation, but you beat me to it.
@SianaGearz9 жыл бұрын
Simon Johnson mothballs are traditionally made out of camphor. Camphor is also the oldest plasticiser for artificial plastics and was originally used with cellulose - otherwise, photographic film for example would have been impossible. The toxicity of camphor is rather low, and as long as the lethal dose is not reached, it will likely increase the Chinese worker's perceived quality of life, it works a bit like laughing gas. And it's available from cheap natural sources, they probably just grow the trees in their back yard. It is also used as a spice in cooking in numerous countries. Nah, that was just a load of bullshit. They really just need a lot of mothballs to protect the factories and storage areas from attack of the giant, nearly human-sized moths, and end up encasing some of the smell in the product. "China insect problem" gives over 3 million results on Google, so i must be onto something!
@jamesf96106 жыл бұрын
Awwwww yes the unforgettable smell of chinesium
@Graylord888 жыл бұрын
Ah, this reminds me of the crt screen days with built in demagnetisers.
@mikeyg697 жыл бұрын
DEGAUSS
@mrkitty7772 жыл бұрын
And when they had not. A simple magnet destroyed the image unless you knew it could be undone.
@billysgeo9 жыл бұрын
Great explanation of the degaussing system. Reminded of my time in college! THANKS!!!
@shevshep2 жыл бұрын
Thanks Clive I just bought one of these things and now I've seen this I am happy. Even though I had to repair the screw post which had snapped off as I couldn't be bothered to send the thing back
@kumd5 жыл бұрын
Literally was having this issue all night tonight whilst building a cheap Chinese DIY FM radio. Odd I just found this video looking through your channel. lol
@coffeeisgood1023 жыл бұрын
Thanks for taking it apart. Now I don’t need to open mine. But I’m sort of kicking myself for purchasing it because after I ordered it I played around with my Radio Shack Realistic tape head demagnetized and found out it is strong enough to demagnetized my watches. Which is my main reason for needing this tool.
@DerMarkus19824 жыл бұрын
5:43 Yes it *is* (inevitable)! Take it to bits, Clive! 😁
@SnarkasticSunny Жыл бұрын
Am learning so much today! Thanks!
@bullrun445 жыл бұрын
Thank you for the degusser class and thank you for sharing the info.
@TheEightBitLink9 жыл бұрын
For a quick hack you could add a thermistor so it would automatically degrade the field. You could also add in a switch connected to a bridge rectifier so you could get a one way electromagnet to remagnetize your tools.
@aflatminor Жыл бұрын
I recently bought one of these do demag a watch hairspring (Still in the watch!), I pressed the red button and the locknut wasn't screwed on, The button went inside and the LED indicator also went in, I contacted the seller and told him what happened and he replied 'Can you use it some more'!, I told him no because the whole lot had gone inside! I tried holding the red plastic switch first off to screw the nut on but it seemed lioke the threads were bad as that's when it went fully inside!, I opened the box up and pushed the switch through from the inside then replaced the nut whilst pushing down with pliars (And put the LED in first) and it's all working now!! 👍
@plumbandsquare18 жыл бұрын
Now that's a thorough review!
@maddoctorwhitson7 жыл бұрын
Thanks for the video. I tried that trick on one of my microwave oven transformers and it worked perfectly. Perhaps it could be done with AC step-down transformers like a 22VAC I found on the digital timer from a microwave oven, but I don't know. The transformer inside your degausser reminded me of one of those. AC step-downs are much safer, but anybody with an MOT and HV experience should try my method.
@andygozzo726 жыл бұрын
yep, remove part of the core, so the poles are 'open'...
@jerryg504 жыл бұрын
Mechanical watches are sensitive to magnetic fields, and the hairspring can become magnetized. When magnetized the watch will not keep proper time. Over time a mechanical watch hairspring can become magnetized from the Earth's field. The use of a demagnetizer for watches is able to be used to demagnetize the watch. With the use of mobile phones and computer devices mechanical watches tend to get more easily magnetized. I am using the same demagnetizer shown in this video to demagnetize my watches. It is very effective and works very well for my watches. I like electronic quartz watches for accuracy, and they are not easily affected by magnetic fields.
@575drv4 жыл бұрын
Thank you for your comment. Most times I learn from the comment section. For a deeper understanding of the magnetic field influence on rotating assemblies within the Either, I’d suggest educating oneself on “The Law of Hysteresis.” Things are not as complicated as we’ve been taught. Again, thank you.
@nand3kudasai8 жыл бұрын
i still have a samsung crt with a built in degausser working. btw awesome screwdriver (the pen shaped one)
@azzym3128 жыл бұрын
Hi Clive The degaussers ( good ones ) have a PTC and NTC thirmistors in one pact in an L circuit. Residual current in single PTC type tend to disturb the CRT. especially if multi standard and not synchronized to mains vertical drive.
@MylesNicholas8 жыл бұрын
I used an old electric shaver, with the armature removed. The vibrating armature held the blades. So basically I had a half a transformer, and placed tools or VHS tapes in the open poles. I even used it on my old TV screens too, in the early colour days.
@superidiotak8 жыл бұрын
just curious can you demagnetize a neodymium magnet?
@gladyszryan6 жыл бұрын
Yes but it is a lot more work (Heat works wonders, just get the neodymium to like, 1000C
@Limou5515 жыл бұрын
of course, in many ways. t
@Michel-7.7.73 жыл бұрын
@Schwalbe262 that was an invitation to google the stuff, he could have lie to you with "no"😁
@Michel-7.7.73 жыл бұрын
@Schwalbe262 i won't bother google that
@rwbishop8 жыл бұрын
Those old degaussing coils made for servicing CRT's (about 12" in diameter, mine is a 'CG Electronics' model 9317 but there are others) are great for general shop use. Big enough for most any & all hand tools, vise jaws or whatever comes along. Like you say, the trick is to wave the tool around within the coil, then separate to double arms length before releasing the switch. In my experience 5 seconds or so total cycle time is sufficient, and and be aware of your surroundings; if you release that switch near anything ferrous it could end up magnetized. I always remove my watch, cell phone and other electronics from the immediate area as well. The old coils work extremely well on tools and the like, but seem to have little if any effect on permanent magnets, and are poor magnetic media erasers[1]. Back in the 80's I was in the coin op video game biz; many/most of those monitors were far to cheap to incorporate integral coils, and degaussing them was a frequent chore... I hate magnetized tools, but like the flexibility of being able to magnetize whatever for some specific task and degauss once done... [1] Still don't know how the new 'chipped' credit cards will fair around said coils... I also don't know about their effect on pacemakers...
@OhShitSeriously3 жыл бұрын
I wouldn't expect a degausser to affect a chip card much. Those are just a buried microcontroller with some pads like a SIM, there's no long leads to act as an antenna. RFID cards would probably be a different matter, though; those have a long coil inside the card that the MCU both takes power off and modulates for signaling, and I bet a degausser would induce enough current to fry their tiny little brains.
@frtard9 жыл бұрын
I used to wave magnets in front of my crt monitor, just to hit the degausser function and hear that satisfying 'thunk' and watch the screen wobble... good times.
@SouthwesternEagle8 жыл бұрын
That blue is BEAUTIFUL! My 1997 Harley is that color.
@salerio619 жыл бұрын
I burst out laughing when you said "I'm going to unplug it first"
@budude29 жыл бұрын
I used to use a RadioShack degauser on my 8-track player. Man I *hate* those leads sticking to my nippers though.
@Graham_Langley9 жыл бұрын
Brian Ullmark You get the same problem with sheet metal guillotines. Cutting steel gradually magnetises the blades and cut parts eventually start sticking to them. But you need a much bigger demagnetiser/degausser than this one.
@G56AG8 жыл бұрын
I used to have a TV repair shop back in the CRT days, our techs made their own degaussing coils, I never made one but it seemed to me they were a loop of wire maybe 30-40 feet long, they usually used lamp cord, I'm not sure but they might have used a resister in line. They were usually a coil about 12" in diameter, completely wrapped in electrical tape and had an inline switch in the cord. I've degaussed many a TV picture tube in my time!
@ronplucksstrings71128 жыл бұрын
Another example of china's best...where they make this degausser on one end of a bench ...and at the other end, they make moth-balls! That momentary switch is guaranteed to last from 11 til noon...at least ten pushes! Thanks for another great video BC!
@paxmowa8 жыл бұрын
I've actually used those very buttons in all sorts of projects and I've never had one fail yet.
@bils55788 жыл бұрын
+paxmowa I've had them stick with too much amperage, over too long a time span.
@paxmowa8 жыл бұрын
+BILS yeah you're right, that degauser probably pushes a few amps through it, poor thing doesn't stand a chance.
@whitesapphire58652 жыл бұрын
I'm just imagining what you could achieve with a microwave oven transformer with its secondary removed, and with the yoke opened up at one end [to form an 'E' core]. The magnetic flux would be immense!
@Gribbo99998 жыл бұрын
Was this the same principle as used in the WW2 ship degausers used as protection from magnetic mines? I know a large cable was wrapped around the outside of and the hull wiped with the cable.
@liveepically8 жыл бұрын
Whatif you put an inline dimmer switch/pot and slowly turned it down. You could get one of those clever slider types from the home store.
@andygozzo726 жыл бұрын
nope they chop up the ac waveform, not reduce it 'linearly'..
@jamesf96106 жыл бұрын
There is linear potentiometers
@28YorkshireRose125 жыл бұрын
Or just use a variac - we know Clive has one of those...
@Graham_Langley9 жыл бұрын
Hi Clive. The thermistor arrangement used on CRT degaussing coils actually uses two thermistors. There's the PTC one in series with the coils as you describe plus an NTC one in parallel with the coils and closely thermally coupled to the PTC. With this setup the residual current through the coils once their job is done reduces to near enough zero - without the second thermistor there would always be a current through them.
@SeanBZA9 жыл бұрын
Graham Langley There are 2 wire thermistors, designed so the coil current when hot was very low. Basically now common as a polyfuse.
@Graham_Langley9 жыл бұрын
SeanBZA With a single PTC device you still have to have a current through it in order to keep it hot and high resistance, and this current would have to go through the coil. Adding a thermally-coupled NTC shunt device across the coil diverts this current and eliminates any picture disturbance.
@SeanBZA9 жыл бұрын
Graham Langley True, but they made some hyperabrupt 2 wire PTC units that when hot stayed hot with only around 10mA of current, and then in some sets they had a very high value damping resistor across the coil as well to reduce the current further. The 3 terminal ones did do a better job, but many sets only used the 2 wire arrangement, though they did go up nicely when they failed. Still would rattle like a castanet when failed.
@Graham_Langley9 жыл бұрын
SeanBZA I've not not come across those, but then I've only pulled my own TVs apart to fix and I've not had to do that for many years. Last one was a neighbour's curved widescreen Toshiba with '99 batch codes that we were taking to the dump earlier this year and that had a three-terminal PTC+NTC one.
@TheOriginalEviltech9 жыл бұрын
Graham Langley My monitor had one connected with a relay and sensing circuit to completely disconnect the PTC/coil assembly when the current dropped enough.
@TheThemrnizmo9 жыл бұрын
This is the coolest thing i have ever seen!!
@aahill269 жыл бұрын
I really like your videos :) Thanks for making them
@lion-face98047 жыл бұрын
I use a handheld version of this for degaussing tape machines. It doesn't have a switch so it's always on when plugged in. Covered in warning labels about not leaving it plugged in. It was somewhat scary getting used to it at first as it vibrates slightly and gets warm in your hand. It can take some time to properly demagnetize a large tape machine (sometimes multiple machines) and I'm always worried about leaving it on for too long. Any idea how long too long would actually be?
@jamesf96106 жыл бұрын
I would say no more than a couple minutes definitely after you start to feel it heating up. Also you could always put an on/off switch yourself.
@DanPitrello8 жыл бұрын
You've given me an idea for using a micro-controller to slowly lower the voltage to the coil, so that all one would have to do is press the button, and wait for the LED to go out, and eliminate the need to slowly pull the tool out of the field. Hmmmm....
@properfpv716011 ай бұрын
A running a/c fan motor will do it. Even a small one like a computer fan can demagnetize a watch for example.
@paullelys1612 жыл бұрын
I bought a degausser many years ago(late 70's) to degauss my tape recorder heads. Even though it came with basic instructions I never could work out how or if it really worked or caused damage to the machine. Still have it. I'll try to demagnetize a screwdriver.
@billysgeo9 жыл бұрын
And this degausser should work to demagnetize an old CRT, right?
@user-gx6jb6wc5g9 жыл бұрын
BIll Georgoulakis It's not really designed for that. Traditionally you'd use a degaussing wand and wave it gently back and forth in front of the screen, passing wide at each side. This unit might work, but is not intended to be operated for long periods of time.
@zh848 жыл бұрын
+bigclivedotcom I remember in the days when TVs were rented rather than bought a technician coming and doing exactly that to our set. He warned me in advance that what he was doing might look like casting a magic spell, but it was perfectly sensible. In fact I had studied enough physics to understand what he was about.
@billysgeo8 жыл бұрын
+bigclivedotcom Yeah, I understand that limitation. Thanks!!!
@TheChipmunk20089 жыл бұрын
My first use of a degausser was an electricity meter potential coil, potted in polyethylene... That's also where i learned that when you remove the core(tool), the coil loses the reactance, and gets really hot really fast
@dataphool7 жыл бұрын
I have often wondered, how my tools got magnetized? I have purchased new tools that displayed a magnetic field, but still wonder how that field gets more intense each year, throughout the banging and abuse they take.
@elektron2kim6664 жыл бұрын
A watch can die from being around a magnet as the hands can't pass each other (as an example) - maybe the most common issue when magnetized and newer tech try to avoid that. I just rebooted a third one from ebay. It was something I learned in the 80's with a tape deck and a shop owner looked at me odd with my desire to order a demagnetizer but I played with the heads for each tape with a screw driver and could hear the difference.
@TheChipmunk20089 жыл бұрын
LOL @ use of crt in past tense. *totally not watching this on a crt*
@user-gx6jb6wc5g9 жыл бұрын
***** Yeah, it took a while to get rid of one of the last Vacuum tubes still in use, but then it was a very sudden switch to LCD panels. Although... One of my video games has a vector display, and it totally kicks LCD ass.
@TheChipmunk20089 жыл бұрын
bigclivedotcom We utterly don't need a video about this video game...
@TheChipmunk20089 жыл бұрын
***** (invert that, i need that video lol)
@user-gx6jb6wc5g9 жыл бұрын
***** It's Atari Tempest. And it's undoubtedly the most troublesome of my games machines. Right now I don't have access to it, but I may well end up doing a video on some of its circuitry. But here's an interesting bit of trivia. It has a super high resolution display which it drives like an oscilloscope in full colour. But it only has 2 Kilobytes of video RAM.
@MrSlehofer9 жыл бұрын
bigclivedotcom wait last vacuum tube in use? what about magnetron in microwave ovens?
@elliotsamuel4 жыл бұрын
just used this very model to demagnetize the main spring in my automatic watch
@karvast57263 жыл бұрын
It's great because it's so cheap you don't really care if you use it once or twice and then it stays stored in the garage since you really don't have your watch magnetized very often
@fringdweller9 жыл бұрын
this will also unstick a cheap watch the seconds hand will do a full revolution in 1 second approx because of 50 hz, i made one for a market trader friend 10 years ago with two settings one strong to unstick the watch and one setting to run it for a while, also use lighter fluid for a stubborn jammed watch worked a treat still working today lol, give it a go with a cheap battery watch gr8 vids keep em comming.
@user-gx6jb6wc5g9 жыл бұрын
paul taplin I think that may actually be one of the advertised uses for this particular degausser.
@osmarmetal8 жыл бұрын
greetings from venezuela i just subscribe to your channel, really enjoy your videos keep it up :D
@propfella8 жыл бұрын
You didn't mention the other use of the degauzer Clive. That of cleaning audio and video tape. I have a quite large unit which was used in a radio station for cleaning audio from their logging tapes. Plus of course there's the long Wand used to degauze coloured cathode ray TV screens. Oh yes and a smaller unit for cleaning cassette tapes in compact and 8 track formats. I guess we shouldn't forget the small erase heads in all Tape type recorders, both audio and video. I also purchased a dumb unit from BangGood which has a plastic enclosure with a magnet sealed inside. It had holes on one side to Magnetize your screwdrivers and holes on the other side to demagnetize them. Not very good sadly, I much prefer the large audio unit for tools. Great videos mate, all the best from downunder.
@bitelaserkhalif7 жыл бұрын
propfella Also can be used to destroy HDD.
@propfella7 жыл бұрын
WOW, I never knew that, next thing you'll be telling me they also wreck floppy disks, yer right :-)
@nathanpuffenbarger54233 жыл бұрын
I bought a small brushless motor and took out the rotating bits and made my own degausser. Just plug it in and run any parts and pieces through the center hole without touching the sides and it's MUCH more effective than that little thing.
@staticfanatic63618 жыл бұрын
Just put the tool through the loop of a soldering gun (like a Weller) and it will work too. Can make a larger loop for larger tools out of a piece of house wiring copper. Of course it will take longer to do.
@thetezz00014 жыл бұрын
here in 2020 you legend
@RS-Amsterdam7 жыл бұрын
you could also heat the object above the Curie temperetaure
@PeterEdin7 жыл бұрын
Your typical aquarium air pump uses an E-Core, could maybe make one of my own.
@PeterEdin7 жыл бұрын
Thanks for that :-)
@players027 жыл бұрын
Thank you for the informative video.
@Bigrignohio8 жыл бұрын
Dual rated 110/220 with just a resistor in series with the LED? Any chance the voltage drop across the resistor being insufficient at 220 (or to great at 110)? And I hope you replaced that momentary pushbutton with something a little more suitable and on the line side vs neutral. And you have to laugh at the power cord "knot strain relief"!
@joradcliffe5657 жыл бұрын
Reminded me of demagnetizing audio casette players. Got to move the widget away very slowly for first few centimetres, but that wouldn't thrill us viewers here :)
@lookwhatidonemade.33063 жыл бұрын
Hah! Great vid as usual Clive. Love it.
@procactus91097 жыл бұрын
I don't like that switch one little bit. But you didn't measure the current/power.
@kuro680009 жыл бұрын
Thanks, another interesting video.
@Phos98 жыл бұрын
You can also use this if you have a mechanical watch and manage to magnetize it.
@Godshole8 жыл бұрын
I 'worked' at a local radio station a long time ago and walked in on one of the dj's erasing some jingle carts ( similar to 8 track cartridges with magnetic tape inside on a loop ) to do new jingles one afternoon using a unit not unlike this one. He had the whole box of carts next to the machine and was busy selecting odd ones he wanted to erase, buzzing them and putting them to one side. Language unsuitable for the female ear was used.
@regpollock94038 жыл бұрын
Maybe of interest. During second World War Briton fond German mines were exploding without being touching ship. Knowing about degaussing they wrapped heavy wire around ship to degauss ship.
@lalmuanpuiamizo7 жыл бұрын
How about modding it with PTC, there might not be a need to remove slowly and the light going dimmer might also show its finished
@andygozzo726 жыл бұрын
could do , but probably difficult to get the right ptc..degauss thermistors as used in tvs, which would be ideal, arent that easy to find,
@andygozzo726 жыл бұрын
wish i had bought a load cheap when i had the chance 20 or so years ago..d'ohh!!
@evening63115 жыл бұрын
The PTC would cost as much (or nearly as much) as the cheapo de-magnetser
@richtel3988Ай бұрын
I think it's about time shops stopped selling these. They come with an unfused 2-pin plug, so there's no determination which line goes to the switch. The (unrated) switch has a metal body which can be reached from the front panel. The uninsulated wires going to the switch and LED might make contact with the metal body of the switch leading to a shock. These are anything but double-screened and wouldn't be up to a CE mark. There are european-branded versions of the same thing which are very much better made, but unfortunately, as always, cost more.
@channelsixtysix0662 жыл бұрын
When degaussing tape heads, you would get the degausser, touch the tape head and move it away in a spiral motion.
@worddunlap7 жыл бұрын
It is also installed in battleships because all the electric stuff can magnetize the hull making them point north. Think 6 pair (all twisted in a cable, helix) of 500 mcm wire pulled around the entire hull of a destroyer. This is often what confuses dimwits into thinking the Philadelphia Experiment is reality. Degassing is common in large magnetic structures.
@paulm58739 жыл бұрын
I normally just wack screwdrivers on something, and that works pretty well for me
@BowlingCrony4 жыл бұрын
Maybe the wire had the slight magnetic field after being in contact with the magnet?
@NeilVanceNeilVance9 жыл бұрын
Great demo thank you.
@Jimjolnir4 жыл бұрын
2:22 ooooh. Maybe that's why my old tv ended up going green?
@user-gx6jb6wc5g4 жыл бұрын
That could also be red/blue gun/circuitry failure.
@ZeedijkMike5 жыл бұрын
Add an extra button with a diode in series and you have a magnitizer and de-magnitizer in one.
@furulevi6 жыл бұрын
So a permanent magnet adds the magnetic field and an electromagnet removes the magnetic field?!?
@whatsup72025 жыл бұрын
No.
@petewasere20008 жыл бұрын
i had to use one of these on my 21" crt tv back in the day , because i left a hifi speaker close by 😀😀😀😀
@nor42778 жыл бұрын
I was trying to look up some of your vlogs on some of your kit building,when the power supply kit ,I am building gave me a problem,I am sure you have Had a foil u were scolding come off,what did you do to complete to the circuit,did you make a jumper,or scratch off some more foil to make a jumper,I thought I would ask a expert.some of these Chinese kits have been a little hard no that I am older and the kits are so small. The kit I am trying to build is a LM 317 power supply, maybe it a kit you have already done,thanks for all your videos.
@37adrianporter8 жыл бұрын
Try moving the whole part sideways through the field and away slowly.
@ClickSpringReview4 жыл бұрын
I use this to demagnetise my watches works well
@frothybeast78849 жыл бұрын
Subbed, good videos, keep them up.
@SeanBZA9 жыл бұрын
Must look to see if I still have one fish tank air pump, which uses the same coil. Comes with a case as well and a cord, though I would have to put in the switch. That unit looks remarkably similar to the fish tank pump housings as well, probably made by the same factory.
@Graham_Langley9 жыл бұрын
SeanBZA Careful - without anything to complete the magnetic circuit the inductance will be a lot less and it'll get quite hot very quickly. If it's got a one-shot thermal safety cut-out embedded in the winding you'll only get one go at finding out how quickly. A core designed to go in a demagnetiser will be wound differently, although it'll still only be rated for intermittent use.
@SeanBZA9 жыл бұрын
Graham Langley It is open, with only a ferrite magnet waving in the breeze....... They did look very crispy though after a few years moving that rubber diaphragm though. not helped by them all seemingly to be made with the core cover being ordinary painters masking tape. That almost always was a few brown crumbles inside the bottom of the rubber base when you opened it, along with the black rubber crumb from the pump diaphragm falling to bits.
@Graham_Langley9 жыл бұрын
SeanBZA My baby degausser is the coil from a defunct hair trimmer. It's an E-core and drove a magnet that oscillated back and forth between the open legs of the core - there wasn't much coupling. But without it 30 seconds is as long I reckon it's safe to run it for.
@angr38193 жыл бұрын
Thank you
@JessicaFEREM Жыл бұрын
I would like to have something like this as both a magnetizer and a demagnetizer. I would magnetize some screwdrivers that need to be magnetized, I have a few of those. still can't justify the price even though it's probably not that much.