You might consider taking the PCB out of the monitor and putting it into a nice wooden box or plastic enclosure. The CRT makes the thing a little cumbersome to use and store. You can save a ton of weight and size with a new case. Great way to get a cheap power supply! Thanks for sharing and including all the safety advice. Too many people show dangerous experiments without adequate safety discussion.
Yeah, the point to this one was to do as few modifications as possible. I already have enough videos on making smaller power supplies other ways. Keeping an eye out for that announcement you have coming up. Knowing you guys, it should be interesting.
The Hi voltage would be higher if you left the anode wire from IHVT. Hooked up to CRT. Splice into the lead just before the cup hooked up to crt. The picture tube/crt is also a big capacitor providing filtered DC raising the hi voltage up. I made one of these out of a old 2001 19" TV and made a air ionizer. I made a large tube out of thick plastic with two screen grids inside the tube. My hi voltage lead and ground came from the picture tube anode lead. And crt ground passing through back cabinet to the plastic tube. I placed a 12 volt brushless computer cooling fan inside tube to move the ionized. Air out top of tube. A screen is placed at top mouth of tube for added protection of hi voltage. The tube has 3 plastic brackets to make a opening at bottom of tube to allow air to flow into tube to be ionolized. Works great ! The air has that ion. Smell like you get when you go outside during or just after a good size thunderstom.
Possibly the easiest to make powerful high voltage DC power supply - a modified PC/computer monitor. In this week's video I show how I did it and demonstrate by flying a lifter. Enjoy!
Nice But you are kinda afraid of the wrong thing; the most dangerous capacitors are on the main board. Especially the mains input filter cap after the rectifier. Remove the crt, and keep the yoke and it's a lot more compact.
Erlend Ervik Yeah, I was wondering what else would be dangerous. Is that cap still charged after you leave the monitor off for a day or so? Keep in mind that you wouldn't work on this while it's plugged in and certainly not while turned on.
Well.. sharp metall, tube exploding, capacitors.. the HV is mostly harmless in that list. Keep in mind that the CRT is a capacitor. The tube and the mainboard capacitors usually have bleeder resistors, so should be safe. (The tube won't self discharge if you remove the hv cable) As for getting a high voltage supply, I like to check if the yoke is connected to the flyback. In some high-end monitors they have seperate circuitry to avoid cross - effects. I got a 30 kV supply that way, I have cut away the non - interesting parts of the board. I got 10 meters as one piece of TV-40 flyback hv cable, neat stuff.
Daniel Lord I mention some safety tips in the video. A big precaution would be to leave it turned off and unplugged for a week or two and don't plug it in again until you've removed what you need and put the cover back on. In general, stay away from the electronics except the high voltage wire which you need. I guess the cathode ray tube (CRT) explodes when you hit it with a hammer :). Seriously, I don't know how else it would explode. When you short the HV to ground, keeping your hands away from it when you do, you get a big spark. I do all the time, even in this video at the end after it's all finished.
Make absolutely certain that you have a monitor with a ground wire on the input socket, and it is actually connected internally. Most older monitors have a floating ground, so touch any metal shielding, and you will form a path to earth ground via your body, which could potentially be 100V+.
Seriously, even the plates inside of older monitors aren't grounded? However, if you've discharged the high voltage side to ground and are not messing around inside it when its plugged in then shouldn't it be safe? Also, why would the shielding have charge on it? Not arguing, just asking.
RimstarOrg Google Hot Chassis. It is where the ground is a virtual ground, not earth ground. The potential between the chassis and true earth ground is potentially lethal.
If you keep the connection to the CRT, it acts like high voltage capacitor. This can be used for destructives tests. Each sparks dump lot more energy in the fluorescent/neonLCD or any other device you intend to destroy progressively. Mot to mention damaging cell phones or other sensitives devices.
Very nice reuse...and if the day ever came when your flat panel broke for the PC, just connect the cup to the end again and regain the monitor :) Am down to about 4 salvaged CRT's nowadays, nearly all my parts are salvaged from them. The degauss coils have a Tesla tower worth of approx 24AWG wire in them for example.
Cool, easy way to get HV. Just had the thought watching you ground the connector after turning off the power, couldn't you wire a double pole switch to use as a power switch that, when turned off, automatically grounded the HV side?
Sure. It's probably more than I'd want to do with this one since it's intended to be as minimal as possible. But I like your idea, an automatic discharge somehow when you turn it off. Thanks!
idiolore Sure, and that could be mitigated with a large value resistor. You might also need some reverse bias diode type thing as there might be some overlap in the switch. Wouldn't want HV going to ground with the power applied.
Thanks. Based on what I know the lifter takes to fly, the current is somewhere just above 250 microamps at that point. Unfortunately my analog meters don't cover that range, and I don't use digital meters when it comes to measuring current in a high voltage circuit.
What do you think would be the best way to prevent a flybacks primary coils back EMF from going back to the power supply....that is when the flybacks primary coil is not fed from center tap?
... and notice how clean it already is when I first open it! :) Actually when I first opened it, everything was brown and hairy, hairy in the sense that even the dust had dust on it. All in the interest of keeping the video to the point.
RimstarOrg good point! pretty much all monitors i've salvaged for various components have been littered with dirt/dust and that black stuff which comes from hv-stuff ionization.
You could, yes, though on my Google+ post from earlier this week when I said I was working on this (plus.google.com/116395125136223897621/posts/dpsWTgdMV3s) jon sanford mentioned that the yoke (coil around the neck of the CRT) is part of the flyback's inductance so I'm not sure how much you'd need to take out, but I'm think you could get enough. That might actually make for an interesting project. But my purpose in this video was how to do it without messing around with the components. You could also make them from scratch. I give some links in the video description to my other videos where I show how.
That's why I showed the danger signs and safety procedures. I totally agree. When I work with high voltage, I treat it as if I'm passing a sleeping dragon or walking on a cliff edge - with lot's or respect, caution and forethought.
HI!!! my friend and i just built one!! super excited. i'm wondering now about it's lifetime and usage. Do you have any pointers here? we built it for a science fair but are worried we are going to "burnt it out"? and. what would that look like?
Jody Coakley I've never used one for extended periods of time though I was careless with one a long time ago and didn't use the resistors that I talk about at 3:41 in the video. The power supply simply stopped producing any voltage after a big spark at the lifter. In general, avoid producing sparks, unless they're very tiny. The high current from a spark is what can damage these and is what the resistor helps protect against.Be very careful with high voltage. Always turn off and discharge the power supply and the device you're powering before going near either. At a science fair make sure people can't try touching these things while charged.Also, lifters produce a lot of ozone so use in a ventilated area. Science fairs are usually held in big halls with doors open and lots of air flow so that's probably okay.
Hmmm, I may have done some damage with the initial testing...I made a 3 inch arc with the grounding stick ( loaded with the same power of resistor you mention) . The clicking sound was quite fast on that first test, but now it's quite slow. Still produced some corona on the lifter though:-)
Jody Coakley As you guessed, that clicking sound is an indication of something bad. These monitor power supplies don't handle arcs very well. I don't know exactly what the clicking sound is though. I'd guess a relay but I don't know if there are any in the circuit. The other possibility is a tiny arc somewhere in the circuit where something has broken down, could be in a capacitor or between windings on a coil. 3 inch arcs are pretty big for this power supply to handle. When such an arc occurs with this power source there can be a lot of current in it. I have tips on rimstar.org/sdprop/lifter/lifter.htm for getting a lifter to fly. Hopefully you still can. I know sparks and arcs are neat for demonstrations but this isn't the power supply for that.
Daring act! I am sure you could solve my problem. I want to discharge 6kv cap in defib,when I calculated 2M,18watt resistor is required but this resistor is not available anywhere. What will be alternatives.
How many amps are coming out? Voltage will hurt you, but amperage will kill you... I think... anyway, is there a way to splice the red wire and keep it connected to the monitor? Just curious. I used to have a few of these monitors handy, then my dad was cleaning and he threw two away, so now I have one... but we dont use it, sooo, idk. Isnt it a little bulky just to.use its power inverter thing? I know I sound like I dont know what im talking about, but I can see it in my head, I just forget the terminology at the moment... im tired is all...
I don't have analog meters to measure the current in the range that it's in (I don't measure current in high voltage circuit with DMMs anymore. Tends to damage them.) But I did lifter current measurements in my "Lifter Voltage/Current and Smoke/Airflow Test Measurements" video and it was somewhere just above 250 microamps. And yes, it's bulky but it's easy to do if you do it safely. I have other videos showing how to make smaller units.
Brandon Fisher As far as I know, only cathode ray tube monitors since they require the high voltage for making the tube work. I'm pretty sure the thin, flat modern computer monitor in front of me doesn't have any flyback transformer (which is what makes it work in the CRT monitor.) Maybe there's other useful stuff, but not that.
(never tried this dont know if it will work) older lcds had inverters with high voltage for the mercury lamp. You could try this with a 2000-2005 LCD monitor.
What kind of CRT are you using? I can't imagine a PC monitor with no ground. I hesitate in advising since I don't know anything about you're CRT and this can be dangerous. I'd say the neutral wire can be used instead of the ground, as some have pointed out I think on hackaday.com in response to this video, but again, I don't know anything about your CRT so insert disclaimer, do at your own risk.
I really like your videos that you make for us to watch on youtube! In theory if one was to ground their rf ac through the earth ground running into the wall, shouldn't people be worried that on a positive cycle from rf grounding, its going to strike 0v somewhere inside of their wall? Maybe this can set your house on fire?! Am I wrong for that being of a concern to me?
nice "compact" psu :D why not just use flyback outside monitor with 555 driver or zvs ? its actually easy to make and you will get much more power output :)
Tiny, isn't it :D I have other power supplies starting with just the flyback, "How to Make 30kV High Voltage DC Power Supply with Flyback & Cockcroft-Walton Multiplier Tripler" and "The Cube - How to Make High Voltage Power Supply w Flyback/Builtin Diodes", but for this video I wanted to make the PC monitor one just to add to the possibilies.
There may or may not be a tripler in there. It may all be attached to the flyback, like in my recent Cube power supply video. Make sure you leave the monitor off a few days before you open it, and to be extra paranoid possibly even discharge it to ground like you saw me do in this video. The tripler and/or flyback stuff is on the other end of that high voltage wire.
You can make a lot of small, weak sparks with it as long as you use around 240 kilohms, 2 watt resistors like I show in the video. From my experience with a previous monitor it can't handle too many strong sparks in a row without dying. I didn't check what component in that monitor died though. It wasn't a fuse. Monitors just are designed to handle the current from sparks.
RimstarOrg so the best idea is to take flyback transformer out make driver (or few of these sets) put anything under oil and do it that way? I can have a lot of CRT tvs or monitors... and i dont have MOT's... They are only high current :/ I ask because i domt have and SERIOUS high voltage :/ i need some for fun ^^ hmm is there anything usefull in tv/monitor witch i can take as set? (i desolder anything i see that could be usefull)
mattibboss Yes, taking out the flyback and starting from there would work. I haven't taken apart a monitor since I've always used the monitor as is, so I don't know what other parts you can salvage. If you don't have MOTs then there's always power transistors like the 2N3055 which you can buy online or in electronics stores.
I am so perturbed at "safety" circuits on more modern CRT Flyback boards. Disconnected from the crt they turn on then click click click and right back off - Safety mode. All my research is pointing to X-Ray protect but I've gotten nowhere on disabling this feature.
There may be a way to satisfy it, if you can figure out what it's looking for. I don't know what that is but in case you hadn't thought of looking, I thought I'd mention it. If anyone else here knows then please speak up.
@@RimstarOrg Thanks RimstarOrg. Yeah I can't get a flyback board to work detached from a crt anymore :(. All the literature says its a pin on the bottom of flyback that if goes over 12 volts (High Voltage Detect/X-Ray protect mode) it feeds to pin 2 on the integrated circuit and shuts it down until being unplugged.
Aren Leishman I don't think so. You'd have to change the direction of the diodes that are built into the flyback transformer unit, which may be hard to do if they're encased in epoxy. But if they aren't encased in epoxy then you can reverse them. It'd be easy to do with this other power supply of mine (ua-cam.com/video/GEuK1OdYxHk/v-deo.html) because the flyback has no built-in diodes. Instead it goes to a tripler (a Cockcroft-Walton voltage multiplier with 3 stages) which is made to put out positive high voltage. So replace that tripler with a homemade Cockrcoft-Walton voltage multiplier that puts out negative high voltage instead or replace it with some high voltage diodes (though the output voltage will be lower than with a multiplier.) I do that on my webpage here with a similiar power supply rimstar.org/equip/negative_voltage_multiplier.htm.
+Aren Leishman Only a specially made flyback would do negative voltage. Worthy a try to negotiate with the manufacturers. I know, since I already have a pair (negative and positive)
Hi! Rimstarorg i' m theo fr.pa. Q.how do i hookup Hitachi camcorder digital to my Sanyo old picture tube analogTV more I have A/V & 3 prong coaixl cable?
Christopher Teale To make a high voltage power supply with small modifications to the TV like I do in this video with a computer monitor, yes you can, but I've never done it and don't know the steps. Be careful, it can be dangerous opening those up.However, my cube power supply was made by taking the flyback with its builtin diodes out from an old TV and starting from there as shown in my video here ua-cam.com/video/-KFhBVfpfDwB/v-deo.htmlut, if you want to use a power supply like my cube for powering a lifter, I couldn't get it to lift off. After a few tries I just burned one of the legs of the lifter as you can see here plus.google.com/116395125136223897621/posts/4MeNfcWoACN
Can you please tell me . We dont have earth ground wires where i live can you please tell me where to take the negative or where to connect it other then earth ground wire
High voltage isn't safe if you don't have an Earth ground. I'd recommend making one, perhaps by connecting a wire to a large metal sheet or a thick copper rod a few feet long and burying the sheet or rod in the ground, preferably not dry sand.
@@RimstarOrg i did it it took me 3 meter long wire and astainless sheet .now i got a new problem ... it all works well but the screen protection tuens off after few minuts of not receiving signal any suggestions please .???
I don't have a solution for that. That's why I made sure mine didn't have the protection first, though if it takes a few minutes then I can see why you didn't know it would do that. Unless you find a solution elsewhere, you'll have to use it for only a few minutes at a time. I never use mine for more than a minute at a time.
vijay ram sri ram I don't know exactly what will happen but I do know that this is a dangerous power supply. Stay away from its output and discharge anything that you've charged before you go near it.
Someone had thrown it out as garbage - so I got lucky. You could try see if you have freecycle group near you www.freecycle.org/ and ask for one there. I got a drill motor from a drill for my BB-8 droid that way.
Darwin awards for everyone. Darwin award for you, and for you, and for you. Everyone gets a darwin award (if they try this). I think it's irresponsible to teach people how to dick around with things like this. These things are deadly for those who don't know what they're doing.
If you're asking what my background is, I've been a computer programmer, teacher and solar contractor. Science and electronics have been lifelong interests but other than high school and a few side classes in university I get it all from self-learning and doing.
+RimstarOrg I am trying to find some source for Tesla coil.How can I use this.? Can I use that ground wire(you connected to the chassis) like second wire of power supply.?
+Milan Brkic These PC monitor power supplies don't seem to be able to handle very long sparks without breaking. The Tesla coil's spark is pretty short so it might work. Other than that, I don't see any reason why it wouldn't. And yes, you can use that ground wire as the second wire of the power supply.
*_Hhhhhm ... whodunit this DC High Voltage power supply burn out after only a week ? The horizontal deflection transistor really isn't made to power the flyback like this , I know for a fact that using CRT TV in this way kill the horizontal deflection transistor for a week at best_*
Sweet setup Steve! 24,000 DC for free? I've got an idea for that!
Thanks Grant! Make sure you safely discharge it to ground after each use. Looking forward to seeing whatever awesome thing you come up with!
You might consider taking the PCB out of the monitor and putting it into a nice wooden box or plastic enclosure. The CRT makes the thing a little cumbersome to use and store. You can save a ton of weight and size with a new case.
Great way to get a cheap power supply! Thanks for sharing and including all the safety advice. Too many people show dangerous experiments without adequate safety discussion.
Yeah, the point to this one was to do as few modifications as possible. I already have enough videos on making smaller power supplies other ways.
Keeping an eye out for that announcement you have coming up. Knowing you guys, it should be interesting.
The Hi voltage would be higher if you left the anode wire from IHVT. Hooked up to CRT. Splice into the lead just before the cup hooked up to crt. The picture tube/crt is also a big capacitor providing filtered DC raising the hi voltage up. I made one of these out of a old 2001 19" TV and made a air ionizer. I made a large tube out of thick plastic with two screen grids inside the tube. My hi voltage lead and ground came from the picture tube anode lead. And crt ground passing through back cabinet to the plastic tube. I placed a 12 volt brushless computer cooling fan inside tube to move the ionized. Air out top of tube. A screen is placed at top mouth of tube for added protection of hi voltage. The tube has 3 plastic brackets to make a opening at bottom of tube to allow air to flow into tube to be ionolized. Works great ! The air has that ion. Smell like you get when you go outside during or just after a good size thunderstom.
Is this not already filtered?
I need a constant DC high voltage supply.
I am absolutely amazed at how many cool things you come up with! Way to go!!
Love the lifter Steve! That is way cool, and the corona is awesome too! Nicely done :)
-Ritchie
Thanks Ritchie! Lifters are pretty cool to toy around with. Glad you like it.-Steve
Possibly the easiest to make powerful high voltage DC power supply - a modified PC/computer monitor. In this week's video I show how I did it and demonstrate by flying a lifter. Enjoy!
Nice
But you are kinda afraid of the wrong thing; the most dangerous capacitors are on the main board. Especially the mains input filter cap after the rectifier. Remove the crt, and keep the yoke and it's a lot more compact.
Erlend Ervik
Yeah, I was wondering what else would be dangerous. Is that cap still charged after you leave the monitor off for a day or so? Keep in mind that you wouldn't work on this while it's plugged in and certainly not while turned on.
Well.. sharp metall, tube exploding, capacitors.. the HV is mostly harmless in that list. Keep in mind that the CRT is a capacitor.
The tube and the mainboard capacitors usually have bleeder resistors, so should be safe.
(The tube won't self discharge if you remove the hv cable)
As for getting a high voltage supply, I like to check if the yoke is connected to the flyback. In some high-end monitors they have seperate circuitry to avoid cross - effects. I got a 30 kV supply that way, I have cut away the non - interesting parts of the board.
I got 10 meters as one piece of TV-40 flyback hv cable, neat stuff.
plz tell how to make a jacobs ladder from this high voltage supply
Daniel Lord
I mention some safety tips in the video. A big precaution would be to leave it turned off and unplugged for a week or two and don't plug it in again until you've removed what you need and put the cover back on. In general, stay away from the electronics except the high voltage wire which you need.
I guess the cathode ray tube (CRT) explodes when you hit it with a hammer :). Seriously, I don't know how else it would explode.
When you short the HV to ground, keeping your hands away from it when you do, you get a big spark. I do all the time, even in this video at the end after it's all finished.
I was wondering what to do with my old monitor. Great idea, thank you :)
Make absolutely certain that you have a monitor with a ground wire on the input socket, and it is actually connected internally. Most older monitors have a floating ground, so touch any metal shielding, and you will form a path to earth ground via your body, which could potentially be 100V+.
Seriously, even the plates inside of older monitors aren't grounded? However, if you've discharged the high voltage side to ground and are not messing around inside it when its plugged in then shouldn't it be safe? Also, why would the shielding have charge on it? Not arguing, just asking.
RimstarOrg Google Hot Chassis. It is where the ground is a virtual ground, not earth ground. The potential between the chassis and true earth ground is potentially lethal.
If you keep the connection to the CRT, it acts like high voltage capacitor. This can be used for destructives tests. Each sparks dump lot more energy in the fluorescent/neonLCD or any other device you intend to destroy progressively.
Mot to mention damaging cell phones or other sensitives devices.
Very nice reuse...and if the day ever came when your flat panel broke for the PC, just connect the cup to the end again and regain the monitor :)
Am down to about 4 salvaged CRT's nowadays, nearly all my parts are salvaged from them. The degauss coils have a Tesla tower worth of approx 24AWG wire in them for example.
Thanks. Good to know regarding the Tesla tower wire. One of these days I'm going to make one.
Great tutorial Steve! I'm sure this video will inspire many people. :)
Thanks! Hopefully the people it inspires do it safely. :)
You can also get 300v or so from the supply on an LCD monitor as long as it uses CCFLs for backlighting.
Makes sense, given that the FLs (fluorescent lights for anyone else reading this) would need HV. Thanks for the tip.
I've done this with a television. Great video by the way !
Thanks! And that's good to know. I get asked a lot if that's possible.
Ok, thanks for the reply.
Cool, easy way to get HV. Just had the thought watching you ground the connector after turning off the power, couldn't you wire a double pole switch to use as a power switch that, when turned off, automatically grounded the HV side?
Sure. It's probably more than I'd want to do with this one since it's intended to be as minimal as possible. But I like your idea, an automatic discharge somehow when you turn it off. Thanks!
You would get HV arcing across to ground across the small gap.
idiolore Sure, and that could be mitigated with a large value resistor. You might also need some reverse bias diode type thing as there might be some overlap in the switch. Wouldn't want HV going to ground with the power applied.
Nice video. Helpful.
Is this pure dc ( filtered) or just rectified dc?
Thanks.
It's pure DC but with a little ripple on top.
And thanks. I'm glad you found it helpful.
You are gonna get me killed dude ( I think i'll resist trying this one :P)
I'm making it too easy am I? :)
Great tutorial, as always! I'm wondering how many amps your monitor/power supply can deliver.
Thanks. Based on what I know the lifter takes to fly, the current is somewhere just above 250 microamps at that point. Unfortunately my analog meters don't cover that range, and I don't use digital meters when it comes to measuring current in a high voltage circuit.
What do you think would be the best way to prevent a flybacks primary coils back EMF from going back to the power supply....that is when the flybacks primary coil is not fed from center tap?
you make opening that monitor look so easy....
... and notice how clean it already is when I first open it! :) Actually when I first opened it, everything was brown and hairy, hairy in the sense that even the dust had dust on it. All in the interest of keeping the video to the point.
RimstarOrg good point! pretty much all monitors i've salvaged for various components have been littered with dirt/dust and that black stuff which comes from hv-stuff ionization.
But you could also remove the most stuff and build all the vital components into a box right? so you don't have to have the monitor itself?
You could, yes, though on my Google+ post from earlier this week when I said I was working on this (plus.google.com/116395125136223897621/posts/dpsWTgdMV3s) jon sanford mentioned that the yoke (coil around the neck of the CRT) is part of the flyback's inductance so I'm not sure how much you'd need to take out, but I'm think you could get enough. That might actually make for an interesting project. But my purpose in this video was how to do it without messing around with the components. You could also make them from scratch. I give some links in the video description to my other videos where I show how.
yep.
why not build a simple voltage doubler circuit like they do with ion guns? or do they not carry enough current?
pretty cool. id like to see how to make a power inverted to convert 12 to 220, i dont know if you could use an old monitor for that
Thanks. Inverters seem to be a popular request. Sadly I have no experience in that area.
im sure you have more experience than me.
Worth a warning to people that this could be the last project they ever do if they get it wrong. Old TVs and CRTs can be very dangerous.
That's why I showed the danger signs and safety procedures. I totally agree. When I work with high voltage, I treat it as if I'm passing a sleeping dragon or walking on a cliff edge - with lot's or respect, caution and forethought.
HI!!!
my friend and i just built one!! super excited. i'm wondering now about it's lifetime and usage. Do you have any pointers here? we built it for a science fair but are worried we are going to "burnt it out"? and. what would that look like?
Jody Coakley I've never used one for extended periods of time though I was careless with one a long time ago and didn't use the resistors that I talk about at 3:41 in the video. The power supply simply stopped producing any voltage after a big spark at the lifter. In general, avoid producing sparks, unless they're very tiny. The high current from a spark is what can damage these and is what the resistor helps protect against.Be very careful with high voltage. Always turn off and discharge the power supply and the device you're powering before going near either. At a science fair make sure people can't try touching these things while charged.Also, lifters produce a lot of ozone so use in a ventilated area. Science fairs are usually held in big halls with doors open and lots of air flow so that's probably okay.
Hmmm, I may have done some damage with the initial testing...I made a 3 inch arc with the grounding stick ( loaded with the same power of resistor you mention) . The clicking sound was quite fast on that first test, but now it's quite slow.
Still produced some corona on the lifter though:-)
Jody Coakley
As you guessed, that clicking sound is an indication of something bad. These monitor power supplies don't handle arcs very well. I don't know exactly what the clicking sound is though. I'd guess a relay but I don't know if there are any in the circuit. The other possibility is a tiny arc somewhere in the circuit where something has broken down, could be in a capacitor or between windings on a coil. 3 inch arcs are pretty big for this power supply to handle. When such an arc occurs with this power source there can be a lot of current in it.
I have tips on rimstar.org/sdprop/lifter/lifter.htm for getting a lifter to fly. Hopefully you still can. I know sparks and arcs are neat for demonstrations but this isn't the power supply for that.
Daring act! I am sure you could solve my problem. I want to discharge 6kv cap in defib,when I calculated 2M,18watt resistor is required but this resistor is not available anywhere. What will be alternatives.
How many amps are coming out? Voltage will hurt you, but amperage will kill you... I think... anyway, is there a way to splice the red wire and keep it connected to the monitor? Just curious. I used to have a few of these monitors handy, then my dad was cleaning and he threw two away, so now I have one... but we dont use it, sooo, idk. Isnt it a little bulky just to.use its power inverter thing? I know I sound like I dont know what im talking about, but I can see it in my head, I just forget the terminology at the moment... im tired is all...
I don't have analog meters to measure the current in the range that it's in (I don't measure current in high voltage circuit with DMMs anymore. Tends to damage them.) But I did lifter current measurements in my "Lifter Voltage/Current and Smoke/Airflow Test Measurements" video and it was somewhere just above 250 microamps. And yes, it's bulky but it's easy to do if you do it safely. I have other videos showing how to make smaller units.
Can this work with your electrostatic precipitator?
Yes. I didn't try it but because this monitor power supply is basically the same as the 30kV power supply that I did use I think it would work.
Out of curiousity, would this work for modern computer monitors you know the less bulky ones or only the cathode ray monitors?
Brandon Fisher As far as I know, only cathode ray tube monitors since they require the high voltage for making the tube work. I'm pretty sure the thin, flat modern computer monitor in front of me doesn't have any flyback transformer (which is what makes it work in the CRT monitor.) Maybe there's other useful stuff, but not that.
(never tried this dont know if it will work) older lcds had inverters with high voltage for the mercury lamp. You could try this with a 2000-2005 LCD monitor.
As always, great video
What should be done for ground if the CRT doesn't have a three prong cord and there are no apparent grounded plates?
What kind of CRT are you using? I can't imagine a PC monitor with no ground. I hesitate in advising since I don't know anything about you're CRT and this can be dangerous. I'd say the neutral wire can be used instead of the ground, as some have pointed out I think on hackaday.com in response to this video, but again, I don't know anything about your CRT so insert disclaimer, do at your own risk.
I really like your videos that you make for us to watch on youtube! In theory if one was to ground their rf ac through the earth ground running into the wall, shouldn't people be worried that on a positive cycle from rf grounding, its going to strike 0v somewhere inside of their wall? Maybe this can set your house on fire?! Am I wrong for that being of a concern to me?
Tesla Explorer It's a danger if the current is too high for the wires, but the breakers or fuses should take care of that.
Will this function as a Jacobs ladder?
I'll give it a try and let you know. Somehow I suspect there won't be enough current for a Jacobs ladder.
Is the HV pulsed or steady? Can you also do the same with a small CRT television?
The HV is steady DC. I haven't done it myself, but I'm told you can do it with a small CRT TV.
nice "compact" psu :D
why not just use flyback outside monitor with 555 driver or zvs ? its actually easy to make and you will get much more power output :)
Tiny, isn't it :D
I have other power supplies starting with just the flyback, "How to Make 30kV High Voltage DC Power Supply with Flyback & Cockcroft-Walton Multiplier Tripler" and "The Cube - How to Make High Voltage Power Supply w Flyback/Builtin Diodes", but for this video I wanted to make the PC monitor one just to add to the possibilies.
trying to find that voltage tripler was very hard. Good thing I didn't throw out my old computer
There may or may not be a tripler in there. It may all be attached to the flyback, like in my recent Cube power supply video. Make sure you leave the monitor off a few days before you open it, and to be extra paranoid possibly even discharge it to ground like you saw me do in this video. The tripler and/or flyback stuff is on the other end of that high voltage wire.
Can i use it to just make random hv sparks? Or will it burn out or fuse will blow or something else dies?
You can make a lot of small, weak sparks with it as long as you use around 240 kilohms, 2 watt resistors like I show in the video. From my experience with a previous monitor it can't handle too many strong sparks in a row without dying. I didn't check what component in that monitor died though. It wasn't a fuse. Monitors just are designed to handle the current from sparks.
RimstarOrg so the best idea is to take flyback transformer out make driver (or few of these sets) put anything under oil and do it that way? I can have a lot of CRT tvs or monitors... and i dont have MOT's... They are only high current :/
I ask because i domt have and SERIOUS high voltage :/ i need some for fun ^^ hmm is there anything usefull in tv/monitor witch i can take as set? (i desolder anything i see that could be usefull)
mattibboss
Yes, taking out the flyback and starting from there would work. I haven't taken apart a monitor since I've always used the monitor as is, so I don't know what other parts you can salvage. If you don't have MOTs then there's always power transistors like the 2N3055 which you can buy online or in electronics stores.
What are the actual uses of this psu? I'm wondering since i've got one of those monitors collecting dust too
Ramses De Vuyst The only uses I know of are fun thing like I show in this video, flying a lifter.
I am so perturbed at "safety" circuits on more modern CRT Flyback boards. Disconnected from the crt they turn on then click click click and right back off - Safety mode. All my research is pointing to X-Ray protect but I've gotten nowhere on disabling this feature.
There may be a way to satisfy it, if you can figure out what it's looking for. I don't know what that is but in case you hadn't thought of looking, I thought I'd mention it. If anyone else here knows then please speak up.
@@RimstarOrg Thanks RimstarOrg. Yeah I can't get a flyback board to work detached from a crt anymore :(. All the literature says its a pin on the bottom of flyback that if goes over 12 volts (High Voltage Detect/X-Ray protect mode) it feeds to pin 2 on the integrated circuit and shuts it down until being unplugged.
Could this output a negative voltage?
Aren Leishman I don't think so. You'd have to change the direction of the diodes that are built into the flyback transformer unit, which may be hard to do if they're encased in epoxy. But if they aren't encased in epoxy then you can reverse them.
It'd be easy to do with this other power supply of mine (ua-cam.com/video/GEuK1OdYxHk/v-deo.html) because the flyback has no built-in diodes. Instead it goes to a tripler (a Cockcroft-Walton voltage multiplier with 3 stages) which is made to put out positive high voltage. So replace that tripler with a homemade Cockrcoft-Walton voltage multiplier that puts out negative high voltage instead or replace it with some high voltage diodes (though the output voltage will be lower than with a multiplier.) I do that on my webpage here with a similiar power supply rimstar.org/equip/negative_voltage_multiplier.htm.
+Aren Leishman Only a specially made flyback would do negative voltage. Worthy a try to negotiate with the manufacturers.
I know, since I already have a pair (negative and positive)
Hi! Rimstarorg i' m theo fr.pa. Q.how do i hookup Hitachi camcorder digital to my Sanyo old picture tube analogTV more I have A/V & 3 prong coaixl cable?
Can you use an old TV?
Christopher Teale To make a high voltage power supply with small modifications to the TV like I do in this video with a computer monitor, yes you can, but I've never done it and don't know the steps. Be careful, it can be dangerous opening those up.However, my cube power supply was made by taking the flyback with its builtin diodes out from an old TV and starting from there as shown in my video here ua-cam.com/video/-KFhBVfpfDwB/v-deo.htmlut, if you want to use a power supply like my cube for powering a lifter, I couldn't get it to lift off. After a few tries I just burned one of the legs of the lifter as you can see here plus.google.com/116395125136223897621/posts/4MeNfcWoACN
Ok. Thank you. I think Ill give it a shot
Can you please tell me . We dont have earth ground wires where i live can you please tell me where to take the negative or where to connect it other then earth ground wire
High voltage isn't safe if you don't have an Earth ground. I'd recommend making one, perhaps by connecting a wire to a large metal sheet or a thick copper rod a few feet long and burying the sheet or rod in the ground, preferably not dry sand.
@@RimstarOrg i did it it took me 3 meter long wire and astainless sheet .now i got a new problem ... it all works well but the screen protection tuens off after few minuts of not receiving signal any suggestions please .???
I don't have a solution for that. That's why I made sure mine didn't have the protection first, though if it takes a few minutes then I can see why you didn't know it would do that. Unless you find a solution elsewhere, you'll have to use it for only a few minutes at a time. I never use mine for more than a minute at a time.
Sir please tell me difference between volts ,wat,amp
if your asking this you probably should not attempt to build this. volts=potential, ampere=current, watt=unit of power
Ben P. damn I think hes dead by the time now 😫😲😂
Nice
What will happen if we touch the output current?
vijay ram sri ram I don't know exactly what will happen but I do know that this is a dangerous power supply. Stay away from its output and discharge anything that you've charged before you go near it.
Discharge all capacitors before touching anything, and still be careful as the monitor can act as a Leyden jar and carry enough charge to kill you.
Or just sonder an Electronic Ballast to the Flyback Transformer, as i done it in my Video. Would be nice in you watch it.
Good Wishes from Germany
from where you got the monitor
Someone had thrown it out as garbage - so I got lucky. You could try see if you have freecycle group near you www.freecycle.org/ and ask for one there. I got a drill motor from a drill for my BB-8 droid that way.
a Jesus stick lol you have balls ,good work
Darwin awards for everyone. Darwin award for you, and for you, and for you. Everyone gets a darwin award (if they try this).
I think it's irresponsible to teach people how to dick around with things like this. These things are deadly for those who don't know what they're doing.
This thing is like trying to save for usage a trucks engine and carrying the truck around for the purpose.
Can I power tesla coil with this?
I don't know enough about tesla coils to say. Does anyone else here know?
Hmmm, I still have a few CRTs around the office...
You could certainly spice up the office this way. :)
You really like high voltage, don't you. :)
This is to dangerous for "normal" people...
Yes. Only people experienced with working with electricity and high voltage should attempt this if they want to.
what is your job ?
If you're asking what my background is, I've been a computer programmer, teacher and solar contractor. Science and electronics have been lifelong interests but other than high school and a few side classes in university I get it all from self-learning and doing.
Is this a DC ??
+Milan Brkic Yes, high voltage, flat DC.
+RimstarOrg Thanks.!
+RimstarOrg I am trying to find some source for Tesla coil.How can I use this.? Can I use that ground wire(you connected to the chassis) like second wire of power supply.?
+Milan Brkic These PC monitor power supplies don't seem to be able to handle very long sparks without breaking. The Tesla coil's spark is pretty short so it might work. Other than that, I don't see any reason why it wouldn't. And yes, you can use that ground wire as the second wire of the power supply.
+RimstarOrg Thanks alot.!
Why don't you just simply make a ZVS driver?
Lol this is so dangerous
*_Hhhhhm ... whodunit this DC High Voltage power supply burn out after only a week ? The horizontal deflection transistor really isn't made to power the flyback like this , I know for a fact that using CRT TV in this way kill the horizontal deflection transistor for a week at best_*
never try this one. not worth the risk - just sayin'
Rob Norris I agree... unless you know what you're doing. This is definitely not for a school science project.
Thank you for this, I now know how to take a whole lot more steps than I was ever intending to to kill myself 🤣