Search for neon transformer in Topics


transformer for neon light

Hi- I have a couple of transformers for some neon lights I got at a place going out of business. I'm never going to start bending/blowing glass so if anyone else has need of the transformers (or the tubes of glass!) I'll be happy to give it away for the postage. Call if you want pictures or have questions. 813-541-2137 Terre

Topic by terrefirma  


Neon sign transformer

Hello everybody, I am looking for a Neon Sign Transformer (NST), I can not find any in my local area and cannot use ebay because I am 15 years old. So if anybody has an old used NST that you don't want anymore and willing to give it away or can obtain a NST for free from your local dump or neon sign stores, I would really want it! I will pay the postage bill. If you are curious why I wanted a NST, I want to build a Tesla Coil, I had built other Tesla Coils using other power supplies but I always have bad luck with them, they don't work properly so that is why I wanted a NST.I really don't mind how much voltage the NST gives out, like between 6Kv to 15Kv, but I do mind how much current it gives out, I only want a transformer that can give give out current between 20mA to 40mA, because of this, I don't want to build a big Tesla Coil yet...So, if you have a NST that you are willing to give away, please respond to me ONLY if you live in UK (United Kingdom), because I cannot afford such high postage (shipping) bill from other countries like America..

Topic by Plasmana    |  last reply


how to test neon transformers? Answered

I got 4 neon transformers on a dumpster dive. 2 are rated 6000v and 2 are rated 7500v. my multimeter only goes to 750v ac. i have insulated tools (im and electrician) can i just arc the output wires? if anybody is interested in them to build something cool i might be persuaded to give them to you for shipping costs.

Question by dannemillerd    |  last reply


Seeking neon light transformer

Hi all: anyone know where i can purchase a second hand neon light transformer around 8-10kv.I'm in Sth Akl. Any help would be fantastic.Thanks,Terry

Topic by tezza1    |  last reply


Electronic Neon Transformer project help

I have a neon sign transformer that i would like to use for high voltage projects.  The problem is it has an electronic safety circuit that (I believe) checks to see if there is a neon tube is attached.   Does anyone know how to bypass the safety system? the transformer box is full of insulating tar so accessing the electronics is near impossible.  930CPX120 ALLANSON 9000V 30MA NEON TRANSFORMER, 

Question by BlitzkriegBrain    |  last reply


Bypass safeties in electronic Neon Transformer

I have a neon sign transformer that i would like to use for high voltage projects. The problem is it has an electronic safety circuit that (I believe) checks to see if there is a neon tube is attached.  Does anyone know how to bypass the safety system? the transformer box is full of insulating tar so accessing the electronics is near impossible. when turned on it sends out several short HV pulses and then the warning light illuminates, it seems to be searching for some type of load. 930CPX120 ALLANSON 9000V 30MA NEON TRANSFORMER,

Question by BlitzkriegBrain    |  last reply


jacobs ladder help

I'm making a Jacobs ladder. i got the transformer but it doesn't have a plug. what should i do. i was thinking about splicing a extension cord and using it for the plug but i'm not sure if it would work. please respond.

Topic by Sun Gear    |  last reply


Neon Sign transformers, gotta go! $40 each.

These things have been sitting in my basement for quite a while; I doubt I'll ever use this many. So, I offer them for sale! I've got 9,000V ones, 7500V ones, 6,000V ones, 5,000V ones and 4,000V ones. $40 each. All are 30mA, center tapped with no sGFI, perfect for Tesla coils, Jacob's ladders, etc.

Topic by grenadier    |  last reply


Neon Sculpture HELP!!!!!

I am looking for any information about fixing a neon sculpture we purchased in 2002. You folks seem pretty technically astute so I'm hoping someone can point me in the right direction. I live on a fairly rural island, the one sign shop here told me they would fix it if I could find parts. (They tested the bulb, which is fine, so it's either the transformer or the power cord). I know that's not very do-it-yourself, but I don't know anything about neon. It broke when I ran the vacuum over the power supply cord, I remember it made a "pop" noise. Anyway, the piece is mostly metal with a small (20" long) neon bulb attached. The transformer is only about 2" long, 1/2" wide. I tried to replace the cord from radio shack, they couldn't be sure they sold me the right one, so I'm still stuck. The dc output from the old cord is 12v, 500mA. The company that manufactured it was Neon Specialties, the cord also says "Moser & Co" on it. I couldn't find anything on the Internet. Anybody have a source for replacement parts? Or any advice? The piece has a lot of sentimental value to my husband, that's why I would like to fix it. Thank you!

Topic by aprilq1111    |  last reply


Stupid Question - Neon Sign Transformer for Tesla Coil? Answered

I probably already know the answer to this question, but I'll ask it anyway. For a Tesla Coil, the NST's input power supply generally comes from a 120 V outlet, right?

Question by Umniscient    |  last reply


Can I build a Tesla Coil using a flyback transformer instead of a neon sign transformer? Answered

If yes, what changes would there be in its design from one that does use a neon sign transformer? If not, what can I do with my surplus of flyback transformers?

Question by Justin the Red    |  last reply


Ways to make an Asynchronous Spark Gap NST friendly

Are there any ways to protect your neon sign transformer(s) from the affects of an Asynchronous rotary spark gap?

Topic by OzoneLab  


wanted: how to build a dc rectifier for neon sign transformers

Please help me build a dc rectifier for a 10 kv neon sign transformer. i need it to be dc becouse im building an anti-gravity lifter and those dont work with ac

Topic by budsiskos    |  last reply


how high is the voltage in the average neon transformer? Answered

I need to know because I may be using one as my power source for my Tesla-coil. 

Question by nerd7473    |  last reply


NST in tesla coil

Hey,I was thinking of making a Tesla coil for my science fair.The fact that NST (neon sign transformer) are a bit expensive, could anyone suggest me another way for its power supply other than using it

Topic by Энтони    |  last reply


Where can I find an old/new working neon sign transformer for free? Answered

I really need a neon sign transformer for a project im doing. where can I find one? free or under $10. need help.

Question by Mudbud    |  last reply


Looking for high voltage transformer(s)

Hi! I am looking for anyone who would be willing to give me any neon sign transformers (that are not being used or are unwanted) for free. I have looked online and everyone that I have found has been way too expensive. It doesn't really matter the type, voltage, current, etc. of the transformer, I am just looking for one suitable for making a tesla coil of any size (I can adjust the design and size of the tesla coil to work well with the transformer). I would be willing to pay for shipping as long as you live in the US for I do not have very much money. Also, if you are not willing to give me or do not have a neon sign transformer, I am also looking for oil burner ignition transformers and pretty mucj any high voltage transformers that can be used for high voltage experiments/projects. If you are interested in giving me a transformer for free and are willing to pay for postage, please email me at the following email: ThatElectronicsGirl@gmail.com Otherwise, please leave a reply to this post. Whether you are willing to give me any of the transformers I asked for or not, thank you for taking the time to take a look at this post.

Topic by BeekerButts    |  last reply


Does the size\weight of an NST matter? Answered

Hi everybody, I have at work two old school iron core neon sign transformers. They are both rated at 10KV 100mA. The thing is, one of them is only 2/3 of the size and weight of the other.   Assuming they are both in good condition, would there be any difference in performance, durability, reliability or whatever between the two?   I want to build a Jacobs ladder, and was wondering which one would work best... Thanks for the help!

Question by Morgantao    |  last reply


Possible to hack a NST with sGFI?

I'm having a really hard time finding an old neon sign transformer (NST) for high voltage (HV) experiments. Almost everything on craigslist is of the newer transformer that has the secondary ground fault protection.  So is there a way to hack the new ones?  I appreciate and thank you in advance for your help.

Question by JeffB23    |  last reply


Ideas for creating a portable Tesla coil

I am in the process of planning a small-ish Tesla coil that can fit inside of a medium-sized hard shell suitcase. I would like to be able to power it without using a wall outlet, which most likely means with 6v lantern batteries or 12v lawnmower batteries, but if you have any other suggestions I'd be glad to hear them. I would prefer to keep the coil as simple as possible and maintain a spark gap configuration rather than a solid-state one because I am not very good at soldering small parts. I was thinking about using a neon transformer from a set of car under lights such as these http://www.amazing1.com/profneon.htm (is there anything there which would work especially well?) or perhaps a modified ignition coil with a mechanical interrupter, similar to a Ruhmkorff coil (I have no idea how I would do this, but it sounds like it would work). Your thoughts? Also, instructions on how to construct a flat 'pancake-style' secondary could be beneficial.

Question by Justin the Red    |  last reply


Fun withTransformers

Connect the output of 2 transformers in series...  12v  +  6 v. much as you would connect batteries in series. will it burn out?  will it produce 18 v as one would expect with batteries?......... 18 volts!!  yay!   hasnt burnt out( YET)... i wont leave this unattended. transmission of power is more efficient at high v.     sooooo... if i hook the output of a 10,000 v  neon transformer to 2 thin strands of wire( think magnet wire, or a single strand from stranded cable)   and input this  10,000 v into the secondary of a second identical neon transformer, will i get usable 120 v from the primary?  (attempt to run the second transformer in reverse as a stepdown) Nope... not YET.  Suggestions?

Topic by Toga_Dan    |  last reply


Connect transformers together in series? Answered

I've got 4 neon sign transformers, each outputting 12 000V at 30mA. I want to connect them together in series to increase the voltage to 48kV but I just wanna check on the right way of connecting them for safety reasons. The input for all transformers is the standard 220V AC.( I need such a high voltage for a fusion reactor) (the pic is one I found on google that's why the input voltage is 120)

Question by JunaidA44    |  last reply


My NST is buzzing- how do I stop it?!?!?

Hello, I am in the final steps of perfecting a Tesla Coil that I started a few months back. I only got the spark gap to fire in one test run. Every other time, the circuit does nothing, and my new 10 kv neon sign transformer buzzes loudly and ominously. I'm really worried that I'll burn it out. Why is it malfunctioning? How can I fix the problem?Update: After a little experimenting, and checking all connections, I've found that the one time that the spark gap fired happened because of a wiring error (i connected the gap in series to the transformer instead of parallel); this resulted in a spark across the gap, but no oscillation. I'm starting to think that the capacitor's are the problem. I originally believed that the required capacitance was .003 uf, but I recalculated that and found that it was actually .0079 uf. This could explain why a spark couldn't jump. I'll order some more, and see how that goes. Thank you all.

Question by ElectricUmbrella    |  last reply


I'm getting a 12kV 30mA neon sign transformer, How do I make the output variable so I can turn the power up or down?? Answered

Title says it all how do I make it so I can turn the power up or down? thanks for any help =D

Question by j.hawkins    |  last reply


9kV 50mA tesla coil NST question. Why does the circuit breaker in my home trip when i plug in my NST?

Please someone help, this is my first tesla coil project, my setup: 230VAC 50Hz input ricci 9000v 50ma NST with a built in GFI (ground fault interrupter) but i bypassed the gfi succesfully .see pics safety gap  7,5 cm diameter pvc secondary 1000 turns #24 magnetwire (0,5mm) secondary 10 turns 8mm copper pipe primary (tapped at 7 turns) saltwater capacitor 16 green beer bottles in a bucket with a capacitance of 0,0122 uF or 12,2 nF (thegeekgroup bucket cap) static spark gap 28mm diameter stainless steel spheres as electrodes with oven fan (temporary, i am building a hyperbaric gap) 10cmx27,5cm aluminum toroid topload with a brass screw as breakout point RF ground aluminum rod 1,2 meter  When i tested the coil for the first time the spark gap was set on 6mm and i got 20cm or 8inch streamers without breakout point but the gfi on my nst tripped after a few seconds. i didn't know there was a built in gfi on my nst so i fooled around with my spark gap and safety gap and the tapping point on the primary hoping to get better performance. after a few runs the gfi started to trip very fast and i could only run the coil with the spark gap set on max 2mm, any bigger then that would trip the gfi on the nst. so i found out that it had a gfi and i bypassed it with thick wire. Then when i ran the nst i got the exact same thing but with my circuit breaker in my home. i have made a video on youtube that shows the problem here is the link: (please help) http://www.youtube.com/watch?v=piH44ohowyE please anyone help me! Any help or suggestion is very welkom!

Question by colinbarnes    |  last reply



What can someone do with a CRT flyback transformer?

I recently just finished desoldering components from a CRT TV's circuit boards and I got the flyback transformer. What can I do with this flyback transformer? Can I make an ozone generator out of it? I've seen how to make an ozone generator using a neon sign transformer but those are expensive. Maybe I can use a flyback transformer to make the high voltages instead?

Question by poiihy    |  last reply


Small tesla coil? Answered

5000volt neon transformer too many capacitors? Should I just wait tell I can make bigger coil

Question by wiccakingkamui    |  last reply


Testing a NST with a DMM?

I have been looking for a good (and cheap) NST for a while but i dont want to risk spending too much on a NST that doesnt work. I know that my local scrap yard has a large supply of old NSTs that are either there because both or one side doesnt work, they were upgraded, or someone needed the money and/or space. i also know that they would frown upon me wiring each one up and testing each. so onto the real question: is there a way to test a NST with just a multimeter and possibly a battery (i know thats how some people test for flyback transformer pins) or if checking continuity would be enough or even another way? Just so everyone knows i have spent quite a while searching for someone using this technique but didnt find anything, also im looking for a way to know for sure if one or both sides are working.

Question by pmk222    |  last reply


What's the proper transformer for a mini tesla coil with no nst? Answered

The wire I had for the secondary coil coolness 65 feet and the primary is vertically wound around the secondary I think a neon sign trans is to high voltage maybe if I build the right cap it'll work or do you think I should do.d a smaller one. And I want it to wirelesslypower a fluorescent light also if without the best can I build the receiver take its energy useable for more electronocs

Question by wiccakingkamui    |  last reply


EL Wire Troubleshooting

Hey everyone, I use EL Wires to make small neon signs and I've never had any problems with them until I started shipping them places. I have no idea how to fix these things and one of my customers told me the wire is detached from the transformer. Is this fixable?

Topic by kaybee71    |  last reply


how to convert High Voltage DC into AC without changing Voltage? DO CAPACITORS WORK ON HIGH FREQUENCY CURRENT? Answered

I want to build a Spark Gap Tesla Coil but the problem is that I am unable to find a neon sign transformer locally. so i decided to a voltage multiplier. But its output is DC which means that Capacitors (most probably) not work. so please can you tell me how to convert dc to ac without changing its voltage. ALSO, I was wondering whether a capacitor will work with high frequency flyback transformers or not. ????????????????????????????????

Question by SHREYANSH_HV    |  last reply


I got a NST!

I recently bought a 11kv, 30mA Neon Sign transformer. I can get nice arcs off of it and everything (maybe about 2 inches? when rectified it makes shorter high pitch arcs), but I'm wondering about protecting it. after a couple hours of playing with it there was a loud pop in the case and it stopped working. I opened it up (it was held together by rivets, I just drilled the rivets out) and it's a switched mode neon sign transformer. I thought it was a bit light! So I found a (transistor? To-220 case) that had it's face blown off, luckily I found the other piece and I'm going to order the component and replace it. So, is there a cheap easy way of preventing this happening? While opening the case I added a number of saftey features, a saftey switch, and a "ON" indicator.

Topic by guyfrom7up    |  last reply


How could I make an igniter for a waste oil furnace/foundry?

I am making a waste oil furnace/foundry and don't want to have to use charcoal to ignite it everytime, so I am thinking of buying a 15000 volt neon sign transformer and using nails or tungsten TIG electrodes to ignite it. Would this work? I can't find any places near me which sell tungsten TIG electrodes? I was worried about using nails because I think they might melt from the tempature of the flame. Is that true?

Question by snowluck2345    |  last reply


PFC for home use

I'm thinking about using PFCs (power factor correction capacitors) for my whole house. Has anyone here done it? I currently use PFCs on my neon sign transformer (an d it works), but I have a question. Why wouldn't one capacitor effect my whole house? or does it and it's just because it's a tiny cap (only about 20uF) that the results are negilagble? Also, what stops it from just affecting my house to the whole power grid? thankyou EDIT: I just read somewhere that the power company for residential homes charges the same whether you use PFCs or not, they just somehow mesure the real power... Is that true?

Topic by guyfrom7up    |  last reply


"Shunt" diodes with resistors? Answered

I'm making diode bridges to have a nice supply of DC. I'm making a high voltage bridge for a 7.5kv nst and a low voltage bridge for regular 120v wall outlet . My high voltage bridge im going to make with several 1N4007 but i read that they should be "shunted" with 10Mohm resistors im not sure what is meant by this. Does it mean resistor, diode, resistor, diode or does it mean diode and resistor, diode and resistor. The pic says it better than i do.  Also, do i need resistors for a bridge for 120v bridge?, im going to use the diodes from a fluorescent light power supply.

Question by jaydenr    |  last reply


Why isn't my medium spark gap Tesla coil working? Answered

I am building a medium Tesla coil. I have checked all the parts of it and I cant find out why it isn't working.  The hv transformer is a 12kv neon sign transformer. There is a gfci but it isn't tripping. For a spark gap, I'm using a single spark gap made of copper. I have tried putting them at various lengths away, but they still don't fire. The capacitors have a total capacitance of 14.1nF and are rated at 15kv. They are ceramic capacitors and current is flowing through them. The primary coil is 0.25 in copper tubing held with 0.25 inches between the windings, of which there are 7.5. I have tried using 1-7.5 turns, and that didn't make a difference. My secondary coil consists of 2032 turns of 32 awg wire around a 4 in inner diameter pvc pipe. I can verify that the 12kv is going through all of the places it is supposed to go through. I have no idea why this isn't working, could anyone help me here?

Question by MohitB34    |  last reply


audio amplifier for singing arc speaker, 110v design

Okay, I'm planning on starting on a plasma speaker, I know somewhat how I want to build it. My neighbor has one of the old school neon sign transformers for sale, he wants next to nothing for it. So I intend to use that to simplify finding materials. I am incapable of designing a circuit, so I am asking for help. What I need is for somethng to control the 110v for the transformer based on the audio input. My alternate idea was to use two NSTs and have them become a stereo channel unit. I do prefer that idea myself. I simply have no idea how to control the sound from the arc without taking the arc out. Honestly, my electronics knowledge in circuit design made me think a really big relay would work. Until I realized that was stupid. Anyways, my preferred idea is using a project box to contain a circuit, fused around critical areas to prevent the music device being blown up on accident or anything else bad happening. A stereo plug, with one transformer being the left, the other the right. I also want to try to drive either the low voltage or the 110v computer cooling fan type things so that there is an airflow through the arc.  Please help me-I can't design circuits for the life of me, and I would rather this work out. Thanks!

Topic by Nyanman  


Snubber network? Answered

Although my flyback transformer driver appears to work very well up to 18V operation, the arc length is not satisfactory. I increased the voltage to 25V which allows 2 to 3 inch stable / hot arcs. However my 250V 18A rated MOSFETs appear to fail periodically esp. When adjusting the potentiometers (for adjustments to drive frequency and duty cycle) I Tried sticking a 1N4007 reverse biased diode across but I don't think it changed anything. I still see >300v positive voltage transients. I also tried using a neon lamp without a ballast resistor, but it did not appear to change the waveform, and glows way too brightly. I tried using 3 (really old but giant) 30V zener diodes in series but they latched up, failed, and went up in smoke lol! So clearly these HV transients have a lot of "oomph" behind them. D:  I am reading an article on maxim electronics page about snubbers https://www.maximintegrated.com/en/app-notes/index.mvp/id/848 and I'll experament with some of the circuits presented there but I can't really calculate values needed for the components because I have not characterized my transformer with custom windings and a loose ferrite core. Those things will be subject to change anyways since I do not plan on supplying a specific flyback transformer with this kit. So I want something that is more universally going to work. This high voltage is just  PITA to deal with. How can I reduce it to 200v without hurting performance?

Question by -max-    |  last reply


what would it take to make a co2 laser from scratch?

I think I have the basic concept, you take a full mirror and a one sided mirror, put them between a tube, pump in 10% co2 gas 5% argon or something inert, charge it with a neon transformer and a few welder's sticks for the anode and cathode respectively, then most of what comes out the one sided mirror should be laser emissions. I know I'm missing something though... any suggestions? I'm not worried about refining the beam into something that could: cut metal, make holes, be a nuisance to my neighbors, I just want a multi-watt laser in my barn that I could use to start my wood stove at the press of a comically big button.

Question by waldosan    |  last reply


need help on circuit design

Okay, I really need help on this. I want to begin a plasma speaker project, but I require help designing the circuit. I can build stuff fine, and simple high-voltage things, but complicated circuits are simply beyond my ability to design. what I am planning on doing is having a standard audio plug (l/r) feeding one circuit-probably needs to be amplified, then split into two channels, then I intend to have each channel control the driving circuit for its own neon sign transformers, as thanks to a neighbor, I will have a couple. I just need help planning out the circuit-I see how people manage plasma speakers with flybacks, but I have no idea how to make a two channel audio amplifier that splits to drive two separate control circuits that control the 110v supply that each NST takes. So, please, I beg of you, help me. and thanks in advance.

Topic by Nyanman  


Tesla coil anyone with new design ideas?

I am in the early stages of building a new Tesla coil. After over 10 years without one I think it is time to add one to my collection again ;) As always I want to stick to to the classic design, meaning except for the HV supply all will be home made, including the capacitor. No no fancy electronics, just high voltage, a cap and a spark gap... However, classic must not always mean there is no room for improvement. Of course you can measure or calculate the frequencies for your primary and secondary coil before even starting to power it up - but where is the fun in that?? My last Tesla coil was driven by a 2KW transformer delivering 25.000 Volts. This time I go smaller for indoor use and will aim for a simple neon sign transformer with around 3000 volts and 20-30mA output. Reason for this that I plan to make an Instructable out of it if I find the time and would prefer to use power supplies that can be obtained in most countries without totally blowing the budget. I did some research on the net to see if there are any significant developments but the only things I could find are in relation to the spark gap or to use a conical primary coil. For the conical coil I could not even find any comparison to standard flat coil in the same system or a decent explanation why it is claimed to be so much better. My aim is to go a different way for the primary completely. Instead of using copper pipe in a standard winding pattern I want to try a quadfilar coil instead. My early tests on a small scale confirmed that a bifilar coil is better than a standard coil. For some weird reson the magnetic field reaches further and is stronger while at the same time there is less loss. So far bilifar coils are only used on some charging pads and "wireless power supplies" for TV sets. In most induction cooktops, where the benefits would be extra obvious, they are not used due to the higher cost factor of producing them. Big question here is: Has anyone experimented with bifilar or quadfilar coils in high voltage applications and is willing share some insight?

Question by Downunder35m  


incandescent light flicker hacks

There are 2 hacks with incandescent lights that make flickering effect. may be usefull for some haloween stuff here is the most basic description. if you build it be carefull in fire safety - some stuff may overheat and blast / catch fire. use non flammable boxes if needed. starters and diodes may explode if connected incorrectly - always protect your eyes do not do any of the hacks with CFLs - they are for incandescents only. they may work with LED lights depending on other components in the ciruit and the amount of current (if there are capacitor / induction / electronics / transformer in the LED circuit then dont do it) hack 1 - slow flicker (i saw it somewhere on instructables before) connect the incan in series with fluorescent lamp starter (the neon discharge type) you may connect 2 starters in series. i'd expect longer outages this way. if they dont light (not enough voltage) then use the starters designed for 2 x 18 W fluorescents. warnings dont connect the starter (or series of 2 or more starters) directly across the ac source. the starters will blow immediately and may explode. check that in any possible path through the starters there is an incan light dont connect stuff in parallel unless you really know what you do. lights connected in parallel take the sum of the currents they take on their own - anything more than 1 light is too much for a starter (or any amount of starters in series - each gets all the current) part 2 - fast 50 Hz flicker connect the lamp in series with an 1N4007 diode. the diode blocks 1/2 of the ac wave and makes some light flicker. seen best in low watt lamps with thinner filament (with less thermal capacity) diode may be used together with starter to combine the effects this hack is used widely in heating appliances that have 2 heat settings. in the lower one they are connected thru a diode

Topic by 11010010110