High-Power 555 Flyback Driver

[high1voltage1rules]

Wicked arc's there mate ;-)

THUMBS UP*

[TheVader75]

please give a schematic of the circuit

[hbycoily]

hi do you have a schematic for this 555 driver please.

thanks

steve

[Volta500]

@hbycoily Just google 555 flyback driver.

[kmncztms]

Where can I get a TVR10G diode?

I can't find any, and I couldn't even buy one :(

[a380rockerfan]

Burnt the flyback out? Use a bigger one; more robust and more power :-)

[hitachi088]

@a380rockerfan i have a very small flyback and am using the primary on it. i can run it for hours without any problems, and i am not using any IC or Transistor.

[Alex1M6]

Instead of using the regulator, just use a separate power supply for the flyback and the 555 timer.

[chilidress]

i will die if i touch the focus screen of the flyback?

[SciFacts4YOU]

Pretty cool. Want better? Make a ZVS driver :D

However, a flyback driven with a ZVS has the power to kill you if electrocuted. So be careful.

[mbthepixelkiller]

poor PSU



[45LaFaMiLiaDingo]

O.o hat der die teile da auf die falsche seite der platiene gesteckt?! xD

[CoolDudeClem]

Quite impressive but it sounds like there's some pin-to-pin arcing, did you ground the HV secondary? In my experiments I always have the flyback's HV ground pin connected to the earth ground.

[paulma8]

could you tell me what is the frequency and duty cycle you are using in this 555 driver?

[abo43446le]

just a few questions what is an eqivilent to the a1015 transistior  what gauge wire r u using for the primary & how many turns

[paulma8]

also could you have used 6amp diodes to protect the 555 from the transformer kick instead of a regulator

[paulma8]

i'm pro this experiments, just wanted to make sure you know how dangerous this is,

maybe you should increase the distance, don't use a small screwdriver but a large wood stick

[powermaks]

how many amps does it draw?

[Insignia96]

It would be extremely helpful if you were to just post a schematic, just host it on flickr or something, but this is one of the best drivers i've seen on here and I'd really like to build it. Thanks in advance :D

[ciprianwiner]

i'm gonna make mine tomorrow and thanks for the idea with the LM7812, but i think that i will use an LM7809 to be on the safe side :D

[leandroalgenton]

How much does the mosfet heat? I mean, is it possible keep it turned on for a long time?

[ciprianwiner]

wow awesome man

[pruefziffer]

I see you're using an STW18NB40 which has a very high dV/dt capability, that's a good idea. I'm just using two carefully balanced 2N3055 (push-pull configuration, drawing 10A at 14V), also fed by a NE555. But obviously the voltage slopes are not steep enough and the old flyback I use still has its primary coil on it...so my spark is a lot smaller than yours. (see my vids)

[91Matteoz]

Really nice!!!! can you send me the circuit diagram please?

[CoolDudeClem]

I have a question, would it be possible to connect the 555 to an audio signal to modulate it's pulse width and get a "singing arc" out of that?

[91Matteoz]

@CoolDudeClem YES!! use a 5 PIN of 555

[yTubeBlowsBigBalls]

Why do you use a MOSFET instead of a BJT like 2N3055?

[kjs12224]

is this voltage and amperage safe or is it harmful to mess around with

[mbotv10]

Nice power supply. What model is it?

[azeritutorials]

i can't stop watching this :))

[sprogdiklis]

schematic please

[carebare47]

I don't like the length of that screw driver. If that clip came off (which they often do) that voltage would have no problem arcing through (or over) the plastic handle of the screw driver and through you, and at 4 amps you have 80 times lethal current. Apart from that, I am very impressed =) I have only ever managed to get 4/5cm sparks from my 555 based driver (with four MOSFETs in parallel switching 24v). I must try a STW18NB40 or two. Thanks ^_^

[juniortore1]

@carebare47 no, its 4A input, output is at most 30ma. You had luck paralleling mosfets? Hell, especially with 4 of them. With 2 of them, if the gates dont switch at the EXACT same times, say bye bye to both mosfets. And thats normally what happens. If I were you, I would build a ZVS instead. There is no heating issues, and you can get massive arcs without any circuit issues (heating)

[carebare47]

@juniortore1 The FETs paralleled without a problem, and each one added provided a large performance increase. I have been meaning to build a ZVS driver, but am currently distracted with my electronics coursework (making a 3-phase touch lamp). The ZVS does look very tempting though, I'll start on that as soon as the coursework is finished. Thanks ^_^

[juniortore1]

@carebare47 Hmm, maybe I will try it for my 555 flyback driver. Eventually, I will make a working ZVS, but my attempts have failed due to simple issues

[ReiMomo]

What pins are you using?

Once the the driver is done how does ppl modulate it with audio?

[carebare47]

@ReiMomo Ground the audio - and put the + to pin 5 I believe. Not sure how he has done it, but mine is as follows: Short pins 2&6. Put a 10nF capacitor between 0v and pin 2. A 2.2k resistor between pins 2 and 7 and then a 1k resistor from pin 7 to +v (+ @ about 12 volts). Pins 8 and four go to +v. MOSFET comes from pin 3 (gate to pin 3, source to primary and drain to 0v). Connect other end of primary to +v. Enjoy =P

[remzi133]

Nice flyback i look this video every time if i go to searth: 'flyback driver'.

i have a normal flyback transformer from a crt monitor.

[voon100]

I feel like wanting to put my tongue in between the arc.

[weeardguy]

I should be worried about the primary to secondary sparking ;)

[Digadogup]

wats the name of your psu?

[Twizt3dArc]

This is one of the best, safest and neatest looking ones i have seen! good work!!!

[Alexander470815]

Why it is a Flyback the NE555 work at a constant frequency there is no flyback, because a flyback will adjust the frequency if it get arcs.

[renekenshin6573]

Dude its being over driven, arcs between secondary and primary windings is fatal for both the driver and the insolation

[juniortore1]

@renekenshin6573 thats when it goes in oil. And then you put some potatoes in the oil. Then you have french fires. Thats how McDonalds does it :-p

No, oil should be good enough to insulate that but if the flyback gains heat, then theirs a problem!

[panzuman]

whats the difference between an ne555 and a ks555?

[MrMalecko]

schematic of the driver please ! :D

[forwardbias]

No wonder you burned it up, I noticed in the video arc over from the primary to secondary. You were over driving that coil. 30 volts is way over the normal voltage for a flyback, which runs around 12 volts. Which can cause excessive heat, and arc over, which can cause failures of the coil. Above 19 volts, unless you are carefull, you can easily blow a flyback.

[weeardguy]

@forwardbias Uhm... no. In a normal case, the voltage on the primary is even higher: 160 Volts is about the normal voltage a flyback transformer will endure in a TV or monitor. The only point in this is the fact that there's a new primary wounded on the core, with less insulation.

[mekir87]

for the primary winding, why dont u have feedback windings? and no centre tapped there? one more thing, do u know how to transmit electric power wirelessly using FBT? please reply anyone!

[Shockszzbyyous]

@mekir87

FBT what is that??

i know you can transmit electrical energy with a tesla coil,

google it ;)

[mekir87]

FBT=FlyBack Transformer

FBT have the exact potential use for wireless power transmission as tesla coil does.. anyone have put a test to this claim? I did!

[Shockszzbyyous]

but i thought that because a tesla doesn't have a solid conducting core, it could send more out then a transformer with a coil?/

[mekir87]

doesnt matter if u have core or not. no solid core means, u use air as the core depending on the permeability of the material itselff. Using conducting core will help to concentrate flux flow across it.

but u could be rite, if theres no conducting core, the magnetic field can go farther..

[weeardguy]

@Shockszzbyyous Very simple stated: Yes. The fact the voltages can go way higher is because you don't have the insulation problems a transformer with core-coupling has, as the primary and secundairy aren't close to eachother. The downside is that air-coupling requires a good balance between the primary and secondary circuit, that actually act like two LC-combinations, and have to resonate at the same frequency.

[Nanovirus5995]

@MacsCanfly - "Flybacks for use with a cascade (voltage multiplier). This type is common in (old) large color TV sets, as these need a higher acceleration voltage. The flyback output is usually around 8-10kV (peak to peak), which is often tripled by the cascade to 24-30kV DC."

that's from Jochen's High Voltage Page. Sounds right but to be brutally honest with you... I don't know enough yet to answer that question thoroughly.

[MacsCanfly]

how many KV?

[Nanovirus5995]

Ive been told that they run at about 20kV but personnaly I dont belive this is correct. Im thinking around 6kV to 10kV if your lucky. not sure about the milli-amperage however there are ways of finding out with multimeters. Id like to know exactly how many kV's there are aswel to be honest.

[MacsCanfly]

iv ben told that two but don't believe it cause i got a 7.5kv NST and its stronger than this

[Nanovirus5995]

Ive done some reaserch. And judging by the lenght of the spark and the color, sound and all that, id say its around 30-40kV. Ha i was Waay of. Amazingly tidy setup aswel. Good job Derekaggs.

[MacsCanfly]

@Nanovirus5995 the length of the spark/arc on a nst is just as big and its 7.5kv how does that make sense

[Shockszzbyyous]

@MacsCanfly

start length equals voltage,

and i though it's 1kv per 1mm

and 25kv per inch

[6418978876]

@Shockszzbyyous The wiki page for "spark gap" says air breaks down at 30kv/cm.

[Shockszzbyyous]

@6418978876

aw man it's changing every time lol :P

i made i mistake i admit, one site say's 25kv/inch other's say 1,5kv/mm

loool

[juniortore1]

@Shockszzbyyous lawl. Who knows, there are too many variables. Theres humidity,

temperature, and the barometric pressure.

[juniortore1]

@zker666 and oxygen 2 (typical oxygen we breath) turns to oxygen 3 - ozone

[zker666]

@juniortore1 yes, corona wind, and us high voltage enthusiasts run on ozone =D

[juniortore1]

@zker666 Yes. Want to know whats sad? I just made my first working 555 timer today to power a speaker, Now I will work on 555 flybacks :) My last 555 I failed, idk why. But flyback lead to a sstc.

[rroge5]

i asume those little sparks from the primary arnt a good thing?

[SunGodAmonRa]

Can you tell what flyback transformer is used?

It's difficult enough to get proper transformer, most of them are filled with epoxy, so there is no way to disassemble it.

[TinselKoala]

Very nice! Some minor probs but better insulation will solve it. What is the operating frequency? I'm surprised I can't hear it singing.

[derekaggs11]

For those of you requesting a schematic, simply google "555 flyback".  It's the simple, standard circuit with only a 7812 regulating the 555 and full input voltage being sent to the MOSFET.

[juniortore1]

@derekaggs11 will lm317 work? This is my "new" juniortore account. Other one got suspended, then closed 0_0

[GearzVoNKod3]

@derekaggs11 so how exactly did you hook it up in that way? I have some ideas, but not sure about them.

[IamTheMaxXx]

That homemade flyback transformer isnt properly calculated, check out on 0:22 how the current breaks the primary isolation. When he move away his wire (making bigger the load resistance, the air) since isnt a duty cycle controlled flyback, magnetic field needs a way to escape easier than break the air isolation between the secondary and the output wire, so periodically discharges in primary intrinsic resistance and parasite capacitor. This can make a short circuit, so beware!

[Elettronico94]

Awsome!

Visit my channel please, I've built a Royer Oscillator that can drive a Flyback Transformer.

[juniortore]

what is the voltages of the capacitors

[joselu90]

Yeah coils are cools, I need to make a pulse generator cos I have an old flyback, and I want to do that.

[Sheaxyz]

wow.... thx m8 :)

[emboracas]

hey man, you have sparks between primary and secondary...

[teslanumbertwo]

can you send me the circuit diagram.

[Pelle4495]

@Pelle4495 ps: add ht tp:// without the space. Annoying youtube doesn't let you place links

[juniortore]

why and how???

[wankelFan2]

can you give me a circut plan?

[achahid55]

Hi derekaggs11

nice arc,but honestly are you using the PIC12F683 or a 555 timer chip? if a 555 timer where do you control the duty cycle and the frequency with?

could you please send me the schematic of the circuit with the values of the components?

thanks in advance

[juniortore]

its a 555

[Ravenpulse]

0:21 you can see the primary arc to the transformer! be careful u may wanna put it in oil

[Gintaras]

I'm working on this driver and I already burnt up 3 MOSFET transistors! I'm not sure why, the power source is only 9v battery... But what are those 2 green capacitors for? The circuit I found has only 1.

[zezimashock]

you got those nice silent arc's (not that the are silent they are just not hear able?)

[juniortore]

what happens if you try to power an ignition coil with that?

[derekaggs11]

It should work just fine but back current EMF may be higher so you'd need some blocker diodes. I've never even powered an ignition coil myself...

[juniortore]

what type of 555 timer is that, can you send me the diagram of the circuit? thanks nice arcs.

[derekaggs11]

Its the standard simple 555/MOSFET driver. Just google it. The trick here was using a high-powered MOSFET but limiting the 555 voltage with a 7812 regulator so it wouldn't burn out. You can see the FET and regulator share the heatsink.

[zezimashock]

almost looks like zvs

[Tomi954]

This is very good! Send me please scheme:

[kalebman5000]

wow thats a good driver, thats pretty impressive for how small the flyback is. congrats!

[derekaggs11]

Thanks! I'm impressed at how reliable this driver is... it hasn't failed me yet despite driving enough power to fry a few flybacks :-P

I forgot to mention that the component to the left of the MOSFET is an LM78M12 voltage regulator that allows only 12V to safely power the 555 while the full input voltage (30V in this case) drives the MOSFET branch. It's a simple circuit with no trick diodes or darlington transistor stages :-)

[juniortore]

immerse the flyback transformer in oil, can you send me the link you found the driver on or how you made it. I already bought the transistor please, good driver

[flure1234]

@derekaggs11 do you think that it will wor when i use a irf640 instead of the STW18NB40

[HVdischarge]

hi. i wondered if anyone here could help me? i have a flyback transformer and built a 555 driver for it (3x tip3055 npn transistors) but i can only get about 3 amps into the primary winding at 12v (original primary) and i can only manage to get about a 3mm arc out of it can pull to about 1cm... i ramped it up to a 24v input but didn't gain any voltage (only ampage) (can pull to about 2cm at 24v) could anyone please help me try and increase the output voltage? thank you..

nice video :-)

[jovicakluk]

ahh i see what the problem it is your transister it is not good for this cuircut the best transisters to use for the 555 driver is the ones from cordless drills make very large arcs

[HVdischarge]

thanks for the reply.hmm... are tip3055's not fast enough or something? could you give me a specific transistor that is good to use? thank you :-)

[jovicakluk]

no its not thet i think its just thier specs well any ways get a tip122 its a darlington epitaxial base npn transister capable of 100 v at 5 amps with about 60 watts odf heat dissapation make sure you heat sink it and

[HVdischarge]

could it be the driver itself? it does seem very basic all i have is 1 capacitor and 2 resistors, + 2 variable resistors, 1 for power, 1 for frequency :-/... everyone else seems to get like 2cm arcs out of thiers using the same transistor :-(...

[jovicakluk]

i dont think so btw what is your capacitor value

[HVdischarge]

ive used several for different frequencies, i think ive used a .5uf (was too big) a .22 and now im using a .1uf for higher frequency.

does that make a difference to the output power or something?

thanks

[bfeely]

Try using a high power MOSFET. It has a lot less resistance than a bipolar transistor, thus allowing a lot more current to flow.

[HVdischarge]

hi thanks for the reply... i have never used a mosfet lol.. are they the ones that have a gate, source and drain as appose to base, collector, emitter? if so can i do like a pin for pin replacement from a transistor e.g put g were b used to be etc...etc... or is it not that easy?

thanks

[bfeely]

As for the MOSFET, get an N-channel to replace an NPN and a P-channel to replace a PNP. Substitude drain for collecor and source for emitter. You may have to modify your circuit to properly drive the gate, for example make sure the gate voltage is 0 when you want the transistor to be OFF, and 10-12 volts (usually, check datasheet) for ON for maximum efficiency.

[HVdischarge]

great :-) thank you very much :-P

[HVdischarge]

hi, me again,i think i might of been using the wrong pins... i have done alot of messing about with these and i seem to get better arcs of every other pin than the one i was using lol... but i have one big problem now, when i operate my flyback i can actually pull the primary coil wire away from the battery terminal and it arcs about 1/2 and the flyback continues to operate... can anyone help me out please.

thanks

[mekir87]

thats because ur capacitor still emits power dude...

[Sparrow338]

Those are some very nice results you got from the 555 driver circuit. I've found that most flybacks can't handle open circuit operation at high power levels, hence the "clicking" noise as the secondary arcs over internally. 5/5

What kind of bench supply do you have there?

[jovicakluk]

its a variable 0-5 amp 0-30 volt linierpower supply

[alwinovich]

danger!

at 0:21 it sparked to the primary!

thats bad!

[jovicakluk]

i like your power pupply

[CrashByron]

do you have a schematic I could use for this?

[jaa93997]

pretty cool dude, may i recommend the D1555 transistor, wich has internal clamps and protects the flyback more

[mumish13]

which is the circuit what you will use?

[mumish13]

your circuit is a LOPT tester..great!

[triggerhappy77707]

what schematic did you use?

[derekaggs11]

The standard 555/MOSFET circuit with a 7812 regulator on the 555, nothing special.

[mumish13]

wow!

[triggerhappy77707]

Omg!That is incredible!do you think irfp460 will give good output power?

[derekaggs11]

It should give more; an IRFP460 is a higher-spec MOSFET than this one here (but also more expensive).