Reverse stepdown circut taser

I was taking apart a old phone charger and i got the stepdown circut and figured out that it worked in reverse as a step up from 4.5v to 110v of the wall socket or so i thought after a few trys and a few sparks i found the positve and negitive wires hooked up my multi meter and put and tried it with a Cr123
and my multi meter is rated up to 900v and IT BLEW when i hooked it up so thats wayyyyy more powerfull then i expected. and now to the point any ideas what i should do with this taser set up not sure if its safe to poke people with so any other ideas??

Hmm. A transformer would work both ways, but wouldn't accept a DC input.
A solid-state step-down circuit wouldn't work backwards at all. Sounds fishy to me. Besides, I can't see one CR123 resulting in a KV of output - A circuit to do that is certainly doable, there's just no reason it'd be in a phone charger.

I have know idea how it blew my multi meter its just shows 943v's now and thats it so i assume it blew i started three seperate fires just trying to get to work and to jump up the power i followed some utube video that used some big caps in a simple circut guess i didnt mention that in my description sorry still a little loopy from accidently touching it.

So it does give a bit of a shock? Have you tried sparking pieces of metal? ;D

strange, if you have pics of your setup i would like to see it

a transformer should work on reverse, but as someone said up there it shouldnt work with a direct current input..

Unless you show us some pictures, there is no way to tell what's going on..


From your description, it's a wonder, that it works at all, but if you say you got shocked by it, i guess it has to. But show us some pictures please. I'm interested as well.
Since it was a wall socket transformer, it was being fed AC, which it then transformed into a lower voltage, and rectified it into DC..

Simply feeding it DC from a battery shouldn't work..

It is possible to turn such a transformer around, but you would need some transistors, that would turn DC into short spikes.. It's not very efficient, but it works.


Otherwise it's not that hard to make a high voltage generator.. I made up to 20kV from a simple flyback inverter transformer (intended for charging flash capacitors) and a diode/capacitor voltage multiplier. I don't know what would happen if i attached a multimeter to that, but i don't want to try.. I did measure the transformer output tho, and it was above 1000V. I measured the output voltage, by trying how long a spark i can make.. 1cm is 10kV through air, i think...

Unfortunatelly i can't get capacitors rated higher than 500V for cheap, so that multiplier is constantly dying, when a cap blows - usually when drawing 2cm long sparks.. Otherwise it could make a much higher voltage, simply by putting more into the transformer. As it is, it works from only 6V...


I also have some schematics that work from a normal transformer somewhere around, and it's actually pretty simple.. But you need a dual output transformer 220V/2x6V.. Or in your case 110/2x3 (if it exists) so you get the same winding ratio...

With a flyback inverter you only need one transistor. I have several of these left, from when i had to charge a bank of capacitors to a very high voltage, only to then discharge it through a huge coil in a split second, and create a powerfull magnetic pulse.. It's fun, but it can be very dangerous.. The current through the coil was a spike larger than 200A... It could kill many people at the same time instantly..

Make a taser out of a flyback transformer from a TV!
Thats what I did.

happytomato said:

Make a taser out of a flyback transformer from a TV!
Thats what I did.

Click to expand...

can you teach me?

Yes. First thing, go look for an old colour tv. Tell me when you have it.

cybob101 said:

[quote author=happytomato link=1203988116/0#7 date=1205777995]Make a taser out of a flyback transformer from a TV!
Thats what I did.

Click to expand...

can you teach me?[/quote]

WHAT THE HELL

dude dont teach him how to create a dangerous thing with a flyback!!


its not that i dont want you to


well, the flyback can convert the AC input into 20-30kV.

imagine, that amount of voltage is really harmful.


although i am really curious about how u made your taser with a flyback, did u just reduce the output to "normal" values?

: Some people just dont get high voltage :
A flyback will not kill you. Yes it is 20-40kv, but its only like 1-2ma as long as you dont add any kind of capacitor to it. Sure it will hurt like hell, but thats what tazers do ;D Yes you can reverse transformers, but the output is not great enough for a decent tazer, more of a kids toy.
Flybacks are very high frequency transformers, so if you got shocked by it, you would not feel the SHOCK, but more the deep RF burn it will create. People can touch flyback arcs without ill effects (Do not try this on purpose. While it can be done, there is no way you can tell if the flyback is a high enough frequency!)

As IgorT said, for a flyback, you only need about 2 resistors, one transistor and some wire and a heatsik for the transistor. It is very inefficient, but it works well, and self tunes itself for your flyback to optimise output. I hae generated over 80kv on a flyback with this circuit (though it did die a short time later). Search google for "single transistor flyback driver"

I havent been bit by a flyback, but did get sent across the room by an old oil furnace igniter. The current went through the bone in my forearm, my hand was grounded and it jumped into my elbow. I counted my lucky stars it wasnt my other hand or one of my feet grounded. 10kv of disgustingly raw inducted power, that was the only time HV got me I have been very maticulous with the dangerous stuff ever since. I dont think I would enjoy a flyback either :question

I currently use a pc monitors flyback to drive 3 2mw hene's, 6in uniphase tubes. Works like a charm

Well, flybacks are way less hurtful (is that even a word?!?!? ;D) than oil ignition transformers. oil igntion transformers can be up to 10ma I got a neon sign transformer recently. Thats 15kv, at 30ma, at 50hz!!! Touch that and im most likely dead. Be careful around those oil ignitors too, they can pack a punch.

50 or 60hz for you americans is the most dangerous frequency in terms of high voltage, since it causes fillibration (spelling?) in the heart easier than other frequencies. High frequency power travels on the outside surface of your skin, so its somewhat the safest, if you dont count nasty RF burns, which i can tell you, hurt a HELL of alot!!!