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Old 05-09-2017, 01:44 PM #1
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Default Taser core ?

I bought a couple of high voltage step up boost modules from Ebay just to see what they are like. Obviously the stated output voltage is very much over stated. 1000 kV.... Yeah, a million volts... Thats going to be real. A spark about 50 inches

What i was not expecting was the amount of energy in the spark. Both modules jump about 20mm easily. Probaly about 15-20 kV.

The crack from the spark is amazing. Very loud and about 50 a second. I ran them on a 7.4 volt RC LiPo pack.

It seems to me like these might be the core boost module for a Tazer

DC 3.7V-7.4V to 400kV/1000kV Step Up Boost Module High-Volt Output Transformer | eBay

If you like the crack from a high voltage spark these modules are amazing.


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Old 05-09-2017, 02:30 PM #2
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Default Re: Taser core ?

Nice find! Who doesn't like the sound of a nice big spark?! Stay safe of course ... HV shocks, even when there isn't enough current to be dangerous on their own aren't fun. The shock alone hurts and can make you jump and hurt yourself on something else.
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Old 05-09-2017, 02:44 PM #3
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Default Re: Taser core ?

Hehe. I used to play with EHT a lot when i was younger. Amazing stuff.

One of the best things i did was drive an ignition coil from a motor vehicle with some high power tranistors. Then i connected the output to a Radio Antenna about 2 foot long.

Turn the lights off and watch the corona leaving the end of the antenna. Their must have been a lot of RF in the output. Hundreds of fine blue lines leaving the tip of the antenna. Amazing sight.

Being an electrician I have been zapped by 240v many times. Never been done with EHT though.
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Old 05-09-2017, 02:50 PM #4
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Default Re: Taser core ?

Quote:
Originally Posted by Mosc007 View Post
One of the best things i did was drive an ignition coil from a motor vehicle with some high power tranistors. Then i connected the output to a Radio Antenna about 2 foot long.

Turn the lights off and watch the corona leaving the end of the antenna. Their must have been a lot of RF in the output. Hundreds of fine blue lines leaving the tip of the antenna. Amazing site.

Being an electrician I have been zapped by 240v many times. Never been done with EHT though.

That must have created a lot of RF noise!

240V isn't fun either, but doesn't have the same bite.
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Old 05-09-2017, 04:02 PM #5
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Default Re: Taser core ?

Quote:
Originally Posted by diachi View Post
The shock alone hurts and can make you jump and hurt yourself on something else.
Definitely, I shocked myself on 15kv nst leads and although I fortunately wasn't burned, I slammed my elbow into a 2x4 beam in my basement which left me with a nasty bruise. Reminds me of those shock gags I used to buy from ebay, like the pen and gum. Problem with those was although it didn't hurt the victim, they'd throw it on the floor in surprise and it'd almost always break.
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Old 05-09-2017, 04:25 PM #6
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Default Re: Taser core ?

The same thing happens with 11kV at line potential. You dont actually get electrocuted from it. The current passes on the outside of your skin. The damage is when it throws you accross the room. And the burns from the flash. I know someone that was killed by 11kV. It was after a fire in a very large industrial complex. The lines he was working on were supposed to be dead. Problem was that the fire caused a short to another 11kV line. I dont know what went wrong with the safety procedures. Before working on 11kV at line supply they are supposed to be tied to earth first.
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Old 05-09-2017, 05:01 PM #7
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Default Re: Taser core ?

I've got a few in the Shop...
The problem with them is that the internals
heat up and the output shuts down if used
more or less continuously...

Jerry
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Old 05-09-2017, 07:53 PM #8
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Default Re: Taser core ?

I guess because you are in Australia the price for that step up HV cicuit is more than it needed to be. Those same modules are available for $2.99 here in the states. Yeah, thre is nothing new or particularly unusual about a taser circuit. When I was a kid, I used to use an audio output transformer wired backwards to get higher voltages out of a plain 9 volt battery.
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Old 05-14-2017, 12:48 AM #9
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Default Re: Taser core ?

These seem like the circuits used to ignite the spark in gas burners and such, suitable for brief operation with a high output voltage that can strike quite the arc.

Due to the limited power i doubt they would be lethal in terms of direct electrocution, but they sure shock the hell out of you. Often is is what happens after the shock that is actually the problem: you stand on a ladder to work on some mains wires on a light point and get shocked. The shock just makes you jump, but falling off the ladder could crack your skull on the concrete floor below upon landing.

I guess the shock risk of these things is limited: they'll shock you but not kill you directly since there is little power behind the high voltage output (unlike, say a microwave oven transformer that'll run a kilowatt or two without squinting). Sitting in a desk chair you'll probably be fine if you got your fingers between the output, though you'll probably do that only once
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Old 05-14-2017, 12:59 AM #10
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Default Re: Taser core ?

If someone was approaching me with
the High Voltage cracking across the
terminals... I would be backing up.
Good Deterrent... IMO


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Old 05-14-2017, 03:21 AM #11
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Default Re: Taser core ?

Quote:
Originally Posted by Benm View Post
These seem like the circuits used to ignite the spark in gas burners and such, suitable for brief operation with a high output voltage that can strike quite the arc.

Due to the limited power i doubt they would be lethal in terms of direct electrocution, but they sure shock the hell out of you. Often is is what happens after the shock that is actually the problem: you stand on a ladder to work on some mains wires on a light point and get shocked. The shock just makes you jump, but falling off the ladder could crack your skull on the concrete floor below upon landing.

I guess the shock risk of these things is limited: they'll shock you but not kill you directly since there is little power behind the high voltage output (unlike, say a microwave oven transformer that'll run a kilowatt or two without squinting). Sitting in a desk chair you'll probably be fine if you got your fingers between the output, though you'll probably do that only once

These things have a MUCH higher output energy compared to the mild spark from a gas burner ignitor.
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Old 05-15-2017, 12:49 AM #12
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Default Re: Taser core ?

That would depend on the burner really. I've seen some in asia that run propane/butane gas mixture, and the arc to ignite the gas is a centimetre or two in length, nothing like the little spark you see on a gas stove. This arc is created by something like a neon sign transformer - probably something like 15 kV at a few mA at best.

As for power output of these ebay high voltage transformers: The input power is stated as 7.4 volts at 4 amps, about 30 watts. The wires look so thin they could not even sustain this current for any length of time, but then again a short burst would be enough. Surely this could give you a nasty zap and a burn.

But the most dangerous items are those that store charge. Think of things like big photoflashes with xenon tubes. The amount of charge stored in those can be in the same order has used in an actual defibrilator (say 200 to 400 joules) and could kill you upon touching the capacitors terminals with both hands.
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Old 05-15-2017, 02:35 AM #13
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Default Re: Taser core ?

That reminds me of those little disposable lighters that run on butane and use a coil with a magnet inside so when you push the lighter switch it causes the magnet to be spring loaded and released causing an arc between the gas nozzle and the high side of the coil. Kind of neat as it no longer needs a flint and steel rotor.
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Old 05-16-2017, 12:27 AM #14
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Default Re: Taser core ?

I always though those used a piezo-electric crystal to create the voltage for the arc. In fact i have one right here that does not seem to be magnetic (in the sense that it even mildly attracts iron and such) at all.

The ones on stoves that automatically fire when you push the gas adjust button work to a similar principle the iginition on petrol engine does, except that is has only one output (like you would for a single cylinder motor) and the repetition rate is whatever the manufacturer thought practical (1 to 2 Hz or so).
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Old 05-16-2017, 02:25 AM #15
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Default Re: Taser core ?

I haven't seen one in quite some time, but back when they were popular here I took one apart and it had the coil and spring assembly. So I can't speak of the one you have but they have been done the way I described earlier. They surely didn't arc in a continuing way, like at 1 or 2 Hz.
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Old 05-16-2017, 04:01 AM #16
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Default Re: Taser core ?

Quote:
Originally Posted by Benm View Post
I always though those used a piezo-electric crystal to create the voltage for the arc. In fact i have one right here that does not seem to be magnetic (in the sense that it even mildly attracts iron and such) at all.

The ones on stoves that automatically fire when you push the gas adjust button work to a similar principle the iginition on petrol engine does, except that is has only one output (like you would for a single cylinder motor) and the repetition rate is whatever the manufacturer thought practical (1 to 2 Hz or so).
My Gas Stove does not have any power. The Ignitor is Pezo Electric. Some cooktops I have used do have a 9 volt battery hidden inside them. All these ignitors are pissy compared to the ones I got from Ebay. Maybe you should buy one and check it out. The Spark has a huge amout of energy in it. You can tell by the very loud crack when it jumps.

Also, The distance it jumps and the voltage isn't directly related to the amount of energy in the spark.
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