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Author Topic: +2 million Volts from a small self defense stun gun, plausible/needed?  (Read 311 times)

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Offline mcinque

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They claim 2.400.000 Volts (of course infintely small current, it's not specified how much).

Is this kind of voltage plausible/needed for a stun gun or is just for marketing? Do they have enough space/isolation to reach that voltage in a handheld product avoiding arcing and shock to the owner?

I've read tasers discharge 25 Watts of power at 50.000 Volts (and they're really effective!).
« Last Edit: September 24, 2017, 03:03:31 AM by mcinque »
I'm basically still a rookie and because of this, even though the best of intentions, I often say bullshit, so never mind.
 

Offline CatalinaWOW

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Re: +2 million Volts from a small self defense stun gun, plausible/needed?
« Reply #1 on: September 24, 2017, 03:57:19 AM »
There is another whole thread on this class of devices.  The advertising claims just keep climbing.  The only limit I see is the number of digits they can fit on the page with multipliers that the advertisers know.

http://www.eevblog.com/forum/chat/new-physics/msg1159399/#msg1159399
 

Online Cerebus

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Re: +2 million Volts from a small self defense stun gun, plausible/needed?
« Reply #2 on: September 24, 2017, 12:42:11 PM »
Ponder this: The approximate dielectric breakdown voltage of air is 3,000,000 volts per metre, for PTFE it is 19.7 MV/m, polythene is similar, so is PVC. That covers most of the common insulators you're likely to find in some electronics. Given that information you don't even need to do mental guesstimation to realize that something hand held isn't going to have enough room to isolate two conductors with a 2.4MV potential difference between them, even if it was made from solid plastic with no air gaps.

Edited to add: And don't even talk about creepage distances at 2.4MV - remember, you have to hold this thing to use it.
« Last Edit: September 24, 2017, 12:45:45 PM by Cerebus »
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline blueskull

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Re: +2 million Volts from a small self defense stun gun, plausible/needed?
« Reply #3 on: September 24, 2017, 12:53:20 PM »
50kV~100kV pulse sounds more sensible for that size, cost and air gap distance.
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Offline David Hess

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Re: +2 million Volts from a small self defense stun gun, plausible/needed?
« Reply #4 on: September 24, 2017, 01:48:57 PM »
50kV~100kV pulse sounds more sensible for that size, cost and air gap distance.

Exactly, the voltage never gets higher because something, hopefully the air, breaks down first.  When using it on a person, the voltage is even lower and it operates more like a constant current or constant power source.
 


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