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4hv.org :: Forums :: High Voltage
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HF Tesla coil and it dosn't hurt?

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sehrgut
Mon Oct 22 2007, 07:22PM
sehrgut Registered Member #1017 Joined: Fri Sept 21 2007, 09:08PM
Location:
Posts: 24
Kizmo wrote ...

Is TC output from toroid really AC? or HF pulsed DC?

Transformers cannot produce DC. This is because even a pulsed DC primary current induces (at the trailing edge) a reverse current in the secondary from the leading-edge current.
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Simon
Wed Oct 24 2007, 01:32AM
Simon Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
That's true, but it's also common for people to say, "This flyback transformer produces DC," when they really mean the flyback has an internal diode.
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Tom540
Wed Oct 24 2007, 03:34PM
Tom540 Banned on 3/17/2009.
Registered Member #487 Joined: Sun Jul 09 2006, 01:22AM
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Posts: 617
This reminds me, I got zapped yesterday by a new drsstc I'm building. Having coupling issues. Went from toroid to left hand then out my right hand to primary. Yes I felt that and it hurt.
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Alan
Fri Oct 26 2007, 11:47AM
Alan Registered Member #1069 Joined: Wed Oct 17 2007, 06:23PM
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Posts: 22
I presume that HC (high current) has the same issues as HV.
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Ken M.
Fri Oct 26 2007, 12:10PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
I think the issue of leathal currents would apply more in that sense.
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ragnar
Fri Oct 26 2007, 01:50PM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Alan wrote ...

I presume that HC (high current) has the same issues as HV.

Not quite. I don't mind having my hands all over my 1.2V, 600A power supply. No significant current is going to flow through my body.

Don't forget that as you might work with 60V, 120V, 240V, 415V etc, it becomes awfully easy for those 30mA to flow.

Look at ohm's law and think about what current may flow with what voltage present.
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Alan
Sat Oct 27 2007, 10:31PM
Alan Registered Member #1069 Joined: Wed Oct 17 2007, 06:23PM
Location:
Posts: 22
How long is the arc in your setup mat?

Link2
I only know values in volts, I don't know what realistic values to put into the other fields would be, why cant battery's and stuff have current measurements on them as well as volts, would make it easer understanding such stuff.

lol, I was never talking about only HV from post 1.
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...
Sun Oct 28 2007, 01:53AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Things aren't rated in amps, because there is nothing to rate. It will put out as many amps as are necessary to put out the stated voltage, up to the point where it can longer keep up with the load and the voltage starts to drop.
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ragnar
Sun Oct 28 2007, 03:02AM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Alan wrote ...

How long is the arc in your setup mat?

What setup? From that particular burn? It was a CW discharge brush about 2" long.

wrote ...

Link2
I only know values in volts, I don't know what realistic values to put into the other fields would be,
Yes you do, it's easy! If you've ever grasped the probes of a multimeter in each hand, it can give you a ballpark figure of the resistance you might expect between those two points. As soon as current starts to flow and burn things, or if you penetrate your bloodstream, that changes, but:

Say you measure 100kohms between your hands, and imagined touching a mains/live wire when its voltage is at the peak in the cycle (340V), you could expect a 3.4mA of current to flow.

Say you wish to calculate what resistance would be needed to allow 30mA (typical figure that might fibrillate/interfere with your heart badly) to flow, if you came into contact with a mains/live wire when its voltage is at the peak in the cycle (340V), you would calculate a resistance of 11.3kohm is needed... which is pretty easy to achieve if your hands are damp, sweaty, or you pierce the skin.

See how it works?
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