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Static De-shocker Wand

by alany, published

Static De-shocker Wand by alany Sep 3, 2012

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Static De-shocker Wand by alany is licensed under the Creative Commons - Attribution license.

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14133Views 1121Downloads Found in Electronics

Summary

Static dissipative wand for discharging yourself to avoid nasty shocks in a low humidity environment.

Instructions

I was getting zapped all the time at my new job, the floors here and my shoes must be quite a way apart on the triboelectric series. So, I built this discharge wand as a bit of a joke, but it is actually pretty handy, and doubles as test equipment.

Extras required:

1x NE-2 neon bulb (5 mm OD)
1x 39kR 1/4 W resistor (not critical)
2x Brass caps (or copper tape, tube, etc)

Print two body pieces, solder the resistor and NE-2 bulb in series. Place NE-2 bulb so it is visible through the hole in the wand wall. Fold wires over the ends and cut to length, then secure and assemble by pushing on the end-caps.

OpenSCAD file is parametric to accomodate different geometries. I just happened to have two brass caps in the junkbox here that worked well, you can use copper tape, or pieces of brass tubing, or anything else conductive, spheres, whatever. The resistor value is not critical, the smaller it is the more of a chance that you'll feel the current pulse, larger values up to a meg or so will be fine. 10s to 100s of kR are ideal for seeing the flash. You can put a small capacitor (say 1 nF) across the NE-2 and have it blink a few times, or flash while testing ionisers.

Obviously you don't need the neon bulb, and it cuts off at about 60 volts, so it leaves you slightly charged. You can just use a 1 meg resistor if you want, but I like the flash feedback of successful discharge. You won't feel the residual charge.

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I too would like a little detail about how this is used... I'll probably make one and just play around until I get it to work.. but spelling it out for those of us who aren't trained in this field would be helpful..

I'm going to assume you use this to touch to something metal to ground yourself and can then see the flash as it discharges. The resistor value determines if you feel the "shock" or not.. Am I right?

Cool. I might use a capacitor, switch, and LED instead, make it a static-charged flashlight. :)

How exactly do you use it? Do you just hold it and it discharges you from touching both ends? Or do you touch a metal surface with it and hold one of the ends and it will discharge? If so which end do you hold? Does it matter?

the stl file doesnt slice well on slic3r 9.2. any chance of uploading the scad file? thanks..

Oops, I thought I uploaded the source. Done, sorry about that!

This is awesome! Where'd you get the Ne-2 bulb and end caps?

The NE-2 bulb should be available from any electronics store. The one in this I stole from a terrible quality 3-way power tap from Harbor Freight. There are plenty on eBay too.

The end caps are more problematic. I found mine in a box of junk, no idea where they came from. You could remove some from fuses, or cut small pieces of brass tubing from the hobby store. You could also just wind some bus wire around the ends a few times. The brass caps just make a nicer looki
ng unit, but there are plenty of alternatives.

The end caps probably come from a glass fuse (they probably broke away from the glass inside the junk box) used in cars and electrical equipment. They have them at Radio Shack and car part stores.

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