Hero999

They are two different things, static electricity is potential difference (e.g. across the charged plates in a capacitor) and current is the flow of electrons (i.e. in the coils of an inductor), the principles of static electricity and current flow are used in all circuit so they are both useful.

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Peter_wadley

Couldnt you just put like 20 1uf caps in series and use a 9v battery..

Push a switch and they slowly charge through resistors.. when the voltage of the caps are at 180v.. an led will light..

Then just zap someone?

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audioguru

Where are you going to find somebody who will take the paralleled capacitors from the charging battery and connect all the capacitors in series?

A red LED needs about 2V. A blue LED needs 3.5V. Why blow them up with 180V?

Why do you want to zap someone? Why not do something useful instead?

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Peter_wadley

For the indicator LED: Couldnt you just use a voltage comparator or some thing along those lines to check to see if the voltage is at 170-180?

Or monitor the total current of the circuit? Drops .. rdy

Zapping someone isnt really what I care about.. I just thought everyone in this thread was after that.. Im just after high voltages really

Im just think about how you would wire it correct... how could you have them in parrallel and in series at the same time... hmmmmmmm

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speakerguy79

What you've described is a Marx generator. The trick in getting them to shift from series to parallel are arc gaps. You could also use transistors in lower voltage Marx generators.

Caution: The energy storage in these guys can be a LOT. Keep your caps small.

Hero999

A 1F capacitor charged to 180V wouldn't hurt that much unless you moistened the skin with saline solution or stabbed the victim with the electrodes.

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audioguru

I think twenty 9V batteries in series can kill you.

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Hero999

There's a big difference between 180V for along time and 180V for the time it takes to discharge a 1F capacitor.

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Peter_wadley

wow.. i just made the shocker with this transfomer http://www.thesourcecc.com/estore/Pr...roduct=2731511

and was getting voltages of 1000 + .. no sparks when i shorted the leads though : /

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audioguru

A high current makes a spark when wires are touched together. Your shocker circuit has a very low output current.

You might get a voltage of 100V from that transformer. It steps up the voltage 9.5 times or 19 times. It might give a 1000V spike each time the current in the transformer is turned off.

1000V makes an arc with an air gap of about 1mm. 10kV makes an arc with an air gap of about 1cm.

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Peter_wadley

I see

Can you guys explain how 'audio matching' transformers are able to produce such a high voltages?

I know it has to do with impedance.. the explainations on google are very complex at times..

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Hero999

Audio transformers used to be used in the valve days to math the amplifier's high impedance to an 8hm speaker. They are esentially step down transformers and can be used as step up transformers when connected in reverse.

The flyback effect can also increase a transformer's ability to step up the voltage. Suppose a mains transformer has a turns ratio of 1:12 and a 12V battery is connected to the primary, then suddenly disconnected. When the current in the primary is disconnected, the transformer's inductance keeps the current going, the voltage might reach 120V or so. This is steped up by the secondary to give 1.2kV which can cause sparks.

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zultekmilennia

Hello, I'm new here and founded this discussion. I need some help, if you all don't mind.

I'm trying to build a small version of the stun gun and want the shock given to be minimal, as in, only hurts like a bug's sting.

What changes do I need to make to the components? I wanted to use a different transformer and when I need to get it from my lecturer, what do I tell the him, as in the correct term. I tried to buy it from a store but they said there's no such thing.

I'm very new at this so a little help would be appreciated.

hydromark

Breadboarding of ANY high voltage project is not recommended.

chemelec

The only way I can think of to do this, is build a high voltage circuit that charges a somewhat low capacitance, high voltage capacitor and than shuts off.

The Discharge to the person would be just a "One quick Shot", than the capacitor needs to be re-charged before using it again.

Just a Guess, but possibly using a 30Kv cap, rated at 100 to 200 pF. (Or two in series for 60Kv output.)
I stock these caps, but never tried giving myself a 30 Kv shock from them.

You can get these caps and shock yourself, If you want to try this.

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