High voltage Capacitor question

[Tesla369]

Hi guys,

I am trying to locate a 34 micro farad, 5kV capacitor.

This seems a hard thing to find.

Can anyone point me in the right direction please to a supplier that sells this type of cap?

Many thanks,

R

 

[Jesse18]

Please let us know the application, do you have a picture?

 

[rjenkinsgb]

They are available, but I think you will have to use a combination of parallel and/or series ones to make that up.

Two of these in parallel would give 40uF:

30665 - Synthetic-Capacitor - Capacitors - Richardson Electronics

www.relltubes.com

Or, eight of the 85uF 1400V from the page below:
Two parallel chains each with four of those give 42.5uF at 5600V rating.
**broken link removed**

Or sets of thee, 100uF in series would give 33.3uF etc.

You would need suitable equalising resistors to ensure the voltage was divided equally over the series sections..


Note that the energy storage of that array at 5000V is over 400 joules.. It's the energy equivalent of a small bomb.
And the voltage is enough to kill you before you ever realise you have touched the wrong thing.

It needs extreme safety precautions - and will be extremely expensive!

 

[Nigel Goodwin]

Hi guys,

I am trying to locate a 34 micro farad, 5kV capacitor.

This seems a hard thing to find.

I would have thought so, not much call for them (and not much use for them) and it's also likely to be extremely expensive and pretty large if you could ever find one.

And 34 isn't a standard value anyway, and you don't mention the tolerance required?.

When I was at college one of our lecturers used to talk about his time on radar during the war, where capacitors were as big as the classroom we were it!.

 

[Tesla369]

Wow folks, what a response! Thank you, that info is really useful.

Either a single capacitor or a cap bank will probably be fine.
It is for making a magnetic resonance generator system (Too much to explain here) But similar to those built by Don Smith in the 1990's.

I appreciate that this is a very dangerous amount of charge and that great precautions must be taken here, before messing about with it, or switching it on!

I will not attempt anything without knowing what I am doing, and wearing proper rubber insulation gloves etc.

If I succeed.....I will of course let you all know

 

[rjenkinsgb]

It is for making a magnetic resonance generator system

That is a supposed "over unity device".
You are wasting your time and money, none have ever worked; the whole principle is fiction based on a lack of understanding of basic physics and electrical principles.

[Any that claim to work are scams & rip-off schemes].

One of the supposed designs below; it's total nonsense and cannot do anything other than waste electricity - and money on the parts used.
(OK, it can probably start a fire as well due to the crazy design).

 

[shortbus=]

I don't know, that 12VDC neon sign transformer sounds kind of cool.

 

[sagor1]

Ohhh... A Spark gap transmitter or RFI generator.
I agree, that circuit seems useless for its function, other than creating lots of interference with radios, TV's and even wifi....
A 12V battery, as shown on the left, can never provide 7500W ("or more") output as shown on the right....

 

[Tesla369]

You're probably right.....I should never even try.
I'll just give up and stop experimenting at all, because everything is known already.

I wonder if Tesla ever took that attitude?

 

[Pommie]

wonder if Tesla ever took that attitude?

You're talking to todays equivalent of Tesla (not me) and ignoring them. The circuit above is complete nonsense, if you have a circuit that is electrically sensible then I'd like to see it. BTW, I don't think rubber gloves will keep you safe.

Mike

 

[rjenkinsgb]

I'll just give up and stop experimenting

Experimenting is to advance and improve knowledge.

The functions and interactions of every part of a circuit such as that can be predicted without building it, if you understand electronics.


The people who "invent" circuits like that do not understand the most basic principles.
One very obviously stupid part is having a bridge rectifier in a point where the voltage is already rectified and smoothed.

A less obvious one to someone not familiar with electronics is the "voltage divider" to reduce a supposed 5000V or more to 12V...

300W in to the "12V to 120V inverter" at the output requires 300/12 = 25 Amps input current, not allowing for inefficiencies.

The tesla coil output will be milliamps if you are lucky.

If you could connect a power source capable of 25A at 5000V, the upper resistor in the "voltage divider" would be dissipating around 125,000 Watts as heat; for 300W output.

The whole circuit and concept is simply nonsense, parts connected virtually at random.

-----------
If you were considering building something with reasonably low cost and low danger, I'd say go ahead regardless, as testing and examining whatever you built (whether it works or not) adds to your knowledge and understanding.

However the thing you are considering will cost ludicrous amounts and is very dangerous, with voltages involved that that you cannot test and examine with such as a multimeter. It's a waste of money and you cannot examine the details of what it is doing safely or without extremely expensive and specialised test equipment.

 

[Nigel Goodwin]

You're probably right.....I should never even try.
I'll just give up and stop experimenting at all, because everything is known already.

I wonder if Tesla ever took that attitude?

He should have done, as much of his supposed 'inventions' didn't work, and never could - he did some great stuff, but did a hell of a lot more rubbish. But that's what experimenting is all about, most stuff you do fails, but it's still important to do as failing proves it doesn't work, so you can move on to something else.

As soon as you asked for a crazy value component it was obvious you were trying to do something that is impossible, as the scammers who set these things up commonly suggest near impossible parts so as to give themselves an excuse when it doesn't work.

They have never managed to get it to work, despite their claims, why do you think you can?.