# Large Cap! What to do?

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#### Christian

I juste got hold of a large cap, 34 000 micro/55 V, very cheaply.
But is there anyway I can use use it as a stiffening capacitor since I only got a one?

Best Regards,
/Christian V

#### mefinnis

That's not a large cap ....... this is a large cap:

http://www.aquila.net/berthickman/frames/gallery/capbank3.jpg

In case you are wondering, "These low inductance Maxwell pulse caps are each rated at 70 uF @ 12 kV, and 100 kA peak, and they weigh 165 pounds apiece".

Sorry this is off-topic, but I saw "large cap", then had a giggle

cheers, mark

#### Christian

AAAAAAAAHHHHHHH, those are big!!!! what are they for?

/Chris

railgun

#### joensd

those big ones look like from a laboratory where they do research for pulse techniques for example to blow up concrete by attaching high voltage to big wire that´s inlayed in the concrete.
we got the same caps in university for that purpose.

(funny to see professors turning into children and playing around with lightnings and blowing up things)

#### peranders

Paid Member
Christian said:
I juste got hold of a large cap, 34 000 micro/55 V, very cheaply.
But is there anyway I can use use it as a stiffening capacitor since I only got a one?

Yes, you could build an AC coupled amp (at the output) but I would not recommend it.

#### Christian

Can I use it over the + and - rails? instead of either +/- and ground

#### mefinnis

Actually, if you go back to the root website above you will see Bert is into "Quarter Shrinking".

It's an interesting website ..... have a look.

cheers, mark

#### Peter Daniel

Paid Member
If the voltage rating is higher than voltage between rails, I don't see a reason why you couldn't use it between rails. I presume that cap is an addition and you already have a ground in the circuit.

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