# Capacitors on DC circuits

Hey!

I just recovered two KNB 1560 capacitors (rated 275VAC 0,33µF).

I want to use 2 of them in a series configuration on a DC circuit, where when trigerred by a relay it would discharge in a coil.

Can I use them, or is it impossible given that they're AC caps?

275AC just means they can handle a lot of ripple.
Should be fine for DC.
Caps in series are like resistors in parallel. Ctotal = (Ca*Cb)/(Ca +Cb). If Cq=Cb, Ctotal = Ca/2
I believe you want them in parallel for discharge into a coil. Ctotal = Ca + Cb

One way of generating a high voltage is to charge capacitors in parallel and discharge them in series. Is this what you are intending to do?

I don’t really care about the charge time, I just want to power a coilgun (its for a arduino tank turret to mount on a RC tank)

I don’t think the inductance will destroy anything.

charliesixpack:
One way of generating a high voltage is to charge capacitors in parallel and discharge them in series. Is this what you are intending to do?

How is that done? What would a circuit that does that look like?

Delta_G:
How is that done? What would a circuit that does that look like?

One example is figure 5 here.

165n/775volt.

What do you want to do with that tiny capacitance and high voltage.

Don't know what your voltage/current/time requirements are, but if you want high voltage and high capacitance in a small size, remove the flash capacitor of an old digital camera.
Leo..

The capacitance is ridiculously small, but it's enough (or not, I'll see).

I already have a 200V 680µF polarized capacitor so I don't have to use one from a camera.

Since I have my answer I think this thread can be closed

Thanks!