250 volt capacitor bank - How to charge?

[AAlasers]

Hello all, I am in the process of constructing a 250 volt, 24000 uF Capacitor bank. However, I do not know how to charge it. Is there any way I can increase 3-12 volts to 250 volts? I have various available methods of providing a voltage between 3-12 volts, (Batteries, DC transformers, etc). Could this be done with a step up transformer?

Help is greatly appreciated,
thanks,

AAlasers

 

[Jacob32123]

Rectify the output of one of these DC to AC 220 Volt Power Inverters

 

[Cyparagon]

Why not just use rectified mains-power?

 

[vk2fro]

a few different charging methods are mentioned in this thread that are safer than rectifying mains voltages.

http://laserpointerforums.com/f60/big-capacitor-bank-64773.html

This circuit for example. Change the 5.6k sense resistor on the left, to one more suited to 250V (7.6-9.8kohms).

Then adjust the trimpot for correct cutoff voltage, and you wont overcharge your caps.

A camera flash guts from a disposable camera would work for 3v, but it would take a VERY long time to charge a 24mF bank.