How do I charge a capacitor rated for 450v at 1150uf using 2 AAA batteries?
I tried using a mini transformer but it takes a very long time.
Is there a quicker solution?
IndianHacker

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#### Correction

Capacitave Energy = C*V*V / 2

E=.00115 Farads x 450v x 450v /2 = 116 Joules

Battery Energy = watt-sec = 3volt*.540AH*60s/h = 97 Joules (Carbon-Zinc)

Alkaline battery = 3v*1.2*60 = 216 Joules x .6eff = 130 Jouls

and the efficiency of a 3v to 445v DC to DC converter may only be 60% efficient .

So if you use a converter and two AAA Alkaline batteries you should charge your capacitor in one hour

#### IF

the AAA voltage maintains 1.5volts for the full hour.

I am guessing the thing you call "mini transformer" is some kind of DC-to-DC converter,

https://en.wikipedia.org/wiki/DC-to-DC_converter

more specifically a boost converter

https://en.wikipedia.org/wiki/Boost_converter

This type of circuit is commonly used for charging the capacitor for xenon flash tube, for cameras.