Voltage doubler circuit, please recomend some

[JebemMajke]

I need a voltage doubling circuit for my PCB drill power supply. My old one ( 27v ) blew up last night  . I have a 16v 2,3a wall wart. And i need at least 27v. Can i use this one?

[R.G.]

I think you're out of luck.

Driving a motor is a high-current problem. Voltage doublers do not cope well with high currents, at least voltage doublers like we use here. In particular, a 555 driving an emitter follower pair probably won't do what you want. Could, maybe, but I would not try it.

If I were desperate for a drill motor supply at about 27V in an emergency, I'd try two car batteries or some such to get 24Vdc at substantial current.

[moosapotamus]

How much current do you need? I don't know for sure, but what about a DC-DC converter circuit... LM2577, maybe?

~ Charlie

[JebemMajke]

My little drill works fine with 9v. But it so sloooooow.
With 16 it's better, but it's still slow. With 27 it was "zap" and we have a hole 
IT's not a professional pcb drill ( if such a thing exists ). This one is DIY, motor is taken from an old VCR ( or cassette player ).

And two car batteries are not easy and cheap to find

[R.G.]

The question is then "how much current do you need?"

[JebemMajke]

At least 24v.
But im not in the position to buy one. It's 20 euros here and I'm out of money in my "DIY fund"
And I though, since i have this 16 v with 2,2 A's ( the one i've used before, the one i've fried, was 27v but only 0.7A's ) and few 555 timers i might as well make myself 27v power supply.

Any suggestion?

[iccaros]

to answer the question, they need the current draw not voltage.  if you fried a .7 amp 27 volt supply, it may be safe to say that is pulls more than 700ma.. which these voltage multipliers will not do...  you would be better to get a 24v transformer and go from there.

[JebemMajke]

A screw fried my power supply , not my drill . My power supply was out of the box and I guess i've placed it on top of a screw and it shorted plus and minus and puffff xD.

So yeah, it doesn't need more than 700mA

At the time I'm using that 16v, 2,2A power supply and it works, but a bit slower than before.

[iccaros]

look here, this may help
http://www.allaboutcircuits.com/vol_3/chpt_3/8.html

[JebemMajke]

Nice. Thanks.