Anybody knows where I can find a schematic?
Marcos,
You can use a computer power supply which will generate 12 volts dc-
check out this site:
http://www.howstuffworks.com/power-supply.htm
then, you can use this voltage tripler from this site, down towards the bottom of the page:
http://recording.org/users/kev/PS.htm
This is just an idea, maybe someone else can verify that this may work!
Arn C.
Thanks, Arn.
hmm.. not sure if the voltage tripler will work with DC.. seems like it triples AC voltage only. Clever circuit, though.
Well, another way to approach it would be this:
You could use a LM317 (variable voltage power regulator). You just feed it 36V or more in unregulated DC, add two resistors [the datasheet explains that] and put a 100uF cap on the output and you've got a clean, noise-free 36V power supply.
The unregulated DC can be generated either by using a 36V wall wart... or by running 120VAC line current through a 36V power transformer, then run that through a bridge rectifier, and finally filter the bridge's output with a 100uF cap.
Datasheet:
http://www.national.com/pf/LM/LM317.html
hope that helps...
dann
Voltage multipliers use AC to do their magic, so a DC supply will not work. Luckily, there are chips out there that will make AC for you at higher-than-audio frequencies. This has two advantages.... first, the capacitors can be of a much smaller value, and second, the AC is above any frequency where you'll hear it.
Check out this info on using the 1044 voltage converter:
http://www.geofex.com/circuits/+9_to_33.htm
Of course R.G. has the data ready and available. :D
The classic name for these capacitor-diode multiplier circuits is a %^&*roft-Walton multiplier, after the inventors.
http://home.earthlink.net/~jimlux/hv/cw1.htm
You see them quite often in low current high voltage supplies, as well as some not so low current versions being used in atom smashers.
(http://www.bnl.gov/bnlweb/photos/%%5E&*roft-walton-1-w.jpg) (http://www-bd.fnal.gov/public/images/%%5E&*roft-walton.gif)
-Peter
Thanks, Peter.