Just a thought,

There is a transformer available called a 100 Volt line transformer, they =
are used for building P.A. (Public Address) systems & often out door =
events. The secondary on these is usualy quoted as 8 ohms, some are multi =
tap.  These would be better suited for passing 10KHz.


Regards Peter

>>> adampic@UBASICS.COM 04/15/02 12:25PM >>>
Something to think about, Jesse, is that the power transformers you are
planning on using are most efficient at 60Hz.  You are probably going to
lose a good deal of power at much higher frequencies.  For quick and
dirty, go for it, but I'd look into getting a different transformer (or
making one yourself) which will also be smaller due to the higher =
frequency.

-Adam

Jesse Lackey wrote:

> Hello all!
>
> I'm in need of a power supply for electroluminescent wire.  I'm going to
> be running many strands of 1 to 5 feet each.  I'm going to be running 24
> strands per "box", and at approx 1W per strand on average (and not all
> on at the same time) I think a 20W power supply will suffice.  I'd like
> to be able to run multiple "boxes" as this project grows.
>
> But this is a somewhat unusual thing - 100VAC (can be anywhere from 50
> to 150V, prefer 100V) @ 10Khz (also can be anywhere from 5-10Khz, and
> variable would be nice too).
>
> I'm not very good with analog EE stuff and this is for an "art" project
> happening shortly so taking any shortcuts now (and building it "right"
> later) is desirable.  Also keeping it cheap...
>
> Here's what I'm thinking.
> Use an audio amplifier (basic solid state cheapie which I already have).
>  100W amp into 8 ohms: P=3DIV, V=3D I/R, so V=3D sqrt(P/R), so V=3D =
sqrt(100/8)
> =3D 3.5V at full power, or sqrt(20/8) =3D 1.6V at 20W out.  Feed the =
audio
> amp a 10Khz (or whatever) tone, and using a 30:1 to 40:1 transformer "in
> reverse" to give me 50-140VAC out.  The transformer needs to handle up
> to 10Khz.
>
> 1) Does this make any sense?
> 2) What should the transformer rating be?  I see power ratings on (some)
> transformers in mail-order catalogs.  Is this max power delivered to
> load on secondary?
> 3) I'm guessing either a toroidal (as used in switching power supplies)
> or an audio transformer (output stage of tube amps) would be the way to
> go.  Correct?  Any recommeded sources?
>
> Any other suggestions?
> Much thanks in advance!
> Jesse
>
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