On Aug 22, 2004, at 7:47 PM, Russell McMahon wrote:

> More details anon if nobody else weighs in - but they probably will.

Ah.  I knew it left something old.  The circuit should operate from 3
to 5V or so, although some degradation at lower voltages is permitted.

>
> You can get eg 80v with no great effort with a single inductor and a
> choke from supply to collector of a small high voltage transistor (eg
> MPSA42) .
>
I want more than 80V.  Preferably, something on the order of 110V.
110VAC (which is partially what the stuff is designed to work on) is a
depressingly high number once you convert to peak-to-peak (multiply by
2*sqrt(2), right?)  Efficiancy should be pretty good, but is not of
paramount importance (however, I discovered that a camera flash
inverter will power some length of EL-wire if you intercept it at the
HVAC part.
While drawing more than an Amp from the 1.5V cell.  That's NOT
efficient enough :-)
>
> 80v odd should be easy enough. For eg 50 mA, 100 uH, 5v  say you get
> tmax = 0.050 x 100E-6 /5 ~= 1 uS on. 500 MA max = 10 uS etc.

Thanks.  That's particularly useful.  I was hoping I could tune in a
desired input current.  In theory, I understand basic electronics
including inductors.  In reality, I've never had to DO anything with
inductors, and I have about ZERO "feel" for how they work...

BillW

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