Re: Drug store bonanza: AA cells & low VCE(sat) xstrs

From: Watson A.Name - \ (NOSPAM_at_dslextreme.com)
Date: 03/27/05 

Date: Sun, 27 Mar 2005 01:58:06 -0800

"Michael" <NoSpam@att.net> wrote in message
news:42461918.7E2E4546@att.net...
> "Watson A.Name - \"Watt Sun, the Dark Remover\"" wrote:
> > HTH! Glad to hear you've hit a bonanza. Watch out for them charged
> > caps! They BITE!
>
> YES! At least one kind of Kodak apparently stays ON, once on. This
type uses a
> neon for the Ready light. The first of this type that I opened, I hit
the
> shutter, removed the battery (took me a second or two), then grasped
the PC
> board with one hand and reached for the cap. leads with a forceps, to
make sure
> the thing was discharged. BANG! It felt like AC.
>
> > BTW, some guy built a strobe from a disposable flash and it got so
hot
> > it melted the plastic lens on front! If you're going to flash the
flash
> > at a rate higher than once every few tens of seconds, you should
reduce
> > the capacitor to 1/10 or less of its usual value. The usual cap is
> > about 120 to 160uF at 330VDC. I think they said that 22uF was a bit
on
> > the high side, maybe should be even lower.
>
> Well, if I do get something bizarre lashed up in time for July 4th it
will
> definitely break the rule of "tens of seconds" between flashes. :-O
Back in
> my tech. days I found a Gen Rad strobe tach in the equip. room.
Played around
> with it during lunch break one day. It smelled like hot steel when I
returned
> it to the tool crib. :-)
>
> Yeah, the Kodak (use AAA cell) cap is indeed 120uF. The cap. of the
AAA-driven
> ones isn't marked with any intelligence but is a bit smaller in
diameter than an
> AAA cell and about 4/5 as long.

Go here and read Kevin Attempts.. then scroll down to the Kodak Max and
other disposable schematics.
http://repairfaq.ece.drexel.edu/sam/strbfaq.htm

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