Greetings all,

This application uses an SE and the stored energy in a coil to light
a LED. The most efficient way to do that is to measure the point at
which the current in the coil has reached the required peak value and
then turn off the output transistor. This is normally done by
detecting the point at which the output transistor can no longer sink
the coil current and comes out of saturation. I will post an example
later tonight.

wilf




--- In beam@yahoogroups.com, "Joseph Charles" <jodicalhon@...> wrote:
>
> As might be expected, Wilf has the answer.
>
> See this post from JWG regarding a similar problem:
>
> http://tech.groups.yahoo.com/group/beam/message/53727
>
> Cheers,
>
> Jo
>
> P.S. I've taken the liberty of cutting and pasting a possible way to
> go. (Err...I think I've got the idea...)
>
> http://tech.groups.yahoo.com/group/beam/files/Jo%
20C/EZ1381engine.GIF
>
>
> --- In beam@yahoogroups.com, "Tom Elner" <computerfreaks@> wrote:
> >
> > Hi all,
> >
> >
> > Someone has posted a question on my forum of which I am not sure
the
> > best answer:
> >
> > http://computerfreaks.myfreeforum.org/sutra114.php#114
> >
> >
> > Basically a 1381 solarengine circuit with a coil instead of a
motor,
> > is firing once and then never again. It appears the the 3906 is
> > staying on. The coil has an LED reversed bias across it to act
as a
> > freewheeling diode.
> >
> >
> > Can anyone help this guy?
> >
> >
> > Thanks
> >
> > Tom
> >
>