On 11/8/06, Xiaofan Chen <xiaofanc@gmail.com> wrote:
> On 11/7/06, Russell McMahon <apptech@paradise.net.nz> wrote:
> > God's/my "GSR"* simple switching regulator circuit also features here.
> >
> >    http://sound.westhost.com//appnotes/an006.htm
> >
> > And in a constant current version here
> >
> >        http://sound.westhost.com//appnotes/an003.htm
> >
> > Over 10,000 of these have been built so far as a 13v to 200V input /
> > 12V output power supply for an exercise machine.
> >
> > Original design was imparted on 24 Feb 2001 at about 10:43am :-)
>
> I believe many more sensors have been sold before your date
> using almost exact the same three-transistor design. I've
> seen circuit designed by SICK (the leading photoelectric sensor
> vendor) before. The application is the same: universal power
> supply AC/DC sensors (typically 12V-240VDC and 12/24V-240V AC).
>

By the way, the SICK design should be dated before 1992 since the
sensor was available before that year.
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