> I don't know what your talking about (Willis), about using a light bulb to
sense
> load output (sounds pretty "Rube Goldberg'ish" to me).

I thought his lightbulb idea was brilliant.

Incandescent bulbs respond to the RMS voltage applied to them, and you get
the information transmitted from the secondary to the primary with isolation
for free.  Just make sure you run the bulb somewhat below its rated voltage.
The lifetime of these bulbs is inversely proportional to something like the
12th power of the voltage.  You want to run it just above where it starts
producing visible light.  It might be a good idea to use a near IR
photodetector.  There are many of these available for detecting the output
of IR LEDs.  The light output of the bulb will be very non-linear with
respect to the average RMS input voltage, but that should be fine if you are
regulating to a predetermined set point.

A lot of people have made suggestions in responses to your various posts on
this topic, but you dismiss them all out of hand.  You seem to be stuck with
a particular notion of how this should be done, and anything that doesn't
match that is no good.  That's your business, but don't waste everyone's
time asking for suggestions if you aren't actually open to new ones.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.