This is a great list.  I have learned more from reading this list than from
the weeks I spent reading PIC books.

Here's my question:

I recently salvaged a nice power supply from an industrial instrument to use
as my power supply for my PIC experiments. It has 9 outputs as follows:
+24V 1.5A
ground
+ 5V 5A
+ 5V 5A
+ 12V 1A fl
-12V 1A fl
+12V 1A fl
-12V 1A fl
P.F.

What is the function of the P.F. output (is 5V) and what does the "fl" mean
on the 12V outputs.  Ground is used to close the 24, 5, and P.F. circuits but
none of the 12V circuits show any voltage when referenced to ground.  They do
show 12V though when the +12V is referenced to its CORRESPONDING -12V.

Any help would be greatly appreciated.

Fernando