> This circuit has been modified at times to take a much higher input volta=
ge:
> http://www.romanblack.com/smps/smps.htm

The "Black Converter" is cost efficient and compact but is far less
regulated than 'my' 3 transistor GSR. The difference is significant in
real world applications.

Roman produced  his circuit based on a relay driver circuit suggested
by Richard Prosser in response to a long ago PICLIst design challenge
where I put my design up as straw-man. If the regulation  is
acceptable Roman's wins out slightly over mine on price.



    Russell McMahon
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.