piclist 2002\09\23\081729a >
Thread: 2-tran SMPS 5v reg now 90% efficicient!
www.piclist.com/techref/microchip/devices.htm?key=pic
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face BY : Russell McMahon email (remove spam text)



> Well I know Electronics & Wireless World are always after circuits for
their
> design ideas section, and I believe they pay something like GBP100 (handy
> number of Aus $) for circuits. It seems they are very short, even pleading
> for "back of envelope" sketch circuits which they will redraw for
> publication. Send it in with a bit of circuit operation explanation :)

If sending to E&WW ENSURE that they are aware of how radical it is in its
efficacy and simplicity (while of course not APPEARING to overdo it :-) ) -
they have occasional competitions that pay far better than their regular
fare - oscilloscopes and similart as prizes. I suspect it may be worthy of
competing in such a forum. Trouble is that if delayed for that period and it
gets wide circulation others may present it as their work to E&WW (as is
almost legitimate as ccts are often improvements on existing ones).

> Next step a buck-boost version ? I want to run the PicList Designer Board
> from my 3V cell phone charger :))))

A Buck Boost (BB) could use the same general principles BUT will need some
form of driven oscillator (or at minimum an on time delay or current tripped
switch) as the on cycle of a BB shorts the inductor output to ground and
Vout dies NOT rise during that period so the simple 1 transistor and zener
"comparator" cannot be used to terminate the on cycle.


           Russell McMahon

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