Peter L. Peres wrote: > >> .I have mixed experiences with 78S40. Unless you > >> guarantee a minimum load it will be 'chaotic' in operation. > > > > Why not use some Microchip stuff: > >TC115 or TC120 PFM/PWM Step-Up DC/DC Controllers? > > Please quote a second source for those parts, and a shop that > sells these in small quantity (<20 pcs) without steep markup. > Otherwise I aggree, they are good parts. Just not suitable for > small runs and prototyping w/o large buy commitment. In Ukraine, Dnepropetrovsk: http://www.microchip.com.ua/sklad/price.zip (Russian) TC115501EMTTR - $1,22 (ones) Your country has Consulate there. A lot of people go through it to your country each day still. You may ask their relatives to arrange chips' delivery. Sorta business. I can send further information privately (assuming all my postings are likely to be red by "our friends ." [|l:-( (Please, do not download this file without need. They can't sell abroad, I think. They've closed Home Page already may be due to a traffic overload. If they blacklist me, I'll be forced to shift to AVR, more common and cheaper here.) Mike c(|:-) -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics