--Apple-Mail-214-376348073 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Could one do it using a MOSFET per capacitor ? MOSFET would be turned on if voltage rating of capacitor was exceeded. R1 would be a high value such as 1 Mohm and the ratio of R1 and R2 would determine at what voltage the MOSFET Q1 began to turn on. I guess Q1 could also be a BJT. --Apple-Mail-214-376348073 Content-Disposition: inline; filename="capacitor balance schematic.gif" Content-Type: image/gif; x-unix-mode=0644; name="capacitor balance schematic.gif" Content-Transfer-Encoding: base64 R0lGODlh9QCvAOYAAAAAAAoLChISEhcYFxwcHB8gHyMjIycoJysrKy8wLzAwLzM0Mzc4Nzs8Oz9A P0NDQ0dIR0hIR0tLS09QT1BQT1NUU1dYV1hYV1tcW19gX2BgX2JjYmdoZmhoZ2pram9wb3Bxb3Jz cnZ4dnh5d3t8e3+AfoCBf4KEgoaIhoiJh4qLio6QjpCRj5OUkpaYlpqcmp6gnqChn6Kkoqaopqip p6qsqq+wrrCxr7K0sra4tri5t7u8ur7AvsDBv8LEwsbIxsjJx8rMys7QztDRz9LU0tbY1tjZ19rc 2t7g3uDi3+Lk4ubo5ejq5+rs6u7w7vDy7/3+/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5 BAQAAAAAIf/8SUNDUkdCRzEwMTIAAAP0YXBwbAIAAABtbnRyUkdCIFhZWiAH2QACAAoAFQAUAB9h Y3NwQVBQTAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA9tYAAQAAAADTLWFwcGxps56SrsNaMTlz 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I'm trying to visualize how that would > balance voltage without draining the caps at the same time. I've been > wanting to do something like this with cheap 2.5v super caps for > higher (not hundreds) voltage solar applications. > > Cheers, > Ben > > On Sun, Aug 16, 2009 at 8:50 AM, Spehro Pefhany > wrote: >> At 10:19 PM 8/15/2009, you wrote: >>> Since I have 200V caps laying around from scrapped AT computer power >>> supplies , I thought of stacking 5 of them and balancing the voltage >>> with high value resistors and 200V zeners. Is there a better way ? >> >> You'd need 25 capacitors (5 in parallel = 1000uF/200V) and then 5 of >> those sets in series to get 200uF/1kV. Resistors are the easiest way. >> If you have 5 200V zeners in series you'll get a lot of current flow >> if the voltage exceeds 1kV by a bit, whereas the caps have some >> ability >> to handle surges. >> >> Don't kill or maim (eg. blind) yourself, those voltages and energy >> storage >> amounts (100J) should be taken very, very seriously as they are >> potentially >> (so to speak) lethal. >> >>> Best regards, >> >> Spehro Pefhany --"it's the network..." "The Journey is >> the reward" >> speff@interlog.com Info for manufacturers: http://www.trexon.com >> Embedded software/hardware/analog Info for designers: http://www.speff.com >> > --Apple-Mail-214-376348073 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --Apple-Mail-214-376348073--