May I suggest United Chemi-Con EKZM series capacitors. They are very long life electrolytics.
Data sheet: http://www.chemi-con.com/components/com_lcatalog/uploaded/8/4/4/79794946651719ba91258a.pdf They are rated 6,000, 8,000, and 10,000 hours at load (max ripple current) depending on case size. The actual life is longer at lower temperature (below 105C) and lower current. The relationship with current and temperature is non-linear. Mouser carries them: http://www.mouser.com/Search/Refine.aspx?N=1323043&Keyword=ekzm Reliability http://www.chemi-con.com/index.php?option=com_content&view=article&id=11&Itemid=17 Capacitor life http://www.chemi-con.com/index.php?option=com_content&view=article&id=12&Itemid=19 General page including the above links Understanding The Aluminum Electrolytic Capacitor http://www.chemi-con.com/index.php?option=com_content&view=article&id=13&Itemid=5 Simon ==== Date: Fri, 03 Jan 2014 13:25:10 -0700 From: Clint Turner <[email protected]> To: [email protected] Subject: [time-nuts] WWVB "repeater" (was: WWV Simulator Programs) Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sometime in the late 1990s, a friend of mine who works for a local city government asked me if there was something that I could do about some WWVB clocks located in a conference room, downtown, on a middle floor of an office building amongst computers and fluorescent lights that never managed to get the correct time. Together, we built this: http://ka7oei.blogspot.com/2013/03/getting-atomic-wwvb-clocks-to-work.html It's been in operation since it was installed, except for two occasions: - After a few weeks it quit working so my friend opened the cover of the outdoor unit to take a look. Once the water drained out, it started operating again. (He then drilled a drain hole and sealed everything else a bit better.) - Last year - after somewhat more than a decade of operation - it quit working when the electrolytics in the transformer-type "wall wart" that powered it dried out and there was several volts of AC riding atop the DC output. A new wall wart was procured and I added a large capacitor in the indoor amplifier's box as well. ====== Engineering is the art of making what you want from what you can get at a profit. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
