Interesting. What about a ceramic capacitor? For example, there is this 400V AC X2 <https://www.digikey.com/product-detail/en/vishay-cera-mite/20VLP10-R/BC3228-ND/2825298> cap on digikey, though quite large at almost 25mm diameter.
On Thursday, May 2, 2019 at 2:06:25 PM UTC-4, Dekatron42 wrote: > > One thing about the type of power supply that relies on a capacitor in the > manner that the clock design in the link from www.dos4ever.com is that > the capacitor will degrade over time for every voltage spike on the mains, > this is as designed by the capacitor manufacturers but it also means that > the capacitance will become lower over time as the self-healing properties > are not 100% so the voltage you get from this power supply will get lower > over time. There was a big problem with this a few years ago as the > capacitors that were manufactured over a time degraded faster than designed > so many home appliances went dead long before they were intended to (I > worked with smart electricity meters that were also affected by this > problem and it took a long time to find out that it was these capacitors > that were the problem). Finally they found out that there were > manufacturing problems of these polypropylene capacitors that meant that > they degraded faster than designed. The costs for repairing the electricity > meters were in part covered by the capacitor manufacturers but I guess that > it was a loss to everyone in the end. So you should count on the capacitor > giving up at some point, but modern capacitors nowadays take some of this > into account as the manufacturers realized that they had to change the > manufacturing process to make better and more reliable capacitors (but > since cost has always been the driving point for these types of components > they might not be so much better anyway). > > Do some googling on for instance "smart meter capacitive power supply > problems" and you'll see some discussions and documents on this. > > Choose a specially designed capacitor for this use and your power supply > will live a lot longer and don't just put any capacitor in there! > > /Martin > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/2409dd16-ca4e-47b0-803b-e6272c32ede0%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
