Learn something every day, thanks people. On 3 Dec 2017 13:51, "Electron" wrote: > > I didn't know this, and it's very interesting, thank you. > > > At 14:13 2017-12-03, Jason White wrote: > >The effective capacitance of general purpose ceramic capacitors is a > >function of the DC voltage across it. In many cases the capacitance can > >drop to less than half of the rated capacitance when you get near the > >voltage rating of the part. > > > >The severity of this effect is highly dependant on the specific type of > >ceramic capacitor you have - X7R, Y5V, C0G, etc. > > > >For decoupling a 50V part will typically perform "better" than a 6.3V on= e > >of the same type and rating. > > > >See muRata's explanation: > >https://www.murata.com/en-us/support/faqs/products/ > capacitor/mlcc/char/0005 > > > >Relevant stackoverflow post "How to derate a ceramic capacitor for DC > >bias": > >https://electronics.stackexchange.com/questions/280719/how-to-derate-a > >-ceramic-capacitor-for-dc-bias > > > >On Sunday, December 3, 2017, Electron wrote: > > > >> > >> Thank you for all replies. I would like to address one in particular: > >> > >> Just one question, why 50V? Just because it's very difficult to find > 100nF > >> ceramic capacitors of lower voltage, or 50V specification is truly > needed > >> (but why? it's a 3.3V circuit after all). > >> > >> Thank you. > >> > >> Have a nice sunday, > >> Mario > >> > >> > >> At 00:15 2017-12-03, Richard Pope wrote: > >> >Mario, > >> > Yes! I won't go in to the reasons why. I bypass the Oscillator > >> >and/or oscillators and all of the digital ICs. Linear VRs are also > >> >bypassed but look at the datasheet to get the proper values. I mostly > >> >use 0.1uF 50V Ceramics. I have at times used 0.01uF 50V Ceramics. > >> >Thanks, > >> >rich! > >> > > >> >On 12/2/2017 12:18 PM, Electron wrote: > >> >> Hello, > >> >> it may seem a banal question, but as it's the first time I use an > >> external > >> >> oscillator (with integrated crystal), I am not sure. The datasheet > >> makes no > >> >> mention whatsoever to the need to use a bypass capacitor in the pow= er > >> line: > >> >> > >> >> https://global.kyocera.com/prdct/electro/product/pdf/clock_k_e.pdf > >> >> > >> >> But is this truly the case? > >> >> > >> >> Should I put a (100nF?) bypass capacitor anyway in your opinion? > >> >> > >> >> Space on the board may be used for something else otherwise, so I > don't > >> >> want to put useless components. But then again who does. > >> >> > >> >> Also, I guess there's no advantage in grounding the metalcase on th= is > >> >> integrated oscillator, like I use to do with Xtals. Maybe it's > already > >> >> grounded but I haven't received it yet.. I ask in case it's not. > >> >> > >> >> Thank you. > >> >> > >> >> Kind regards, > >> >> Mario > >> >> > >> > > >> > > >> >--- > >> >This email has been checked for viruses by Avast antivirus software. > >> >https://www.avast.com/antivirus > >> > > >> >-- > >> >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > >> >View/change your membership options at > >> >http://mailman.mit.edu/mailman/listinfo/piclist > >> > >> -- > >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > >> View/change your membership options at > >> http://mailman.mit.edu/mailman/listinfo/piclist > >> > > > > > >-- > >Jason White > >-- > >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > >View/change your membership options at > >http://mailman.mit.edu/mailman/listinfo/piclist > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .