That one second seems to cause so much grief. On 1 January 2017 at 08:03, John Gardner wrote: > Very nice, Jean-Paul. IIRC, the savants are adding 1 second > > to the length of this year to correct for various perturbations? > > > ... > > > > On 12/31/16, Jean-Paul Louis wrote: > > David, the beginning of the year is fairly arbitrary. What needs to be > right > > is the duration of the year, so there is no shift. > > Earlier calendar were not exact in term of length of the year so a shif= t > > happened. > > > > Out of curiosity, why would you start the year at the winter solstice? > It is > > just another point on the elliptical orbit of the Earth, and not a > > significant point at that because of the orbit of the Earth, the tilt o= f > the > > Earth axis, and the other variations makes it almost impossible for the > > equinox to be constant either. > > > > Just $0.01, > > Jean-Paul > > N1JPL > > > > > >> On Dec 31, 2016, at 7:35 AM, David C Brown wrote: > >> > >> Never could get my head round the antipodean calendar.. Seems just > plain > >> wrong to start the year in mid-summer. Even in the North we are sever= al > >> days wrong since it is self evident that the year begins at the Winter > >> Solstice > >> > >> __________________________________________ > >> David C Brown > >> 43 Bings Road > >> Whaley Bridge > >> High Peak Phone: 01663 733236 > >> Derbyshire eMail: dcb.home@gmail.com > >> SK23 7ND web: www.bings-knowle.co.uk/dcb > >> > >> > >> > >> > >> *Sent from my etch-a-sketch* > >> > >> On 31 December 2016 at 10:32, RussellMc wrote: > >> > >>> I was going to say the same as Richard did re relay dropout. > >>> I have never had the occasion to check the following in practice - it= 's > >>> "out of my head". > >>> > >>> When the spring tension attempting to cause the relay to de-operate c= an > >>> can > >>> no longer be resisted by the attraction generated by the magnetic fie= ld > >>> the > >>> armature starts to move away from the pole face and the attraction > force > >>> almost instantly falls substantially with even a small airgap and the > >>> armature is pulled away with very little resistance, so usually quite > >>> rapidly. The change in inductance will depend on aspects of the relay > >>> design but I'd expect it could be substantial. > >>> > >>> The resultant inductive 'kick' is interesting to consider. ... delete= d > >>> ... > >>> I'm off shortly to take pictures of the midnight end/start of year > >>> fireworks. > >>> Left as an exercise for the student ... > >>> > >>> I'd be liable to (1) check what happens (2) fit some form of > suppression > >>> regardless. > >>> > >>> > >>> Russell > >>> 31 December 2016, 23:30 > >>> At the dawn of the day, edge of the empire, 1st to see the > >>> light > >>> ... > >>> > >>> > >>> > >>> > >>> > >>> On 31 December 2016 at 21:13, Justin Richards > >>> > >>> wrote: > >>> > >>>> I have a working circuit that delays the off time of a relay. > >>>> > >>>> It simply has a 10uF in parallel with 3.3M ohm that is tied between > the > >>>> Gate and Source of a BS170. The cap keeps the Gate voltage high and > >>> slowly > >>>> discharges. > >>>> > >>>> In the original design I had a protection diode across the relay coi= l. > >>>> > >>>> But I need to make changes and space is limited and was thinking the > >>> diode > >>>> can go. > >>>> > >>>> The rationale is that the coil never suddenly turns off so no > inductive > >>>> spike. The current gradually decays as the cap discharges over a 1.= 5 > >>>> min > >>>> period. > >>>> > >>>> The data sheet also shows a body diode for the BS170. > >>>> > >>>> So what say ye, is there any argument for keeping the diode in this > >>>> case. > >>>> > >>>> Cheers Justin > >>>> -- > >>>> 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 > >>> > >> -- > >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > >> View/change your membership options at > >> http://mailman.mit.edu/mailman/listinfo/piclist > > > > Just my $0.02, > > > > Jean-Paul > > N1JPL > > > > > > > > > > -- > > 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 .