Let's Take A Vote...
in [Design]
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From: Phil Hobbs on 30 Jul 2010 04:27 Richard Henry wrote: > On Jul 29, 8:59 pm, Phil Hobbs > <pcdhSpamMeSensel...(a)electrooptical.net> wrote: >> George Herold wrote: >>> On Jul 29, 11:46 am, Phil Hobbs >>> <pcdhSpamMeSensel...(a)electrooptical.net> wrote: >>>> John Larkin wrote: >>>>> On Thu, 29 Jul 2010 15:10:41 +0100, John Devereux >>>>> <j...(a)devereux.me.uk> wrote: >>>>>> John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> writes: >>>>>>> On Thu, 29 Jul 2010 13:38:51 +0300 (EEST), Okkim Atnarivik >>>>>>> <Okkim.Atnari...(a)twentyfout.fi.invalid> wrote: >>>>>>>> John Larkin <jjlar...(a)highnotlandthistechnologypart.com> wrote: >>>>>>>> : Do thermals matter to you? Latching relays are fabulous. As analog >>>>>>>> : switches, no semiconductor comes close. We recently measured the wiper >>>>>>>> Interestingly, in the LHe temperature OptoMOS switches can be closed >>>>>>>> but not opened. Switch-off relies on the charge leaking away from the >>>>>>>> MOSFET gate, and this leak obviously freezes. >>>>>>> Maybe you're just not waiting long enough. A 2N7002 will keep itself >>>>>>> on or off, gate floating, for days. A cryo temps, that might extend to >>>>>>> a few million years. I'm impressed that they work at all. >>>>>>> Possibly they use a silicon resisor for the pulldown, and the >>>>>>> resistance goes way, way up when it's cold. So it might turn off in a >>>>>>> few weeks. >>>>>>> Optomos SSRs are great signal switches too. I recently blew up a bunch >>>>>>> of Clare parts, to find their voltage:current destruct limits. The >>>>>>> datasheets are horrible about that. >>>>>> Yes, pathetic for something clearly intended as an I/O component. I got >>>>>> no answer from them either about it. >>>>>> [...] >>>>> I have some crude point-of-destruction SOAR graphs if you're >>>>> interested, on their CPC1008N part. After blowing a bunch up, I >>>>> learned that you can look at waveforms and pretty accurately >>>>> anticipate second breakdown (or whatever makes them fail) just before >>>>> it happens. Plotting graphs is much faster when you don't have to >>>>> replace the part every data point, like the civil engineering students >>>>> breaking concrete beams. >>>>> John >>>> It's amazing that they remain civil--I mean, War between the States, sorry. >>>> Cheers >>>> Phil Hobbs >>>> (Recently saw the Confederate Correct-orrr episode of Rocky & Bullwinkle >>>> again. Brilliant.) >>> What? Phil I thought your nose was always in a book, not pointed at >>> the TV? >>> George H. >> I don't watch TV or movies normally, but I'm not ideological about it. >> (Of course the last movie I watched was in 1987, but that's because >> there haven't been any good ones lately.) >> >> My winsome #1 daughter (who grew up with no TV in the house, courtesy of >> her cruel and inhuman father) bought the Nth season of Rocky & >> Bullwinkle on DVD, and I happened to pass by the room she was watching >> it in. I always did like the Confederate Corrector episode. (And #2 >> daughter is winsome too, in case she's reading this.) >> >> My kids also keep me in good reading material--on Sunday, when I was >> getting ready to go on my monthly trip to NM, the same daughter gave me >> a book on the Trojan War to read on the airplane, and my son gave me his >> favourite Hemingway. >> > Which Hemingway was the favorite? The Old Man and the Sea. I'm saving it for the plane home on Saturday. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: George Herold on 30 Jul 2010 09:35 On Jul 29, 11:59 pm, Phil Hobbs <pcdhSpamMeSensel...(a)electrooptical.net> wrote: > George Herold wrote: > > On Jul 29, 11:46 am, Phil Hobbs > > <pcdhSpamMeSensel...(a)electrooptical.net> wrote: > >> John Larkin wrote: > >>> On Thu, 29 Jul 2010 15:10:41 +0100, John Devereux > >>> <j...(a)devereux.me.uk> wrote: > >>>> John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> writes: > >>>>> On Thu, 29 Jul 2010 13:38:51 +0300 (EEST), Okkim Atnarivik > >>>>> <Okkim.Atnari...(a)twentyfout.fi.invalid> wrote: > >>>>>> John Larkin <jjlar...(a)highnotlandthistechnologypart.com> wrote: > >>>>>> : Do thermals matter to you? Latching relays are fabulous. As analog > >>>>>> : switches, no semiconductor comes close. We recently measured the wiper > >>>>>> Interestingly, in the LHe temperature OptoMOS switches can be closed > >>>>>> but not opened. Switch-off relies on the charge leaking away from the > >>>>>> MOSFET gate, and this leak obviously freezes. > >>>>> Maybe you're just not waiting long enough. A 2N7002 will keep itself > >>>>> on or off, gate floating, for days. A cryo temps, that might extend to > >>>>> a few million years. I'm impressed that they work at all. > >>>>> Possibly they use a silicon resisor for the pulldown, and the > >>>>> resistance goes way, way up when it's cold. So it might turn off in a > >>>>> few weeks. > >>>>> Optomos SSRs are great signal switches too. I recently blew up a bunch > >>>>> of Clare parts, to find their voltage:current destruct limits. The > >>>>> datasheets are horrible about that. > >>>> Yes, pathetic for something clearly intended as an I/O component. I got > >>>> no answer from them either about it. > >>>> [...] > >>> I have some crude point-of-destruction SOAR graphs if you're > >>> interested, on their CPC1008N part. After blowing a bunch up, I > >>> learned that you can look at waveforms and pretty accurately > >>> anticipate second breakdown (or whatever makes them fail) just before > >>> it happens. Plotting graphs is much faster when you don't have to > >>> replace the part every data point, like the civil engineering students > >>> breaking concrete beams. > >>> John > >> It's amazing that they remain civil--I mean, War between the States, sorry. > > >> Cheers > > >> Phil Hobbs > > >> (Recently saw the Confederate Correct-orrr episode of Rocky & Bullwinkle > >> again. Brilliant.) > > > What? Phil I thought your nose was always in a book, not pointed at > > the TV? > > > George H. > > I don't watch TV or movies normally, but I'm not ideological about it. > (Of course the last movie I watched was in 1987, but that's because > there haven't been any good ones lately.) If I were going to pick one movie to see from your 20+ year hiatus it would be Peter Jacksons Lord of the Rings. (Assuming you have read the books.) Quite a work of love for many involved, and made for a BIG screen. > My winsome #1 daughter (who grew up with no TV in the house, courtesy of > her cruel and inhuman father) bought the Nth season of Rocky & > Bullwinkle on DVD, and I happened to pass by the room she was watching > it in. I always did like the Confederate Corrector episode. (And #2 > daughter is winsome too, in case she's reading this.) > > My kids also keep me in good reading material--on Sunday, when I was > getting ready to go on my monthly trip to NM, the same daughter gave me > a book on the Trojan War to read on the airplane, and my son gave me his > favourite Hemingway. I can't wait till my kids are old enough to recommend/ lend books to me. Ages 9 and 11 now, so it wont be long. My daughter has inherited my reading bug, and has been wading through the Harry Potter books this summer. Volume seven is being saved for our vacation on Cape Cod. (We leave tomorrow!) George H. > > So yeah, I read a lot, and I've been doing more normal circuit design in > the past year than I have in a looong time. Fun. :) > > Cheers > > Phil Hobbs > > -- > Dr Philip C D Hobbs > Principal > ElectroOptical Innovations > 55 Orchard Rd > Briarcliff Manor NY 10510 > 845-480-2058 > hobbs at electrooptical dot nethttp://electrooptical.net- Hide quoted text - > > - Show quoted text -
From: Phil Hobbs on 30 Jul 2010 10:47 George Herold wrote: > On Jul 29, 11:59 pm, Phil Hobbs > <pcdhSpamMeSensel...(a)electrooptical.net> wrote: >> George Herold wrote: >>> On Jul 29, 11:46 am, Phil Hobbs >>> <pcdhSpamMeSensel...(a)electrooptical.net> wrote: >>>> John Larkin wrote: >>>>> On Thu, 29 Jul 2010 15:10:41 +0100, John Devereux >>>>> <j...(a)devereux.me.uk> wrote: >>>>>> John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> writes: >>>>>>> On Thu, 29 Jul 2010 13:38:51 +0300 (EEST), Okkim Atnarivik >>>>>>> <Okkim.Atnari...(a)twentyfout.fi.invalid> wrote: >>>>>>>> John Larkin <jjlar...(a)highnotlandthistechnologypart.com> wrote: >>>>>>>> : Do thermals matter to you? Latching relays are fabulous. As analog >>>>>>>> : switches, no semiconductor comes close. We recently measured the wiper >>>>>>>> Interestingly, in the LHe temperature OptoMOS switches can be closed >>>>>>>> but not opened. Switch-off relies on the charge leaking away from the >>>>>>>> MOSFET gate, and this leak obviously freezes. >>>>>>> Maybe you're just not waiting long enough. A 2N7002 will keep itself >>>>>>> on or off, gate floating, for days. A cryo temps, that might extend to >>>>>>> a few million years. I'm impressed that they work at all. >>>>>>> Possibly they use a silicon resisor for the pulldown, and the >>>>>>> resistance goes way, way up when it's cold. So it might turn off in a >>>>>>> few weeks. >>>>>>> Optomos SSRs are great signal switches too. I recently blew up a bunch >>>>>>> of Clare parts, to find their voltage:current destruct limits. The >>>>>>> datasheets are horrible about that. >>>>>> Yes, pathetic for something clearly intended as an I/O component. I got >>>>>> no answer from them either about it. >>>>>> [...] >>>>> I have some crude point-of-destruction SOAR graphs if you're >>>>> interested, on their CPC1008N part. After blowing a bunch up, I >>>>> learned that you can look at waveforms and pretty accurately >>>>> anticipate second breakdown (or whatever makes them fail) just before >>>>> it happens. Plotting graphs is much faster when you don't have to >>>>> replace the part every data point, like the civil engineering students >>>>> breaking concrete beams. >>>>> John >>>> It's amazing that they remain civil--I mean, War between the States, sorry. >>>> Cheers >>>> Phil Hobbs >>>> (Recently saw the Confederate Correct-orrr episode of Rocky & Bullwinkle >>>> again. Brilliant.) >>> What? Phil I thought your nose was always in a book, not pointed at >>> the TV? >>> George H. >> I don't watch TV or movies normally, but I'm not ideological about it. >> (Of course the last movie I watched was in 1987, but that's because >> there haven't been any good ones lately.) > > If I were going to pick one movie to see from your 20+ year hiatus it > would be Peter Jackson�s �Lord of the Rings�. (Assuming you have read > the books.) Quite a work of love for many involved, and made for a > BIG screen. Thanks. I've read The Hobbit, TLOTR, and the Silmarillion many times--I got TLOTR in one big thick volume for Christmas when I was 16, and proceeded to read it all the way through, straight, twice. Love at first sight, and I've never wavered. I'm a big fan of fairy stories in general--good ones, that is, ones that follow the rules of the genre and take the story seriously, *as a story*, and not merely a medium for politics, or artistic theory, or score-settling. Tolkien's essays ]Mythopoeia' and 'On Fairy Stories' are a good way in, for people who don't know the difference between a fairy story and a straightforward fantasy on one hand, and a parody on the other. [Hint: Spenser, Lord Dunsany, Charles Williams, Tolkien, Lewis, and Peake, good, Marion Zimmer Bradley and Evangeline Walton, bad, Lloyd Alexander, somewhere in between. I enjoyed some of Bradley's other stuff back in the day, but her Arthuriad is a disaster--full of gender-feminist axe-grinding and with no sense for the story whatsoever. #1 daughter went to Washington College, and her Tolkien professor there has a web site with a bunch of canned lectures and stuff--it's called TheTolkienProfessor.com, strange to tell. Good stuff if you're interested in that sort of thing--very engaging and fun. I also like Homer, Virgil, and especially Dante, who is as good a theologian as he is a poet, and is therefore very widely misunderstood. Lots of folks only read the Inferno for the thrill, whereas the heart of the Commedia is the Purgatorio and Paradiso. At one time I also liked Norse sagas, but they kind of palled when I was 20 or so. It's one of my life's regrets that I quit taking Latin in grade 9, and never learned any Greek or Italian at all. I've been gradually learning Middle English (one day I hope to be able to actually write it), and am picking away at a little bit of Anglo-Saxon, though nothing serious. I have a number of AS texts printed with the original on the left-hand pages and a translation on the right. Plus I have all this fun technical stuff to do, that I usually talk about here. So I rarely get bored--except when watching moving pictures for longer than about 15 minutes, which will do it every time. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: Richard Henry on 30 Jul 2010 10:57 On Jul 30, 6:35 am, George Herold <gher...(a)teachspin.com> wrote: > On Jul 29, 11:59 pm, Phil Hobbs > > > > <pcdhSpamMeSensel...(a)electrooptical.net> wrote: > > George Herold wrote: > > > On Jul 29, 11:46 am, Phil Hobbs > > > <pcdhSpamMeSensel...(a)electrooptical.net> wrote: > > >> John Larkin wrote: > > >>> On Thu, 29 Jul 2010 15:10:41 +0100, John Devereux > > >>> <j...(a)devereux.me.uk> wrote: > > >>>> John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> writes: > > >>>>> On Thu, 29 Jul 2010 13:38:51 +0300 (EEST), Okkim Atnarivik > > >>>>> <Okkim.Atnari...(a)twentyfout.fi.invalid> wrote: > > >>>>>> John Larkin <jjlar...(a)highnotlandthistechnologypart.com> wrote: > > >>>>>> : Do thermals matter to you? Latching relays are fabulous. As analog > > >>>>>> : switches, no semiconductor comes close. We recently measured the wiper > > >>>>>> Interestingly, in the LHe temperature OptoMOS switches can be closed > > >>>>>> but not opened. Switch-off relies on the charge leaking away from the > > >>>>>> MOSFET gate, and this leak obviously freezes. > > >>>>> Maybe you're just not waiting long enough. A 2N7002 will keep itself > > >>>>> on or off, gate floating, for days. A cryo temps, that might extend to > > >>>>> a few million years. I'm impressed that they work at all. > > >>>>> Possibly they use a silicon resisor for the pulldown, and the > > >>>>> resistance goes way, way up when it's cold. So it might turn off in a > > >>>>> few weeks. > > >>>>> Optomos SSRs are great signal switches too. I recently blew up a bunch > > >>>>> of Clare parts, to find their voltage:current destruct limits. The > > >>>>> datasheets are horrible about that. > > >>>> Yes, pathetic for something clearly intended as an I/O component. I got > > >>>> no answer from them either about it. > > >>>> [...] > > >>> I have some crude point-of-destruction SOAR graphs if you're > > >>> interested, on their CPC1008N part. After blowing a bunch up, I > > >>> learned that you can look at waveforms and pretty accurately > > >>> anticipate second breakdown (or whatever makes them fail) just before > > >>> it happens. Plotting graphs is much faster when you don't have to > > >>> replace the part every data point, like the civil engineering students > > >>> breaking concrete beams. > > >>> John > > >> It's amazing that they remain civil--I mean, War between the States, sorry. > > > >> Cheers > > > >> Phil Hobbs > > > >> (Recently saw the Confederate Correct-orrr episode of Rocky & Bullwinkle > > >> again. Brilliant.) > > > > What? Phil I thought your nose was always in a book, not pointed at > > > the TV? > > > > George H. > > > I don't watch TV or movies normally, but I'm not ideological about it. > > (Of course the last movie I watched was in 1987, but that's because > > there haven't been any good ones lately.) > > If I were going to pick one movie to see from your 20+ year hiatus it > would be Peter Jacksons Lord of the Rings. (Assuming you have read > the books.) Quite a work of love for many involved, and made for a > BIG screen. > I fell asleep in all three. Beautiful Mind, Schindler's List, Unforgiven, Million Dollar Baby all won Academy Awards in that period and are on my must-see list.
From: Richard Henry on 30 Jul 2010 11:10
On Jul 30, 1:27 am, Phil Hobbs <pcdhSpamMeSensel...(a)electrooptical.net> wrote: > Richard Henry wrote: > > On Jul 29, 8:59 pm, Phil Hobbs > > <pcdhSpamMeSensel...(a)electrooptical.net> wrote: > >> George Herold wrote: > >>> On Jul 29, 11:46 am, Phil Hobbs > >>> <pcdhSpamMeSensel...(a)electrooptical.net> wrote: > >>>> John Larkin wrote: > >>>>> On Thu, 29 Jul 2010 15:10:41 +0100, John Devereux > >>>>> <j...(a)devereux.me.uk> wrote: > >>>>>> John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> writes: > >>>>>>> On Thu, 29 Jul 2010 13:38:51 +0300 (EEST), Okkim Atnarivik > >>>>>>> <Okkim.Atnari...(a)twentyfout.fi.invalid> wrote: > >>>>>>>> John Larkin <jjlar...(a)highnotlandthistechnologypart.com> wrote: > >>>>>>>> : Do thermals matter to you? Latching relays are fabulous. As analog > >>>>>>>> : switches, no semiconductor comes close. We recently measured the wiper > >>>>>>>> Interestingly, in the LHe temperature OptoMOS switches can be closed > >>>>>>>> but not opened. Switch-off relies on the charge leaking away from the > >>>>>>>> MOSFET gate, and this leak obviously freezes. > >>>>>>> Maybe you're just not waiting long enough. A 2N7002 will keep itself > >>>>>>> on or off, gate floating, for days. A cryo temps, that might extend to > >>>>>>> a few million years. I'm impressed that they work at all. > >>>>>>> Possibly they use a silicon resisor for the pulldown, and the > >>>>>>> resistance goes way, way up when it's cold. So it might turn off in a > >>>>>>> few weeks. > >>>>>>> Optomos SSRs are great signal switches too. I recently blew up a bunch > >>>>>>> of Clare parts, to find their voltage:current destruct limits. The > >>>>>>> datasheets are horrible about that. > >>>>>> Yes, pathetic for something clearly intended as an I/O component. I got > >>>>>> no answer from them either about it. > >>>>>> [...] > >>>>> I have some crude point-of-destruction SOAR graphs if you're > >>>>> interested, on their CPC1008N part. After blowing a bunch up, I > >>>>> learned that you can look at waveforms and pretty accurately > >>>>> anticipate second breakdown (or whatever makes them fail) just before > >>>>> it happens. Plotting graphs is much faster when you don't have to > >>>>> replace the part every data point, like the civil engineering students > >>>>> breaking concrete beams. > >>>>> John > >>>> It's amazing that they remain civil--I mean, War between the States, sorry. > >>>> Cheers > >>>> Phil Hobbs > >>>> (Recently saw the Confederate Correct-orrr episode of Rocky & Bullwinkle > >>>> again. Brilliant.) > >>> What? Phil I thought your nose was always in a book, not pointed at > >>> the TV? > >>> George H. > >> I don't watch TV or movies normally, but I'm not ideological about it. > >> (Of course the last movie I watched was in 1987, but that's because > >> there haven't been any good ones lately.) > > >> My winsome #1 daughter (who grew up with no TV in the house, courtesy of > >> her cruel and inhuman father) bought the Nth season of Rocky & > >> Bullwinkle on DVD, and I happened to pass by the room she was watching > >> it in. I always did like the Confederate Corrector episode. (And #2 > >> daughter is winsome too, in case she's reading this.) > > >> My kids also keep me in good reading material--on Sunday, when I was > >> getting ready to go on my monthly trip to NM, the same daughter gave me > >> a book on the Trojan War to read on the airplane, and my son gave me his > >> favourite Hemingway. > > > Which Hemingway was the favorite? > > The Old Man and the Sea. I'm saving it for the plane home on Saturday. > > Cheers > > Phil Hobbs > > -- > Dr Philip C D Hobbs > Principal > ElectroOptical Innovations > 55 Orchard Rd > Briarcliff Manor NY 10510 > 845-480-2058 > hobbs at electrooptical dot nethttp://electrooptical.net Good choice. Another I liked was True at First Light, which was released after his death, completed from his notes and papers by his wife and son. |