Bill WB6BNQ wrote: > Dear Bruce, > > I was trying to make a bit of humor, admittedly at your expense, playing on > "time" and > "nuts." I would have included the "internet" smilelys, or whatever you call > them, but > I do not know them and would not know which to apply at the end of my > sentences. Such > would have noted it was not an attack, which truly it was not. > > I've got a fairly thick skin, I often find some humour at my expense amusing. > You are not the only one who is cryptic with some of their responses. You > just happen > to be the most prolific, on the surface, and the easiest, in this case, to > poke fun at > (so to speak). As you so correctly point out, it really does require knowing > the > intended purposes and application for a circuit before deciding upon a > selection of > parts. > > I see you took my attempt at being a comedian in the wrong light, for that I > apologize. > I saw and appreciated the humour, but thought there might perhaps also be a serious underlying question. > 73....Bill....WB6BNQ > > > Bruce
> Bruce Griffiths wrote: > > >> Bill >> >> In general, for frequencies of around 10MHz and below 2N3904's and >> 2N3906's work well at least for collector currents < 40mA or so. >> In some circuits these will even work well to around 100MHz albeit with >> higher noise and distortion. >> For higher frequencies faster transistors are usually advisable. >> >> The choice of comparator depends on what logic it is intended to drive. >> With logic supplies as low as 1.8V for some FPGAs and CPLDs its >> difficult to give a part that suits all applications. >> >> If in doubt ask (off line if you prefer) and I'll find a part (or parts) >> that you can easily obtain that suits your particular application. >> >> Bruce >> >> WB6BNQ wrote: >> >>> Jim, >>> >>> I totally disagree ! The "crystal orientations" thread has been most >>> informative, particularly with regard to the link showing the internals of >>> the hp >>> oscillator. A short section of the "plumbing" was helpful, although it got >>> a bit >>> out of hand. >>> >>> I think the point of the "Timenuts" list is to provide a medium for >>> discussion of >>> topics that help people improve their efforts at achieving higher precision >>> in >>> all facets of time keeping. All of the list members are not on the same >>> level >>> whether it is education, technical or even monetary ability. Thus, many >>> are here >>> for learning and to prevent poor choices and expensive mistakes from others >>> that >>> have gone before them. >>> >>> If you want to complain about something, then jump on Bruce for never >>> suggesting >>> what "transistor/opamp/comparator" part number would be most appropriate >>> for his >>> circuits. I go "nuts" time and time again over that small point because I >>> do not >>> have enough in-depth knowledge to fully make the appropriate choices. >>> Hmmmm, >>> maybe that is why it is called "Timenuts" list ? A place for Bruce to drive >>> you >>> "nuts" time and time again. >>> >>> Who would have thought ? >>> >>> Bill....WB6BNQ >>> >>> >>> The point being that >>> >>> Jim Palfreyman wrote: >>> >>> >>> >>>> All, >>>> >>>> Can you please follow John's instructions and stay on topic. >>>> >>>> All this new age pseudo-science talk of "crystal orientations" and "g >>>> sensitivity" does not belong in this group. >>>> >>>> Thank you. >>>> >>>> Jim >>>> >>>> 2009/7/9 Robert Atkinson <robert8...@yahoo.co.uk> >>>> >>>> >>>> >>>>> Hi Antonio, >>>>> Have a look at http://www.realhamradio.com/GPS-oven-journey.htm for >>>>> internal pictures. >>>>> The crystal element is a disc mounted parallel to the flat end of the can, >>>>> see http://www.bliley.com/index_088.htm >>>>> >>>>> Robert G8RPI. >>>>> >>>>> --- On Wed, 8/7/09, iov...@inwind.it <iov...@inwind.it> wrote: >>>>> >>>>> >>>>> >>>>>> From: iov...@inwind.it <iov...@inwind.it> >>>>>> Subject: Re: [time-nuts] 10811 crystal orientation >>>>>> To: "time-nuts" <time-nuts@febo.com> >>>>>> Date: Wednesday, 8 July, 2009, 7:01 PM >>>>>> Hi Chad, >>>>>> >>>>>> the sketch you sent seems to indirectly answer my question, >>>>>> as I could rely on the axis of minimum "g" sensitivity to >>>>>> orient my three 10811 assemblies, but for my purpose it >>>>>> seems that there is still a margin of ambiguity. I don't >>>>>> take from the sketch how the crystal is actually fitted >>>>>> (vertically?) into the case. As far as I know, "g" >>>>>> sensitivity depends mainly on how the crystal "weights" on >>>>>> its suspensions (contacts), and this is secondary for me. >>>>>> So, I would be pleased to know how the crystal is actually >>>>>> oriented, say regardless of the "g" sensitivity. >>>>>> >>>>>> Thanks. >>>>>> Antonio I8IOV >>>>>> >>>>>> >>>>>> >>>>>>> Hi Antonio, >>>>>>> >>>>>>> Please see the attached diagram from the 10811A >>>>>>> >>>>>>> >>>>>> service manual. Minimum and >>>>>> >>>>>> >>>>>>> maximum G-sensitivity axes are shown. Since the >>>>>>> >>>>>>> >>>>>> other variants of 10811 are >>>>>> >>>>>> >>>>>>> all internally constructed the same, I would not >>>>>>> >>>>>>> >>>>>> expect a difference for the >>>>>> >>>>>> >>>>>>> -60111. >>>>>>> >>>>>>> - Chad. >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Wed, Jul 8, 2009 at 10:27 AM, iov...@inwind.it >>>>>>> >>>>>>> >>>>>> <iov...@inwind.it> >>>>>> wrote: >>>>>> >>>>>> >>>>>>>> Dear all, >>>>>>>> >>>>>>>> does anybody out there know the orientation of >>>>>>>> >>>>>>>> >>>>>> the crystal faces relative >>>>>> >>>>>> >>>>>>>> to the outer case in a 10811-60111? >>>>>>>> >>>>>>>> (The sense of the question is that we are >>>>>>>> >>>>>>>> >>>>>> considering building a 3-axis >>>>>> >>>>>> >>>>>>>> apparatus for gravity-related tests. Note, based >>>>>>>> >>>>>>>> >>>>>> on our tentative >>>>>> >>>>>> >>>>>>>> modelization, crystals are not requested to work >>>>>>>> >>>>>>>> >>>>>> as accelerometers). >>>>>> >>>>>> >>>>>>>> Antonio I8IOV >>>>>>>> >>>>>>>> >>>>>> _______________________________________________ >>>>>> time-nuts mailing list -- time-nuts@febo.com >>>>>> To unsubscribe, go to >>>>>> >>>>>> >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> >>>>> >>>>>> and follow the instructions there. >>>>>> >>>>>> >>>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@febo.com >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>>> >>>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.