Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 01 Jul 2024 23:30:42 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: Omega Date: Mon, 01 Jul 2024 16:30:42 -0700 Message-ID: References: <6682e9e7$0$2873014$882e4bbb@reader.netnews.com> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 102 X-Trace: sv3-bXmqdR/SzpoLqah/qjfVi31O0PpAAI2V58JhqJv2NI8YVOj5T9UZ7FrY1d9biZXweUyX1xsz2HWDrEr!7x1bEiwA7N95zDFxaOrb7yViqrV6btDwelBn0lhRz5DTXD31Efpdo90iNMiyoq2sZECYXHp4gRTU!LmMfBQ== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 5438 On Mon, 1 Jul 2024 17:49:00 -0000 (UTC), Cursitor Doom wrote: >On Mon, 1 Jul 2024 13:39:51 -0400, bitrex wrote: > >> On 6/30/2024 12:45 PM, Cursitor Doom wrote: >>> On Sun, 30 Jun 2024 07:38:19 -0700, john larkin wrote: >>> >>>> On Sun, 30 Jun 2024 14:23:24 +0100, Cursitor Doom >>>> wrote: >>>> >>>>> On Sun, 30 Jun 2024 06:05:41 -0700, john larkin >>>>> wrote: >>>>> >>>>>> On Sun, 30 Jun 2024 08:44:34 +0100, Cursitor Doom >>>>>> wrote: >>>>>> >>>>>>> Gentlemen, >>>>>>> >>>>>>> For more decades than I care to remember, I've been using formulae >>>>>>> such as Xc= 1/2pifL, Xl=2pifC, Fo=1/2pisqrtLC and such like without >>>>>>> even giving a thought as to how omega gets involved in so many >>>>>>> aspects of RF. BTW, that's a lower-case, small omega meaning >>>>>>> 2*pi*the-frequency-of-interest rather than the large Omega which is >>>>>>> already reserved for Ohms. How does it keep cropping up? What's so >>>>>>> special about the constant 6.283 and from what is it derived? >>>>>>> Just curious... >>>>>> >>>>>> 2 * pi. >>>>>> >>>>>> If a thing 1 unit in radius rotates one time per second, its >>>>>> circumference is 2pi so its rim velocity is 2pi/second. >>>>>> >>>>>> A capacitor current depends on the rate of change of the voltage. >>>>>> >>>>>> I = CV/T >>>>>> >>>>>> A 1 volt peak 1 Hz sine wave has its max rate of change at the zero >>>>>> crossing, and that rate is 2pi volts/second. So 1 farad driven with >>>>>> a 1 Hz 1 volt peak sine wave has a peak current of 2pi amps. >>>>>> >>>>>> You can Spice all that to get a feel for things. >>>>> >>>>> Thanks, John. This is the fundamental stuff I just overlook since the >>>>> need for it so rarely crops up. It's easier to take an abstraction >>>>> level higher and lose all the vital detail in the process. >>>> >>>> It's good to understand the basics, but I mostly use Spice these days, >>>> even for simple things like voltage dividers. >>>> >>>>> You're up early today. Off to church are we? >>>> >>>> No, I just woke up early with a zillion ideas. That happens some >>>> times. >>>> >>>> Today is San Francisco Pride Day (Dikes on Bikes and such) so it's a >>>> good day to stay close to home. Traffic and parking and everything >>>> will be a nightmare. >>>> >>>> https://sfpride.org/parade >>>> >>>> https://www.dropbox.com/scl/fi/j698pjo7jxm152zuzu4dx/ >Pink_Triangle.jpg? >>> rlkey=n4xinzzm39bms9w04syb7egkx&raw=1 >>> >>> I went to one of those once in Berlin when I lived there. God almighty! >>> I've never seen such a complete and utter freak show in my entire life. >>> I just stood there gaping open-mouthed at the procession. It must have >>> been pretty obvious to any of those weirdos on the floats that I wasn't >>> there to celebrate them! I just find it bizarre that parents actually >>> take their kids to see this sort of thing and they're all waving their >>> rainbow flags and whatnot. No kids of mine would be allowed within a >>> million miles of an event like that. No wonder the God-fearing folks >>> reckon the world's going to hell in a handbasket. :( >> >> Could always move to places that tolerate that sort of stuff. Saudi >> Arabia. Moscow. Abilene, Texas. Lots of options. >> >> But Mr. Larkin seems to prefer it in San Fran and you seem to prefer >> flitting about western Europe, interesting. > >Well, I did warn John about moving to SF many years ago as I could tell >the way it was going, but he went ahead anyway and seems to have an >uncanny ability to only notice the nice side of the place (mainly by not >venturing downtown, it seems). You warned me? What's your real name? When I decided to move to SF, my friends said "But it's full of gay guys" to which I replied "and lots of smart beautiful women." Do the math on that. Right, we avoid the tourist traps and homeless encampments. The hills separate SF into a collection of villages, with even different weather. It's a great place to be weird. People get it. But 2*pi is still 2*pi even here.