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From: john larkin <jlarkin_highland_tech>
Newsgroups: sci.electronics.design
Subject: Re: Omega
Date: Mon, 01 Jul 2024 16:30:42 -0700
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On Mon, 1 Jul 2024 17:49:00 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> 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 <cd@notformail.com>
>>>> wrote:
>>>>
>>>>> On Sun, 30 Jun 2024 06:05:41 -0700, john larkin
>>>>> <jlarkin_highland_tech> wrote:
>>>>>
>>>>>> On Sun, 30 Jun 2024 08:44:34 +0100, Cursitor Doom
>>>>>> <cd@notformail.com> 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.