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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: Circuit Symbol
Date: Thu, 19 Dec 2024 22:39:51 -0000 (UTC)
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john larkin <jl@glen--canyon.com> wrote:
> On Thu, 19 Dec 2024 20:38:33 -0000 (UTC), Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
> 
>> john larkin <JL@gct.com> wrote:
>>> On Thu, 19 Dec 2024 09:09:54 -0600, Dennis <dennis@none.none> wrote:
>>> 
>>>> On 12/18/24 21:20, john larkin wrote:
>>>> 
>>>>> 
>>>>> I vaguely recall that they oscillated at somethig over 100 Hz. I
>>>>> powered an old car radio with 60 Hz instead of the vibrator, and the
>>>>> radio's step-up transformer ran hot.
>>>>> 
>>>> They ran at a frequency as high as reasonable for a mechanical device. 
>>>> This allowed for a smaller transformer.
>>> 
>>> Vibrating contacts were the first switching regulators. Auto
>>> generators - before alternators - used a hysteretic oscillating
>>> contact closure to drive the field coil. That was very efficient and
>>> not especially reliable.
>>> 
>>> 
>> 
>> Especially when made by Lucas. 
>> 
>> Cheers 
>> 
>> Phil Hobbs 
> 
> The brits traditionallty split their motorcycle crankcases vertically,
> to maximize oil leakage through the gaskets.
> 
> Those dumb Japanese, Honda and Kawasaki, split their crankcases
> horizontally, which required us to change the oil, not just add it.
> 
> 

Everything designed in Britain in the 1960s was legally required to leak
oil. That includes the Concorde and the QE II. 

I suspect Shell was at the bottom of it. 

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics