On Wed, 23 Oct 2013 17:45:25 -0700 (PDT), George Herold <gherold@teachspin.com>
wrote:
>On Monday, October 21, 2013 11:07:04 PM UTC-4, John Larkin wrote:
>> On Mon, 21 Oct 2013 09:39:38 -0700, Joerg <invalid@invalid.invalid> wrote:
>>
>>
>
>> Speaking of bizarre anachronisms, we recently watched the new
>> "Much Ado About Nothing", in modern dress but original Shakespearian dialogue,
>> filmed in b+w in a suburban LA house. Lots of cell phones and neckties.
>> Disconcerting but good.
>A Joss Whedon production I think, my wife and daughter love Joss Whedon.
Yup. It was filmed in his house.
--
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Reply by josephkk●October 23, 20132013-10-23
On Sun, 20 Oct 2013 15:09:56 -0500, John S <Sophi.2@invalid.org> wrote:
>On 10/20/2013 2:56 PM, Joerg wrote:
>> John S wrote:
>>> On 10/19/2013 6:36 PM, Joerg wrote:
>>
>> [...]
>>
>>
>>>> I'd like to get into beer brewing some day. When I did that last =
time as
>>>> a student in Germany I almost had more fun that when designing
>>>> electronics (which I did a lot while studying for my masters). =
Nowadays,
>>>> after designing the umpteenth switch mode converter that can get a =
bit
>>>> old. It's only fun if there is something in the mix where people =
have
>>>> said "it can't be done". That's when my fun level meter goes to =
120%.
>>>>
>>>
>>> I dunno, Joerg. Isn't brewing sort of like watching paint dry? My =
desire
>>> is that you poke something and can get an almost immediate response. =
I
>>> obviously don't have your patience. Which is also my shortcoming.
>>
>>
>> For brewing one must have patience. Occasionally stuff has to just sit
>> there for a couple of weeks, your gear must be squeaky clean and
>> sterilized, you can't cut corners. Else you might ruin a day's worth =
of
>> work in minutes. When we brewed beer back in my university days we =
were
>> rather busy for a whole day and then again when it was time to bottle.
>> But we made sure there was a crate left over from last time and that
>> none of us had to drive that evening.
>>
>
>Yeah, I know. But, I can't sit still for a day let alone a couple of=20
>weeks. I would die from boredom. I'm just not up to it. Others see it as=
=20
>a challenge. It is why we are so diverse. Thanks, Momma (Nature), for =
that.
When i run a batch, it is almost like a couple of holidays a few weeks
apart. That is the main reason it is a hobby. Whip up the brew, go back
to electronics and whatever else for a couple of weeks, bottle it up or
set it up on tap or most likely both. The bottles are for friends that
can't just come over any time. I do require that the bottles be returned
to use again.
?-)
Reply by George Herold●October 23, 20132013-10-23
On Monday, October 21, 2013 11:07:04 PM UTC-4, John Larkin wrote:
> On Mon, 21 Oct 2013 09:39:38 -0700, Joerg <invalid@invalid.invalid> wrote:
>
>
> Speaking of bizarre anachronisms, we recently watched the new
> "Much Ado About Nothing", in modern dress but original Shakespearian dialogue,
> filmed in b+w in a suburban LA house. Lots of cell phones and neckties.
> Disconcerting but good.
A Joss Whedon production I think, my wife and daughter love Joss Whedon.
George H.
>
>
>
>
> --
>
>
>
> John Larkin Highland Technology Inc
>
> www.highlandtechnology.com jlarkin at highlandtechnology dot com
>
>
>
> Precision electronic instrumentation
>
> Picosecond-resolution Digital Delay and Pulse generators
>
> Custom timing and laser controllers
>
> Photonics and fiberoptic TTL data links
>
> VME analog, thermocouple, LVDT, synchro, tachometer
>
> Multichannel arbitrary waveform generators
>
> Phil Hobbs wrote:
>>
>> Since I turned 50 I'm entitled to wear a vintage plate myself. ;)
>>
>> And I love books. I have thousands of them, and have chucked out or
>> given away more thousands. I buy probably half a dozen a month, mostly
>> fine or VG condition used hardbacks. This month I got a book on
>> electromagnetic shock lines and one on hypersonic flow visualization.
>> Fun stuff.
>>
>> You can see the aforementioned table and bookshelf in my virtual lab
>> tour, http://electrooptical.net/www/EOILab/EOILab.html .
>>
>> It looks pretty much like that, except that I have a bunch more
>> furniture (two big lab benches and a table in the whiteboard/reception
>> area, plus some more in the admin/layout space). I also have way more
>> equipment. I've been meaning to replace the pictures, but the lab
>> hasn't been that clean since 2011. ;)
>
>
> Easier to move, than clean? ;-)
>
>
Something like that. Mostly it's just always being in the middle of
several things at once.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
Reply by Michael A. Terrell●October 23, 20132013-10-23
Phil Hobbs wrote:
>
> I also have a Keithley 405 "Micro-Microammeter" (most sensitive range is
> 100 fA FS). Not to be too pico, er, picky.
I bought a couple HP 3455A meters that need repaired. Looks like it'll
be loads of fun, and they have IEEE-488 interfaces!
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
Reply by Michael A. Terrell●October 23, 20132013-10-23
Phil Hobbs wrote:
>
> Since I turned 50 I'm entitled to wear a vintage plate myself. ;)
>
> And I love books. I have thousands of them, and have chucked out or
> given away more thousands. I buy probably half a dozen a month, mostly
> fine or VG condition used hardbacks. This month I got a book on
> electromagnetic shock lines and one on hypersonic flow visualization.
> Fun stuff.
>
> You can see the aforementioned table and bookshelf in my virtual lab
> tour, http://electrooptical.net/www/EOILab/EOILab.html .
>
> It looks pretty much like that, except that I have a bunch more
> furniture (two big lab benches and a table in the whiteboard/reception
> area, plus some more in the admin/layout space). I also have way more
> equipment. I've been meaning to replace the pictures, but the lab
> hasn't been that clean since 2011. ;)
Easier to move, than clean? ;-)
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
Reply by Phil Hobbs●October 23, 20132013-10-23
On 10/22/2013 02:19 PM, John Larkin wrote:
> On Tue, 22 Oct 2013 09:56:04 -0400, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> On 10/21/2013 05:13 PM, Spehro Pefhany wrote:
>>> On Mon, 21 Oct 2013 15:28:33 -0400, Phil Hobbs
>>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>>
>>>> On 10/21/2013 02:34 PM, RobertMacy wrote:
>>>>> On Mon, 21 Oct 2013 10:55:11 -0700, Joerg <invalid@invalid.invalid> wrote:
>>>>>
>>>>>>> ...snip...
>>>>>> I raise you one: I have a megacycle meter 8-)
>>>>>>
>>>>>> This one:
>>>>>>
>>>>>> http://www.ohio.edu/people/postr/bapix/Dip_59.htm
>>>>>>
>>>>>
>>>>> That's too bad you won't be able to use it, since it measures megacycles
>>>>> and megacycles no longer exist. Unless you can find some equipment that
>>>>> produces megacycles, like...perhaps I can help, I have an original pair
>>>>> of WWII walkietalkies!
>>>>>
>>>>> You have NO idea how long it took me to stop saying
>>>>> megacycles/kilocycles and start saying megaHertz/kiloHertz.
>>>>
>>>> I also have a Keithley 405 "Micro-Microammeter" (most sensitive range is
>>>> 100 fA FS). Not to be too pico, er, picky.
>>>>
>>>> Cheers
>>>>
>>>> Phil Hobbs
>>>
>>> I can remember caps (probably out of obsolete equipment at the time)
>>> being marked in MMF.
>>>
>>> I ran across an old design for an optical lever amplifier that used
>>> OC71 transistors. Had the misfortune to come into about 1,000 of those
>>> things as a wee lad. They almost put me off semiconductors.
>>>
>>> https://sites.google.com/site/transistorhistory/Home/european-semiconductor-manufacturers/philips
>>>
>>> 25mW maximum Pd (confused me when I ran into some hydrogen thyratons
>>> that were 40MW)
>>>
>>> -5V maximum Vce (minus plate voltage, what insanity is that?
>>>
>>> Beta of 50, not great, but not terrible.
>>>
>>> IIRC, leakage was horrible, uA at room temperature, and rapidly
>>> increasing if you approached that 25mW maximum Pd.
>>>
>>
>> When Keithley started using FETs instead of tubes in their
>> electrometers, their most sensitive range went from 100 fA FS to 10 pA
>> FS, and stayed there for years and years. Of course my 405 needs a
>> couple of hours' warm-up before that scale is usable.
>>
>> BTW there's a Megacycle Meter on eBay for $40 at the moment.
>> http://tinyurl.com/k2v2xlo
>>
>> Cheers
>>
>> Phil Hobbs
>
> http://www.convertunits.com/from/cycles+per+second/to/hertz
>
>
Wow, that'll come in handy. Thanks! ;)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
Reply by Joerg●October 22, 20132013-10-22
RobertMacy wrote:
> On Tue, 22 Oct 2013 09:45:15 -0700, Joerg <invalid@invalid.invalid> wrote:
>
>>> ...snip....
>> How horrific depends on the time it takes to full open. Burning off 335W
>> for a few microseconds isn't such a big deal.
>>
>
> but when left OPEN there are components that still get huge amounts of
> wattage AND high voltage! So, getting to OPEN fast just means the full
> brunt is applied sooner not that you pass through a 'danger' zone and
> then you are ok as it goes totally open. OPEN is the ABSOLUTELY worst
> case condition for all those parts.
>
> The lowest losses and lowest voltages on the components occur when
> trying to drive a dead short. mV and mW
Yeah, if it still wants to dump current at 1kV "open" isn't going to
work. I thought the thing was allowed to turn off in that case.
Without knowing what exactly you are doing all we can do it take
potshots at the problem.
--
Regards, Joerg
http://www.analogconsultants.com/
Reply by ●October 22, 20132013-10-22
On Tue, 22 Oct 2013 11:23:23 -0700, John Larkin
<jlarkin@highlandtechnology.com> wrote:
>On Tue, 22 Oct 2013 12:49:46 -0400, krw@attt.bizz wrote:
>
>>On Tue, 22 Oct 2013 08:21:57 -0700, John Larkin
>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
>>
>>>On Mon, 21 Oct 2013 19:59:06 -0400, krw@attt.bizz wrote:
>>>
>>>>On Mon, 21 Oct 2013 16:24:43 -0700, Joerg <invalid@invalid.invalid>
>>>>wrote:
>>>>
>>>>>krw@attt.bizz wrote:
>>>>>> On Mon, 21 Oct 2013 10:39:20 -0700, Joerg <invalid@invalid.invalid>
>>>>>> wrote:
>>>>>>
>>>>>>> krw@attt.bizz wrote:
>>>>>>>> On Mon, 21 Oct 2013 06:52:46 -0700, Joerg <invalid@invalid.invalid>
>>>>>>>> wrote:
>>>>>>>>
>>>>>
>>>>>[...]
>>>>>
>>>>>>>>> There are automotive electronics that work quite well, mostly in
>>>>>>>>> Japanese cars. In the end it boils down to the reliability ratings of
>>>>>>>>> the various entities in the know.
>>>>>>>> Things change. A lot!
>>>>>>>>
>>>>>>> That's what Maxim kept telling people :-)
>>>>>>
>>>>>> Touch�. The difference is Maxim keeps proving that while things
>>>>>> change, management doesn't.
>>>>>>
>>>>>
>>>>>There was another guy who promised change. Actually hope and change. I
>>>>>never saw the hope part and he made a royal mess.
>>>>
>>>>Sign up for Obamacare yet? ;-)
>>>>
>>>>>>>>>>>> However, I've been involved in many different markets at many
>>>>>>>>>>>> different levels, over the years. It's a *big* field. There is no
>>>>>>>>>>>> reason to do the same thing for forty years. Impossible, actually.
>>>>>>>>>>>>
>>>>>>>>>>> Not impossible. I met people who worked in one particular field such as
>>>>>>>>>>> engine control units for over 30 years. I'd have a hard time doing that,
>>>>>>>>>>> after being a consultant for this long.
>>>>>>>>>> ECUs have changed more than a little in 30 years. They will change
>>>>>>>>>> drastically, again, over the next ten. ...
>>>>>>>>> Sure, incremental change. Same in medical ultrasound which is my home
>>>>>>>>> turf. But ... after we built a flagship product in the late 80's and the
>>>>>>>>> satellite R&D location was closed afterwards I wasn't too unhappy that I
>>>>>>>>> could jump into consulting for the first time, and do something else.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> ... Hell, you'd have a hard time
>>>>>>>>>> showing up for work with your pants on, after being a consultant that
>>>>>>>>>> long. ;-)
>>>>>>>>> As a consultant I get to wear shorts all summer long. When a web
>>>>>>>>> conference with bigshots is coming up I have a "dress shirt on duty"
>>>>>>>>> hanging in the lab closet :-)
>>>>>>>> In my last job I was the only one who wore long pants from April to
>>>>>>>> October. Everyone else in Engineering wore T-shirts year 'round. I
>>>>>>>> can't do that. I wear long-sleeved shirts (Oxfords, preferred) even
>>>>>>>> for mowing the lawn.
>>>>>>>
>>>>>>> I am just the opposite. I wear shorts and T-shirts as long as I can.
>>>>>>> Only in really cold weather it's lumberjack shirts and jeans. For a
>>>>>>> winter coat or jacket it almost would have to drop to below 0F.
>>>>>>
>>>>>> Sure, I wear shorts[*] around the house, with Oxfords. I just can't
>>>>>> stand wearing T-shirts or even short-sleeved shirts. Spent a week at
>>>>>> the beach in September in swim trunks and oxford shirt. ;-)
>>>>>>
>>>>>
>>>>>Yikes. That is something I find odd. However, in places like Singapore
>>>>>people even wear shorts with dress shirts and ties. But short sleeves.
>>>>
>>>>I didn't get burned. ;-)
>>>>
>>>>Haven't owned a short-sleeved shirt in at least 45 years (maybe in
>>>>high school - before I bought my own clothes).
>>>
>>>I rarely deal with either buttons or shoe laces. Both are archaic wastes of
>>>time.
>>
>>Don't like pull over clothes of any kind. I have a few pullover
>>sweaters and sweatshirts but I rarely wear them. I really only need
>>something covering my shoulders and arms. Cardigans work, but aren't
>>currently in style so they're impossible to find.
>
>Me opposite. T-shirts and sweat shirts.
>
>>
>>Without laces, my shoes would fall off. Shoes without laces wouldn't
>>go on.
>
>People like Adidas used to make good velcro shoes, but they don't any
>more. So I buy running shoes and replace the laces with Yankz elastic
>laces, to convert them to slip-ons. Added advantage is that they don't
>come untied.