Reply by John Larkin October 24, 20132013-10-24
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
Reply by ehsjr October 23, 20132013-10-23
On 10/23/2013 10:34 AM, Phil Hobbs wrote:
> On 10/22/2013 02:19 PM, John Larkin wrote:
snip
>> >> http://www.convertunits.com/from/cycles+per+second/to/hertz >> >> > Wow, that'll come in handy. Thanks! ;) > > Cheers > > Phil Hobbs >
Ooh, the pain! :-) Ed
Reply by Phil Hobbs October 23, 20132013-10-23
On 10/23/2013 12:48 PM, Michael A. Terrell wrote:
> > 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&#2013265929;. 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.
Those are neat. I'll have to try a set or two.