On Tue, 05 May 2015 03:36:33 -0700, RobertMacy <robert.a.macy@gmail.com> wrote:>> ...snip....ARRRGGGG!!!! I sent the WRONG file to any of you! should have been the TUTORIAL_Example01.zip Throw away the TUTORIAL_StepByStep.zip !!! I'll go back and do again! ...sigh Regards to all, Robert
TUTORIAL - Example 1, Using Femm to Calculate Component Values of Simple Microstrip to use in LTspice/PSpice
Started by ●May 5, 2015
Reply by ●May 5, 20152015-05-05
Reply by ●May 5, 20152015-05-05
On Tuesday, May 5, 2015 at 11:39:41 AM UTC-4, Robert Macy wrote:> On Tue, 05 May 2015 03:36:33 -0700, RobertMacy <robert.a.macy@gmail.com> > wrote: > > >> ...snip.... > > ARRRGGGG!!!! > > I sent the WRONG file to any of you! > > > should have been the > TUTORIAL_Example01.zip > > Throw away the TUTORIAL_StepByStep.zip !!! > > I'll go back and do again! > > ...sigh > > Regards to all, > RobertFortunately I took me a while, so hopefully this is the correct file. https://www.dropbox.com/s/vj497e699t5ny81/TUTORIAL_Example01.zip?dl=0 George H.
Reply by ●May 5, 20152015-05-05
On Tue, 05 May 2015 08:05:52 -0700, RobertMacy <robert.a.macy@gmail.com> wrote:>On Tue, 05 May 2015 05:17:57 -0700, Phil Hobbs <pcdhobbs@gmail.com> wrote: > >> How about putting it on Dropbox or someplace like that? >> >> ABSE would work for many of us as well. >> >> Cheers >> >> Phil Hobbs > >Does nobody read?! I constantly complain about the 'toxicity' of those >websites, Dropbox, etc. Dropbox and all those 'free' websites sell >something to somebody ...else, Their customers are NOT the users. Those >websites start 'poking' around inside our PC's, causing hangs, and worst >of all, total crashes that require Power OFF reboots! And the times I sit >and wait and wait and they didn't crash us, they didn't even give me >access to what somebody dropped there. So, NO I now NEVER you those 'free' >websites.I'm not aware of any problems with Dropbox, except that it seems to slow down my computers a bit, which is reasonable since it's doing a lot of file transfers and checks and stuff. I no longer need to carry memory sticks around, and have access to my stuff on my 4 working computers scattered around the state. I think their biz model is to give away a couple of gigabtyes of storage, get people hooked, and get a few percent of their users (like me) to pay for more. Dropbox is wonderful. The future is access to your stuff anywhere, anytime, on any device. The automation of our cabin in the mountains (remote cam and heating control) is also through shared files on Dropbox. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●May 5, 20152015-05-05
On 5/5/2015 11:05 AM, RobertMacy wrote:> On Tue, 05 May 2015 05:17:57 -0700, Phil Hobbs <pcdhobbs@gmail.com> wrote: > >> How about putting it on Dropbox or someplace like that? >> >> ABSE would work for many of us as well. >> >> Cheers >> >> Phil Hobbs > > Does nobody read?! I constantly complain about the 'toxicity' of those > websites, Dropbox, etc. Dropbox and all those 'free' websites sell > something to somebody ...else, Their customers are NOT the users. Those > websites start 'poking' around inside our PC's, causing hangs, and worst > of all, total crashes that require Power OFF reboots! And the times I > sit and wait and wait and they didn't crash us, they didn't even give me > access to what somebody dropped there. So, NO I now NEVER you those > 'free' websites. >Well, you don't have to install the software. ABSE, then. 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 ●May 5, 20152015-05-05
On a sunny day (Tue, 05 May 2015 08:05:52 -0700) it happened RobertMacy <robert.a.macy@gmail.com> wrote in <op.xx53721g2cx0wh@ajm>:>On Tue, 05 May 2015 05:17:57 -0700, Phil Hobbs <pcdhobbs@gmail.com> wrote: > >> How about putting it on Dropbox or someplace like that? >> >> ABSE would work for many of us as well. >> >> Cheers >> >> Phil Hobbs > >Does nobody read?! I constantly complain about the 'toxicity' of those >websites, Dropbox, etc. Dropbox and all those 'free' websites sell >something to somebody ...else, Their customers are NOT the users. Those >websites start 'poking' around inside our PC's, causing hangs, and worst >of all, total crashes that require Power OFF reboots! And the times I sit >and wait and wait and they didn't crash us, they didn't even give me >access to what somebody dropped there. So, NO I now NEVER you those 'free' >websites.Did you see a shrink for paranoia?
Reply by ●May 5, 20152015-05-05
On a sunny day (Tue, 05 May 2015 09:17:38 -0700) it happened John Larkin <jlarkin@highlandtechnology.com> wrote in <6oqhkateiv4tepob4p8ttpr7qj0b3evpck@4ax.com>:>The automation of our cabin in the mountains (remote cam and heating >control) is also through shared files on Dropbox.As I just demonstrated again, running your own server is no problem at all, so you do not need dropping boxes.
Reply by ●May 5, 20152015-05-05
On Tue, 05 May 2015 17:52:38 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:>On a sunny day (Tue, 05 May 2015 09:17:38 -0700) it happened John Larkin ><jlarkin@highlandtechnology.com> wrote in ><6oqhkateiv4tepob4p8ttpr7qj0b3evpck@4ax.com>: > >>The automation of our cabin in the mountains (remote cam and heating >>control) is also through shared files on Dropbox. > >As I just demonstrated again, running your own server is no problem at all, >so you do not need dropping boxes.Dropbox runs a nice server farm (Amazon's actually), all backed up and stuff. All my app has to do is write a file, and it's automagically replicated on all my PCs. One cool thing is that if Dropbox dropped off the face of the planet, all my files would still be there, on all my PCs. I work at work, at home, in the cabin, and sometimes on the road. I can do anything anywhere with minimal overhead. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●May 5, 20152015-05-05
On Wed, 06 May 2015 02:17:38 +1000, John Larkin <jlarkin@highlandtechnology.com> wrote:> On Tue, 05 May 2015 08:05:52 -0700, RobertMacy > <robert.a.macy@gmail.com> wrote: > >> On Tue, 05 May 2015 05:17:57 -0700, Phil Hobbs <pcdhobbs@gmail.com> >> wrote: >> >>> How about putting it on Dropbox or someplace like that? >>> >>> ABSE would work for many of us as well. >>> >>> Cheers >>> >>> Phil Hobbs >> >> Does nobody read?! I constantly complain about the 'toxicity' of those >> websites, Dropbox, etc. Dropbox and all those 'free' websites sell >> something to somebody ...else, Their customers are NOT the users. Those >> websites start 'poking' around inside our PC's, causing hangs, and worst >> of all, total crashes that require Power OFF reboots! And the times I >> sit >> and wait and wait and they didn't crash us, they didn't even give me >> access to what somebody dropped there. So, NO I now NEVER you those >> 'free' >> websites. > > I'm not aware of any problems with Dropbox, except that it seems to > slow down my computers a bit, which is reasonable since it's doing a > lot of file transfers and checks and stuff. I no longer need to carry > memory sticks around, and have access to my stuff on my 4 working > computers scattered around the state. I think their biz model is to > give away a couple of gigabtyes of storage, get people hooked, and get > a few percent of their users (like me) to pay for more. > > Dropbox is wonderful. The future is access to your stuff anywhere, > anytime, on any device.Yes, persistent Internet threats (black hat hackers)love dropbox. It puts a big security hole in your system.> > The automation of our cabin in the mountains (remote cam and heating > control) is also through shared files on Dropbox. >
Reply by ●May 5, 20152015-05-05
On Tue, 05 May 2015 03:36:33 -0700, RobertMacy <robert.a.macy@gmail.com> wrote:>I offer to share with you a TUTORIAL but don't know how to get it into >your hands. > >The TUTORIAL is about 15kB, zipped, and describes the step-by-step process >of using FREE femm 4.2 to analyze a simple PCB structure to calculate >values to then use in circuit simulation, LTspice/PSpice. The sequence can >be modified for use in analyzing really complex structures, structures >where there are NO formulas. [I know there are many formulas and online >calculators for 'normal' structures that can provide similar values, BUT >they deprive you of gaining any understanding.] > >The simple structure in this example is a 50 ohm microstrip implemented >using 1 oz copper on a four layer 1 inch wide 5 inch long FR4 PCB >operating at 10MHz. The trace is 16 mils wide, copper 1.4 mils thick, and >dielectric separations of 9 mils each with the overall PCB thickness >approx 32 mils. The stack up is: >Layer 1 Trace >Layer 2 GND >Layer 3 Vcc >Layer 4 Trace > >An exmaple, of gaining insight: > >If the microstrip uses only the top two layers, evrything is 'normal' and >as expected. Current flows into the SIGANL trace and is RETURNed through >the GND plane. Of course no one would do that, you would always keep the >next layer, Vcc, and use it as a pseudo-ground plane. > >BUT! Now something very interesting happens. The RETURN current splits >between GND plane and Vcc plane, where the current in GND plane is in the >correct direction, but slightly MORE than what you put intn SIGNAL! and >there is a slight bit of that 'extra' current flowing in the Vcc plane, >BUT IN THE SAME DIRECTION AS THE SIGNAL??!! > >No book formula I've ever found will show you this, so there is >'education' in getting down into details. > >As I said, this is a step-by-step tutorial, with descriptions, >explanations, and dedicated femm drawings for each step culminating in >LTspice schematics of the final model. Hopefully, educational/useful for >someone out there. > >Regards, >RobertNow posted on the Simulations Tools & Macros Page of my website. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Statistics means never having to say you are certain
Reply by ●May 5, 20152015-05-05
On Wed, 06 May 2015 07:40:38 +1000, "David Eather" <eather@tpg.com.au> wrote:>On Wed, 06 May 2015 02:17:38 +1000, John Larkin ><jlarkin@highlandtechnology.com> wrote: > >> On Tue, 05 May 2015 08:05:52 -0700, RobertMacy >> <robert.a.macy@gmail.com> wrote: >> >>> On Tue, 05 May 2015 05:17:57 -0700, Phil Hobbs <pcdhobbs@gmail.com> >>> wrote: >>> >>>> How about putting it on Dropbox or someplace like that? >>>> >>>> ABSE would work for many of us as well. >>>> >>>> Cheers >>>> >>>> Phil Hobbs >>> >>> Does nobody read?! I constantly complain about the 'toxicity' of those >>> websites, Dropbox, etc. Dropbox and all those 'free' websites sell >>> something to somebody ...else, Their customers are NOT the users. Those >>> websites start 'poking' around inside our PC's, causing hangs, and worst >>> of all, total crashes that require Power OFF reboots! And the times I >>> sit >>> and wait and wait and they didn't crash us, they didn't even give me >>> access to what somebody dropped there. So, NO I now NEVER you those >>> 'free' >>> websites. >> >> I'm not aware of any problems with Dropbox, except that it seems to >> slow down my computers a bit, which is reasonable since it's doing a >> lot of file transfers and checks and stuff. I no longer need to carry >> memory sticks around, and have access to my stuff on my 4 working >> computers scattered around the state. I think their biz model is to >> give away a couple of gigabtyes of storage, get people hooked, and get >> a few percent of their users (like me) to pay for more. >> >> Dropbox is wonderful. The future is access to your stuff anywhere, >> anytime, on any device. > >Yes, persistent Internet threats (black hat hackers)love dropbox. It puts >a big security hole in your system. >The worst they might do is read some files. A serious black hat isn't going to be interested in my schematics and manuals and Spice files and pictures of ski lifts. Dropbox doesn't seem to have had any security issues in the last couple of years. Windows has had, what, hundreds? -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
