On Mon, 11 May 2015 18:42:16 -0700, John Larkin <jlarkin@highlandtechnology.com> wrote:>On Mon, 11 May 2015 18:04:05 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: > >>On Mon, 11 May 2015 20:58:40 -0400, Phil Hobbs >><pcdhSpamMeSenseless@electrooptical.net> wrote: >> >>>On 5/11/2015 4:23 PM, Jim Thompson wrote: >>>> On Mon, 11 May 2015 10:34:26 -0700, John Larkin >>>> <jlarkin@highlandtechnology.com> wrote: >>>> >>>>> On Sun, 10 May 2015 08:46:07 -0700, Jim Thompson >>>>> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>>>> >>>>>> Varistor/MOV Spice Modeling has been updated. >>>>>> >>>>>> See VaristorMOV.zip on the Device Models & Subcircuits Page of >>>>>> my website. ...Jim Thompson >>>>> >>>>> Encrypted! >>>> >>>> To conceal my techniques. >>> >>>Seems pretty pointless at your age, Jim. Are you ever going to pass on >>>all those pearls of wisdom, or are you going to take them to the grave >>>like King Tut? >>> >>>Soon would be good, if you're ever going to. >>> >>>Cheers >>> >>>Phil Hobbs >> >>Right now I'm making money at it. Why should I give away the store? > >An MOV model is "the store"? That's sort of sad. > >>Does Larkin post a _complete_ schematic of his instruments and >>manufacturing techniques here? >> >> ...Jim Thompson > >Sometimes I post actual product schematics, usually sheets relevant to >the topic, and photos of real boxes and boards. Sometimes I post >(non-encrypted!) Spice files. Sometimes I post ideas and scribbles >that I just imagined. > >I don't post manufacturing techniques, because my production people do >that, and it's fairly standard stuff. I have posted a lot of >breadboarding techniques, stuff that I do myself. > >I don't post encrypted Spice circuits and then tell people that I'm >smart, just because I say so. > >I still don't know why your thing would be any better than a couple of >zeners and resistors, and you won't say why.GFYU ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Update: Varistor/MOV Spice Modeling
Started by ●May 10, 2015
Reply by ●May 12, 20152015-05-12
Reply by ●May 12, 20152015-05-12
On Mon, 11 May 2015 20:48:20 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:>On Mon, 11 May 2015 18:42:16 -0700, John Larkin ><jlarkin@highlandtechnology.com> wrote: > >>On Mon, 11 May 2015 18:04:05 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>>On Mon, 11 May 2015 20:58:40 -0400, Phil Hobbs >>><pcdhSpamMeSenseless@electrooptical.net> wrote: >>> >>>>On 5/11/2015 4:23 PM, Jim Thompson wrote: >>>>> On Mon, 11 May 2015 10:34:26 -0700, John Larkin >>>>> <jlarkin@highlandtechnology.com> wrote: >>>>> >>>>>> On Sun, 10 May 2015 08:46:07 -0700, Jim Thompson >>>>>> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>>>>> >>>>>>> Varistor/MOV Spice Modeling has been updated. >>>>>>> >>>>>>> See VaristorMOV.zip on the Device Models & Subcircuits Page of >>>>>>> my website. ...Jim Thompson >>>>>> >>>>>> Encrypted! >>>>> >>>>> To conceal my techniques. >>>> >>>>Seems pretty pointless at your age, Jim. Are you ever going to pass on >>>>all those pearls of wisdom, or are you going to take them to the grave >>>>like King Tut? >>>> >>>>Soon would be good, if you're ever going to. >>>> >>>>Cheers >>>> >>>>Phil Hobbs >>> >>>Right now I'm making money at it. Why should I give away the store? >> >>An MOV model is "the store"? That's sort of sad. >> >>>Does Larkin post a _complete_ schematic of his instruments and >>>manufacturing techniques here? >>> >>> ...Jim Thompson >> >>Sometimes I post actual product schematics, usually sheets relevant to >>the topic, and photos of real boxes and boards. Sometimes I post >>(non-encrypted!) Spice files. Sometimes I post ideas and scribbles >>that I just imagined. >> >>I don't post manufacturing techniques, because my production people do >>that, and it's fairly standard stuff. I have posted a lot of >>breadboarding techniques, stuff that I do myself. >> >>I don't post encrypted Spice circuits and then tell people that I'm >>smart, just because I say so. >> >>I still don't know why your thing would be any better than a couple of >>zeners and resistors, and you won't say why. > >GFYU > > ...Jim ThompsonAfter you get well, you're welcome to try. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●May 12, 20152015-05-12
"Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message news:55515040.8030806@electrooptical.net...> Seems pretty pointless at your age, Jim. Are you ever going to pass on > all those pearls of wisdom, or are you going to take them to the grave > like King Tut?On a related note then, if anyone has something they'd like to model, I could take a crack at it. I suspect Jim isn't doing anything I don't know, and if he sees some examples, maybe he'd even admit what it is, too ;-) Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com
Reply by ●May 12, 20152015-05-12
"Tim Williams" <tiwill@seventransistorlabs.com> wrote:> "Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message > news:55515040.8030806@electrooptical.net... >> Seems pretty pointless at your age, Jim. Are you ever going to pass on >> all those pearls of wisdom, or are you going to take them to the grave >> like King Tut? > > On a related note then, if anyone has something they'd like to model, I > could take a crack at it. > > I suspect Jim isn't doing anything I don't know, and if he sees some > examples, maybe he'd even admit what it is, too ;-) > > TimPerhaps not the right place in the thread to say this, but what problems would come up if you modelled a varistor as a behavioural current source with I = k* V^alpha in series with a bulk resistance? I've had pretty good luck with that model (just not in SPICE).
Reply by ●May 12, 20152015-05-12
On 2015-05-12, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:> On Mon, 11 May 2015 17:18:25 -0700 (PDT), Lasse Langwadt Christensen ><langwadt@fonz.dk> wrote: > > [snip] >> >>apart from LTspice's encryption algorithm, how is there going >>to be much technical discussing about a binary blob? >> >>-Lasse > > The OP request on the LTspice List was for a model that worked. The > OP was having convergence issues with the "official" Littelfuse model. > > So I posted a working model to the List and posted it here thinking > there might be an interest _in_the_model_.I'm seeing interst in the model, rather than in _using_ the model. -- umop apisdn
Reply by ●May 12, 20152015-05-12
On Tue, 12 May 2015 04:59:44 -0500, "Tim Williams" <tiwill@seventransistorlabs.com> wrote:>"Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message >news:55515040.8030806@electrooptical.net... >> Seems pretty pointless at your age, Jim. Are you ever going to pass on >> all those pearls of wisdom, or are you going to take them to the grave >> like King Tut? > >On a related note then, if anyone has something they'd like to model, I >could take a crack at it. > >I suspect Jim isn't doing anything I don't know,Bwahahahahahaha! I needed a laugh right now.>and if he sees some >examples, maybe he'd even admit what it is, too ;-) > >TimHow about an NCP1072? That was requested on the LTspice List >:-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●May 12, 20152015-05-12
On Tue, 12 May 2015 13:03:16 GMT, Ralph Barone <address_is@invalid.invalid> wrote:>"Tim Williams" <tiwill@seventransistorlabs.com> wrote: >> "Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message >> news:55515040.8030806@electrooptical.net... >>> Seems pretty pointless at your age, Jim. Are you ever going to pass on >>> all those pearls of wisdom, or are you going to take them to the grave >>> like King Tut? >> >> On a related note then, if anyone has something they'd like to model, I >> could take a crack at it. >> >> I suspect Jim isn't doing anything I don't know, and if he sees some >> examples, maybe he'd even admit what it is, too ;-) >> >> Tim > >Perhaps not the right place in the thread to say this, but what problems >would come up if you modelled a varistor as a behavioural current source >with I = k* V^alpha in series with a bulk resistance? I've had pretty good >luck with that model (just not in SPICE).How about a resistor, diode, voltage source? A couple in parallel if you want some curvature. Bridge rectifier if you need bipolar. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●May 12, 20152015-05-12
On 12 May 2015 13:04:39 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:>On 2015-05-12, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> On Mon, 11 May 2015 17:18:25 -0700 (PDT), Lasse Langwadt Christensen >><langwadt@fonz.dk> wrote: >> >> [snip] >>> >>>apart from LTspice's encryption algorithm, how is there going >>>to be much technical discussing about a binary blob? >>> >>>-Lasse >> >> The OP request on the LTspice List was for a model that worked. The >> OP was having convergence issues with the "official" Littelfuse model. >> >> So I posted a working model to the List and posted it here thinking >> there might be an interest _in_the_model_. > >I'm seeing interst in the model, rather than in _using_ the model.There's not a lot of demand for an accurate MOV model, especially an encrypted one. Someone with a "B" (Beckman? Bourns?) used to sell a "precision" MOV. Its i-v curve was a square or an exponential or something, and it could in theory be used to do analog computing, multipliers and such. Given that MOVs are not stable and have a lot of capacitance, it was a silly idea that soon disappeared. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●May 12, 20152015-05-12
On Tue, 12 May 2015 09:51:10 -0700, John Larkin <jlarkin@highlandtechnology.com> wrote: [snip]> >There's not a lot of demand for an accurate MOV model, especially an >encrypted one. >[snip] There was a request on the LTspice List and I provided a model. Why do you have heartburn over "encrypted"? The model is completely general. All the parameters (fill-in the blanks) are available straight off of most datasheets. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●May 12, 20152015-05-12
On Tue, 12 May 2015 09:59:26 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:>On Tue, 12 May 2015 09:51:10 -0700, John Larkin ><jlarkin@highlandtechnology.com> wrote: > >[snip] >> >>There's not a lot of demand for an accurate MOV model, especially an >>encrypted one. >> >[snip] > >There was a request on the LTspice List and I provided a model. > >Why do you have heartburn over "encrypted"? >You keep telling us how smart you are, and how dumb we are, and all we need to do is take your word for it. Why are you keeping it a secret? Paranoia or insecurity? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
