Early switcher with schematic

Started by bitrex in sci.electronics.design3 years ago 5 replies

I've been looking for an LTSpice model for a thyratron like the 2D21 for a while, anyone have one? probably not too difficult to DIY a...

I've been looking for an LTSpice model for a thyratron like the 2D21 for a while, anyone have one? probably not too difficult to DIY a behavioral model I guess...


LTSpice LED parameters

Started by John S in sci.electronics.design4 years ago 66 replies

Here is what I have: .model LXHL-BW02 D(Is=4.5e-20 Rs=.85 N=2.6 Cjo=1.18n Xti=200 Iave=400mA Vpk=5 mfg=Lumileds type=LED) How do I change...

Here is what I have: .model LXHL-BW02 D(Is=4.5e-20 Rs=.85 N=2.6 Cjo=1.18n Xti=200 Iave=400mA Vpk=5 mfg=Lumileds type=LED) How do I change the Vf at a specified current? I suspect that it is more involved than just changing Rs. Thanks, Guys.


What Is So Damn Hard About a potentiometer In LTSpice ?

Started by Anonymous in sci.electronics.design3 years ago 9 replies

I have been up and down the road on this. It seems alot of people want this and a few have done it. I would like to just download it and put the...

I have been up and down the road on this. It seems alot of people want this and a few have done it. I would like to just download it and put the stuff where it belongs and bah da bing. I am not a dumbass but I don't know alot about software. I want to show my tone control set, which uses a different topology than anyone is used to. I HAVE seen it but it is rare. A shitload of the links on...


Unconnected part LTSpice seems to need (weird ...)

Started by Joerg in sci.electronics.design10 years ago 81 replies

Folks, This is close to voodoo but repeatable. Unfortunately I can't disclose the schematic since it is for a client. Just wondering , anyone...

Folks, This is close to voodoo but repeatable. Unfortunately I can't disclose the schematic since it is for a client. Just wondering , anyone had this before? At the far end of a TX line I used to have a diode connected across because a previous version of a chip would have such a substrat path. Nice waveforms, fast sims. Everything as expected and peachy. Now the new iteration of the c...


LTSpice query

Started by Cursitor Doom in sci.electronics.design2 years ago 15 replies

Greetings, gentlemen, The image below is how I've been representing variable resistors in LTS for like ever. But this circuit fragment -...

Greetings, gentlemen, The image below is how I've been representing variable resistors in LTS for like ever. But this circuit fragment - because it contains a disproportionately large number of variable resistors compared to everything else- really forced me to face up to the issue that I'm doing something wrong here. There must surely be a more elegant way than making up v.res out of two ...


LED forward voltage drop with temperature

Started by John S in sci.electronics.design2 years ago 70 replies

LTSpice says that the forward voltage drop of LEDs have a positive coefficient. That is contrary to my thinking and to my measurements. Am I...

LTSpice says that the forward voltage drop of LEDs have a positive coefficient. That is contrary to my thinking and to my measurements. Am I doing something wrong?


Are TI Pspice models encripted?

Started by Anonymous in sci.electronics.design6 years ago 67 replies

I was going to try to load the TI TPS54335 spice model into LTspice but it looks encrypted. Is TI encrypting its spice models...

I was going to try to load the TI TPS54335 spice model into LTspice but it looks encrypted. Is TI encrypting its spice models now? http://www.ti.com/product/tps54335 Thanks


Spice modelling of back EMF

Started by Cursitor Doom in sci.electronics.design6 years ago 71 replies

Hi all, I've been unable to get sensible results from simulating the voltage spike inductors generate when their magnetic fields collapse....

Hi all, I've been unable to get sensible results from simulating the voltage spike inductors generate when their magnetic fields collapse. The only possibility I can think of for this failure is that the standard inductor models have insufficient parameters for this purpose and require an extended parameter set. Like many of y'all I use LTspice, btw. Any ideas?


ReRAM ??

Started by Jim Thompson in sci.electronics.design9 years ago 34 replies

An interesting question came up on the LTspice List this morning concerning Spice modeling a ReRAM, a resistive element something like a...

An interesting question came up on the LTspice List this morning concerning Spice modeling a ReRAM, a resistive element something like a Memristor, but "different" ;-) The OP seemed over his head and couldn't quite vocalize how the ReRAM device behaves. I tried surfing and ran into the hurdles that any real information is locked behind the IEEE fiasco. All other links seemed more like...


Surrendering to the 555 Timer Option

Started by Ricky C in sci.electronics.design2 years ago 34 replies

I've looked at a number of different oscillators and either I can't bend them to my will because they are not very good oscillators or they aren't...

I've looked at a number of different oscillators and either I can't bend them to my will because they are not very good oscillators or they aren't really amenable to simulation in LTspice. I need to turn on a sounder for 1 second out of 4. A low going pulse is good as I'm using a driver FET even if it's not needed just to maximize the voltage range. The circuit needs to be ena


isolated rectifier files

Started by bitrex in sci.electronics.design7 years ago

Here is a link to a folder containing the bridge rectifier model and subcircuit files along with the circuit .asc, so anyone interested can...

Here is a link to a folder containing the bridge rectifier model and subcircuit files along with the circuit .asc, so anyone interested can see how it operates in LTSpice. https://www.dropbox.com/sh/8vc8qpxo0oopq52/AAA77_yAscRJVeixKJKl34b Aa?dl=0 -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/


BD131 Spice Model Wanted

Started by Julian Barnes in sci.electronics.design6 years ago 15 replies

Hi all, It still amazes me after all the years LTspice has been around the standard parts library in it remains so tiny. I don't think this...

Hi all, It still amazes me after all the years LTspice has been around the standard parts library in it remains so tiny. I don't think this long- standing defect in otherwise very good program will ever be fixed. So like anyway, has anyone got a model for a BD131 NPN transistor they could post here? TIA folks. CD


LT spice, how to add model lib

Started by George Herold in sci.electronics.design3 years ago 3 replies

Hi all, simple question how do I add a library to ltspice. Lib from...

Hi all, simple question how do I add a library to ltspice. Lib from here. https://www.classe.cornell.edu/~ib38/teaching/p360/lectures/wk12/l35/11.1/74hc.lib I've watched a few videos, but not working so well. George H.


Handling HSpice Files

Started by Jim Thompson in sci.electronics.design7 years ago

HSpice2PSpiceNewEdit.pdf, on the Simulation Tools & Macros Page of my website, has been updated with some new library format...

HSpice2PSpiceNewEdit.pdf, on the Simulation Tools & Macros Page of my website, has been updated with some new library format information. While the title says PSpice, the techniques apply to all Berkeley Spice derivatives... including LTspice ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovati...


LT Spice problem

Started by krw...@att.bizzzzzzzzzzzz in sci.electronics.design10 years ago 26 replies

I'm trying to add the models of a couple of N-FETs I use to LTSpice. I'm getting a simulation-time error that I can't resolve. Any ideas? ...

I'm trying to add the models of a couple of N-FETs I use to LTSpice. I'm getting a simulation-time error that I can't resolve. Any ideas? Thanks. The error: |M1: Only a level 9 B3SOI can have 6 nodes It thinks I have six terminals on my transistor and only SOI models have that many? Looks like only three to me. The circuit: Version 4 SHEET 1 880 680 WIRE 144 -80 16 -80 ...


LTSpice

Started by Cursitor Doom in sci.electronics.design3 years ago 24 replies

When I last did a fresh install of LTS in July of 2009, the executable I downloaded from Linear weighed in at 8.8Mb. Earlier today I downloaded...

When I last did a fresh install of LTS in July of 2009, the executable I downloaded from Linear weighed in at 8.8Mb. Earlier today I downloaded the latest exe from what is now Analog.com (guess they took over Linear) and it's almost 42Mb. That's quite a tidy increase! Anyone know what reason(s) is/are behind this? -- This message may be freely reproduced without limit or charge on...


Any of you use Multisim?

Started by Jim Thompson in sci.electronics.design7 years ago 10 replies

Any of you use Multisim? Can Multisim handle PSpice/LTspice style behavioral expressions... GDC_I1 X2 VN VALUE...

Any of you use Multisim? Can Multisim handle PSpice/LTspice style behavioral expressions... GDC_I1 X2 VN VALUE {(1+TANH(2.2/0.1*(V(X2,VN)-0.5)))/2*45u} Or can it only handle B-sources? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | ...


op-amp circuit wont work

Started by panfilero in sci.electronics.design10 years ago 38 replies

can anyone tell what I did wrong here? my goal is to measure current using an opamp, I need to be able to measure positive and...

can anyone tell what I did wrong here? my goal is to measure current using an opamp, I need to be able to measure positive and negative current, and I have these LTC2053 OpAmps available, but I'm trying to simulate what I'm thinking about doing in LTspice and I can't get any output at all.... I need to be able to see from 50uA to .1mA, which is a pretty big range (and I need this in positive...


NE3509 SPICE model?

Started by Joerg in sci.electronics.design10 years ago 19 replies

Gents, Does anyone know where to find the SPICE model for the NE3509? Or at least one that's close enough for pulse stuff? CEL only has the...

Gents, Does anyone know where to find the SPICE model for the NE3509? Or at least one that's close enough for pulse stuff? CEL only has the usual microwave models but I want to use it as a fast low capacitance switch and simulate in LTSpice. -- Regards, Joerg http://www.analogconsultants.com/


AN: LTspice Model forAnalog Devices ADCMP551 PECL/LVPECL Comparator Posted

Started by Jim Thompson in sci.electronics.design6 years ago

See ADCMP551_4LT.zip on the Device Models & Subcircuits page of my website. Sort of a SWAG, TC's not modeled, but should be suitable for...

See ADCMP551_4LT.zip on the Device Models & Subcircuits page of my website. Sort of a SWAG, TC's not modeled, but should be suitable for system analysis. Please try it out and let me know if it works to your satisfaction. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations ...