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Re: test circuit for TLV341 voltage reference need help
--- In LTspice@..., "Gandolf" <charlesknouse27@...> wrote:
Marturin, Now that you know how to model a diode, just plug in the behavior you want in the modeling program. It might give reasonable results. Rick |
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Re: test circuit for TLV341 voltage reference need help
Gandolf
Ah, phooey, I've gotten it all mixed up. Nope, it's not the TL341 OR the TLV431...what I am really trying to find is a model for the LM4041 or ANY shunt 1.225 volt reference (not adjustable, although at this point I'd take anything).
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Is there a diode model I can just set the forward voltage to 1.225 and be done with it? That's all I really need. VB, Maturin --- In LTspice@..., "Gandolf" <charlesknouse27@...> wrote:
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Re: test circuit for TLV341 voltage reference need help
Gandolf
Thanks again, Tony.
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I looked! I swear on my mother's grave!! However, in this case I must have gotten dyslexic: I appear to have searched for TLV341 instead of TLV431. However, I FIRST searched for the LM4041, and I swear to God there is no reference to the LM4041 anywhere in the LTspice/files table of contents. Then I went to the Pspice models for TI, and there was no model for it there, either. Arrrrg. Drat!! So I switched to the TLV431 as a substitute. My previous difficulty with finding LED models was due to not knowing to search under "diode" for an LED. Now, I DID know that an LED was a diode, LOL, but it didn't occur to me to search under "diode" as the master category. It's not for lack of searching...it's lack of knowing how to find what I'm looking for in some cases. Unfortunately for EE-quality members in this forum, LTspice enables rank amateurs like me to play with electronics LOL. Another big part of this: it's a lot easier to find something when you already know for sure it's there ;) In any case, please know I am very grateful indeed for the helpful pointers to the right places to look. I am constantly learning from this group. VB, Maturin --- In LTspice@..., "Tony Casey" <tony@...> wrote:
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Re: need help making Help for diode modeling program work
Gandolf
YAY! I got it to work!
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However, I have a leeeetle question: In the Help, it says that the 3rd forward characteristics box is for the difference between the first two measurements (I think...there's also something in there about difference between "ideal" and "measured")... ...but when I entered the differences in voltage and current between my first 2 measurements into the 3rd box, it simply errorred (microsoft doesn't think "errorred" is a word, but I disagree)... ...when I entered values into box 3 from much higher up on the Id vs Vf graph, it did not error. So, presumably, the 3rd box is for values much higher up on the graph. ??????? BTW, I tried values for the 3rd box that were higher, but only moderately higher than the "knee" value, and the program wouldn't accept them. It wasn't until I took values much higher up, well into the saturated portion of the graph, that the program accepted them. FINALLY, my simulation is now happy...thank God. And thank Hendrik Van Zwerver. VB, Maturin For anyone who might care (doubtful), here's what I ended up with for the Kingbright WP710A10SRC (660 nm 3 mm T1) LED: .model WP710A10SRC d( + IS=4.58E-13 N=2.973 RS=1.197388 + EG=1.43 XTI=3) --- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
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Re: need help making Help for diode modeling program work
WHERE IS THE MODELING FILE?
________________________________ From: Dave <dave.g4ugm@...> To: LTspice@... Sent: Saturday, September 1, 2012 3:09 AM Subject: RE: [LTspice] need help making Help for diode modeling program work ? Open the folder where you extracted the files too, right click on the "diodemodelingtool.chm" file and choose properties, click on the "unblock" button. Dave Wade G4UGM Illegitimi Non Carborundum -----Original Message-----%20Tools/Diode/ and downloaded the files. I have the program for modeling diodes installed, and have downloaded the Help file/program, but I can't get the Help to run. It gives the error message something to the effect that "access to the webpage has been canceled" Can anyone help me get this help to work? I didn't cancel anything that I know of, and I downloaded the Help again and tried to open it a second time, but not luck. I did my best to "fly blind" with the program, but it also gave me an error, saying one of my values was non-computable. Since I had done my best to take the values right from the datasheet graph, I need the Help to help me figure out how to make it work. VB, Maturin ------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed] |
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Re: electrical contact model with bounce
how about using a damped sinewave driving a voltage controlled switch?
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On 9/1/2012 10:36 AM, John Woodgate wrote:
In message <50420C87.705@...>, dated Sat, 1 Sep 2012, Jack Smith |
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Re: electrical contact model with bounce
John Woodgate
In message <50420C87.705@...>, dated Sat, 1 Sep 2012, Jack Smith <Jack.Smith@...> writes:
I believe mercury wetted reed relays show no bounce but it's been 40 years since I had one in my hands so I could well be remembering it incorrectly.True, but the use of mercury even in tiny amounts is, in many countries, severely restricted. I think the 'non-bouncing' reeds that I remembered have to be switched with a relatively slowly increasing current, not a pulse. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Instead of saying that the government is doing too little, too late or too much, too early, say they've got is exactly right, thus throwing them into total confusion. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK |
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Re: Arbitrary WaveForm Generator
A voltage (or current) source with the PWL (Piece-Wise Linear) option
is the way to generate arbitrary waveforms in the time domain. A PWL source can load a separate file that has the PWL data. The format is (time, voltage) or (time, current), the reverse of what you listed. Use decimal, not binary data. If you need to stimulate three sources simultaneously, I think you need to have three PWL files, one for each. Andy |
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Re: I can not access the File of LTspice.
--- In LTspice@..., Andy <Andrew.Ingraham@...> wrote:
Hello Andy, I sent him a notice about my action to both emails and got a "not deliverable" to the other email-address. I had chosen to make a "master reset", because this thread has become an endless discussion about nothing. Maybe the language barrier was too high. Best regards, Helmut |
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Re: I can not access the File of LTspice.
Helmut wrote:
I have now deleted two the two members below from the group.... mr.shigematsu@...That was the one Shiggy has been using for his email to/from the group. So unless you CC'd Shiggy directly, he might not know that you sent him that message. By the way, I think he had been a member of the group since 2011, so I don't know what went wrong since then. Andy |
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Re: electrical contact model with bounce
I recently looked at a Form A (SPST) Meder SIL05-1A reed relay, normally
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open configuration. It has unmistakable contact bounce on make, and the data sheet spec for make time says "includes bounce." I can send scope images of the bounce to anyone in doubt. I believe mercury wetted reed relays show no bounce but it's been 40 years since I had one in my hands so I could well be remembering it incorrectly. Jack On 9/1/2012 8:33 AM, John Woodgate wrote:
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Re: electrical contact model with bounce
John Woodgate
In message <k1sjjo+p504@...>, dated Sat, 1 Sep 2012, John <unobtainium.geo@...> writes:
I cannot find a model for electrical contacts that simulates bounce. I do not need a full relay simulation with coils and such. I only want to model the electrical contacts of a reed relay with bounce.Old joke: Do reed switches bounce? No, if you drop one, it smashes. I thought the point of reed switches is that they don't have contact bounce; the magnetic field sticks the contacts together. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Instead of saying that the government is doing too little, too late or too much, too early, say they've got is exactly right, thus throwing them into total confusion. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK |
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Re: electrical contact model with bounce
Tony Casey
--- In LTspice@..., "John" <unobtainium.geo@...> wrote:
Hello John, Not sure where you looked or how hard, but googling "spice contact bounce" led immediately to: Perhaps that will inspire you. Regards, Tony |
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OT: Yahoo Problems Re: List Addresses Hacked
** BEWARE **
This may be old news, but got an e-mail just now purporting to come from Yahoo, to update member information, going to the link, first thing you are asked to do is enter member name / yahoo e-mail & password. It doesn't come from Yahoo it's a completely different web site, (only need to see what this is in browser's web address line, but don't post the form!) I.e. it's a phishing scam Just click Yahoo 'spam' button to dump the e-mail and notify Yahoo. HTH |
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Re: I can not access the File of LTspice.
Hello Shiggy San,
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I have now deleted two the two members below from the group. I hope this solves your problem. mr.shigematsu@... mr1.shigematsu@... Please make a new membership for the LTspice group. You can make it even with the same name and email address. Best regards, Helmut --- In LTspice@..., ?????¡§?? <mr.shigematsu@...> wrote:
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Re: Arbitrary WaveForm Generator
Tony Casey
--- In LTspice@..., "yhocom_7" <greg-brenda-nelson@...> wrote:
Hello GDN, You might want to check what the Helpfile says about PWL sources. Additionally, there is a raft of prior art in the files area of the group site: Regards, Tony |
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Re: test circuit for TLV341 voltage reference need help
Tony Casey
--- In LTspice@..., "Gandolf" <charlesknouse27@...> wrote:
Hello Maturin, I think you mean TLV431, not '341... You forgot to upload the Vref symbol. I happened to have a symbol for a TL431 I prepared earlier. That did have a different netlist order, so I swapped it over. It didn't work. Your model shows evidence of having been messed about with, so I quickly gave up, given that there are several working models and test circuits in the files area: and Did you not look there first? Regards, Tony |
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Arbitrary WaveForm Generator
LTspice,
I need to create an arbitray waveform generator that will be used for simulation. I need to have the discrete steps that a D/A would present to my system. Is it possible to feed a text file(at a specific rate) to a simulation and turn on/off current sources. I need to have several text files(waveforms) to experiment with. I will "try" and create an example asc file and upload. I will call it AWG.asc Thanks, GDN ----------------------------------------------------------- Example ramp text file for 3 bit D/A. 000 t1 001 t2 010 t3 ... tn 111 tn+1 |
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