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Re: Bottom posting.
I didn't know Helmut was Italian! Thanks.
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--- In LTspice@..., John Fields <jbfields3@...> wrote:
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Re: Strange impedance curve
Ok, that was a good thing to learn...
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Thanks everyone! /Johan --- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
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Re: What changes would make LTspice better? - an improved diode type filter
--- In LTspice@..., "Suusi M-B" <smalcolmbrown@...> wrote:
Now that I have well over 100 different diode types in Ltspice I think that something that I would find useful would be a selector box for diode type "All, Germanium, Silicon, ZENER, SCHOTTKY, VARACTOR, LED" above the select window. LTspice is not intended as a parametric search for all possible diodes. You setup your schematic, choose the approriate parts and put them into LTspice. LTspice is only for simulating an existent schematic. BTW: when you open "pick new diode" click on e.g. "type" in the header. The colum will be sortet alphabetically: first all germanium, following LED, then ... up to type Zener .. :-) hws |
Re: spice problem :-(
--- In LTspice@..., John M Woodgate <jmw@...> wrote:
Thanx John, I will spend the rest of this day with searching the lib .lib ararchnid.mod. I think the best is to search in www3. best regards ... |
Re: spice problem :-(
--- In LTspice@..., "Tony Casey" <tony@...> wrote:
Yes, GaN FETs are perhaps godd for that. I've thought about that. They are good, if they have a large input resistance and low input capacity. I will check that. best regards ... |
Re: Implementing BSS138 spice model
--- In LTspice@..., "Tony Casey" <tony@...> wrote:
Hi Tony, Thank you for your fine and quick answer. I don't have any further questions, I think I understand :-). Regards Carsten |
Re: spice problem :-(
John M Woodgate
In message <j57d86+fkkg@...>, Charly Engineering <charly020664@...> writes
my LTspice-version has problems with that circuit :-)You need to .lib arachnid.mod, which you can download from the Web. -- This is my travelling signature, adding no superfluous mass. John M Woodgate |
Re: spice problem :-(
Tony Casey
--- In LTspice@..., "Charly Engineering" <charly020664@...> wrote:
Hello Leo, To my mind the ideal device for your circuit is the old VMP4 - a first generation VMOSFET from Siliconix from about 25years ago. These devices had a remarkable combination of properties, but I believe they also had spectacularly low manufacturing yield due to the V groove. Otherwise, their descendants might still be with us. Does anyone have more info on this? You might investigate whether GaN FETs would do the job for you. Check out: .. for example. Regards, Tony |
Re: Strange impedance curve
gasoltroll wrote:
A collegue suggested that I put the parasitics of the kapacitor in discreteWhat that probably did was move the series inductance so it is no longer in parallel with the (unspecified but non-zero by default) parallel capacitance, Cpar. Andy |
Re: Strange impedance curve
Helmut wrote:
Equivalent parallel capacitance(Cpar): 0pInteresting. This is one of those cases where the default value is not zero, but the Help doesn't tell you this. Judging by the Help, I would have thought that the default would be zero. Someone needs to make the Help more helpful! Andy |
Re: model, subckt tube EC81 = 6R4
--- In LTspice@..., "boid_twitty" <legg@...> wrote:
... I've never seen that, he must have had the idea for the radiator in the second of my birth or he had no wood for his fireplace at home .... best regards Leo... |
Re: model, subckt tube EC81 = 6R4
Tube life is related more to the temperature of their envelope, if the heater is reliably constructed.
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I'm not sure that you can assume a more reliable tube technology, post 1960. A fifty year old piece of equipment has not demonstrated a 50 year component life....... RL --- In LTspice@..., John Woodgate <jmw@...> wrote:
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Re: Implementing BSS138 spice model
Tony Casey
<snip>
Hi Tony and others,</snip> Hello Carsten, 1. The MN prefix tells SPICE that the device is an N-channel MOSFET. 2. An intrinsic device is a fancy name for a circuit element that is built in to the SPICE code. Please read the LTspice>Circuit Elements section of the Help for a complete list. 3. It is frequently recommended to avoid placing any user files in any part of installation tree, particularly if you expect to have to share simulation files with co-workers etc (it may also be overwritten in an update if Mike introduces a file of the same name - unlikely, but possible). This is because you cannot everyone else will have the same files there; you should only assume they will have the installation defaults. The advice is therefore to place any user files (.models, subcircuits, .meas scripts) in the folder containing the top level schematic. LTspice will always find them there. In principle, you can place a model anywhere if you provide an absolute path to the file in the .inc statement, but it's asking for trouble. Nevertheless, people continue to ignore the advice. Regards, Tony |
Re: SPICE Error
Tony Casey
--- In LTspice@..., Tan Micheline Tambayong <micheline.tambayong@...> wrote:
Hello Micheline, Your circuit won't converge because of the ideal diode model. If you add Roff=10Meg to the model, it fixes the convergence issue. Regards, Tony |
Re: Implementing BSS138 spice model
--- In LTspice@..., "Tony Casey" <tony@...> wrote:
Hi Tony and others, Three more questions: 1) If prefix for an nmos.asy symbol is stated as MN, what does that mean? 2) Could you also try to explain what an intrinsic model is, I don't think I exactly understand that? 3) Is it possible to place a model elsewhere than under the \lib\sub folder or schematic folder besides from an website? Regards Carsten |
Re: What changes would make LTspice better? Pan in schematic
--- In LTspice@..., "Randoid" <randoid@...> wrote:
There is something I would like different, but have always been so grateful for LTspice that I didn't want to rock the boat; In the schematic editor, it is not possible to pan far (or sometimes at all) past the extent of the existing schematic. For example, imagine that I have the output of a circuit and want to add some load to it. Often I end up zooming right out so I can see to the right and then place a GND somewhere over there so I can zoom in again and place my new bits. If you copy a block of circuit, it gets even worse as you try to pan past the existing circuit, and LTspice says "oh no you don't!" and bounces back. Sometimes I place a few GND points around and then have to move the entire schematic over a bit to make space on one side to extend it. I also like analoguespiceman's suggestion, and would like to have this feature added to a number of other applications that I use :) |
Re: Strange impedance curve
A collegue suggested that I put the parasitics of the kapacitor in discrete components in series, and that fixed the problem. Bug?
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/Johan --- In LTspice@..., Christian Thomas <ct.waveform@...> wrote:
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