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Re: A three Phase question please
Yes it is a FuG 200 Radar set. I like reverse engineering things to see how they work. I understand PPI its the other approaches that I find interesting. ?power devices and gave up. Merry Yule to all |
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Re: Sub ckt
Hello Jack, Copy the model file into the folder of your schematic. Here is an example: All Files > Lib > BFR93A http://groups.yahoo.com/neo/groups/LTspice/files/%20Lib/BFR93A/ Best regards, Helmut ---In LTspice@{{emailDomain}}, <zardos49@...> wrote: I need a simple 1 transistor circuit example with the transistor using a subckt and the attached file and location of file called out. I want to standardize my oth files to it. Please give example. Fwd to Zardos49@...
Sent from my BlackBerry? by Boost Mobile |
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Re: CIC unstable output
Andy According to this link:??it is possible to have up to 8 stages, though it's true I haven't made one myself. This is to be a CIC interpolator/decimator up to N=8, found in Files/Filter/Filter.* , for the sake of completeness. It works just fine except for those symptoms. Somehow I think it would be nice for LTspice to have a digital simulator, too, to be able to separate the elements' nodes or to have special interconnected symbols that allow for mixed-signal simulation, because a even a simple step signal through an A-device may result in a less-than-digital output (all in favor of transient response). Vlad PS: I hope I didn't let the impression I was waiting for you, only, to answer, as much as I appreciate your answers.?:-) |
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Re: A three Phase question please
¿ªÔÆÌåÓýHi SuusiOn 12/21/2013 04:05 AM,
smalcolmbrown@... wrote:
I I have thought about the use of a switched mode, mainly for valve amplifiers, but wonder about the extremes of generating 800V DC at high frequency. I have not seen high speed rectifiers with greater than a 100 V rating. I guess that they exist, but the price tag is prolly horrendous and or the supply limited to defence contractors only. Not too long ago, i played with switch mode HeNe laser power supplies. The voltages and currents there are similar. The rectifiers are stacks of low voltage fast recovery types. I remember that they werent expensive. (You could stack your own 4148s, theyre cheap.) This might help: The circuit I'm playing with, dates from WW2. It discharges 0.7 Joules in 2uS every 20mS (350Kw) into a 24:1 step up transformer¡ Yes 10kV pulses¡ Everything about this circuit is extreme. Sounds like an old radar? Fun! -- AC2CL I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything. - Nikola Tesla |
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Mitsubishi-Renesas M51978FP controller SPICE model
Hello, I am trying to find this Spice model or similar? to understand how a 220V SMPS I have works.
I want to modify it to source 12V 3A instead of 7-10 V 3A as for now. I have drawn the secondary side on ltspice but I cannot make it simulate it nor phisically work? correctly, it keeps going into limit mode. It uses 2 opamps lm358 and 2 comparators lm393 and a PC113 optoisolator feedback and the M51978FP. For the simulation part, since I haven't a Spice Model for the M51978FP, I tried to use a Voltage controlled switch tied to the opto and a Voltage source with a triangular wave but I cannot get the system to start. I tried to inject a Pulse Voltage on the control side to kick start but even then it does not allow the triangular wave to build up a voltage. If someone is interested to discuss this issue I can publish the circuit and info I got so far. Thanks I uploaded the data sheet on the temp directory. |
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Re: A three Phase question please
Thanks interesting Suusi M-B |
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Re: CIC unstable output
Vlad,
I was out of town for a couple of days, and have yet to catch up on all my emails.
But I was wondering, do we know that the system being simulated is stable? ?Can you, and have you, made a digital model of the CIC interpolator and does it behave properly? ?Are there ways to measure the stability, to tell that it is not on the edge of instability, for example?
Andy |
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Re: CIC unstable output
At least does anyone know why the samples lose their constant-time values? Because adding?(one or more)?S&H between stages makes the output correctly sampled but awfully wrong. Is it because of the large number of integrator stages? It doesn't happen that way if you change it into a CIC decimator (and there are really large values after the upsampler). Vlad |
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Re: Yahoo Search Broken?
monettsys
--- In LTspice@..., John Woodgate <jmw@...> wrote:
Yes. It used to go to neo depending on how I logged in. But now it doesn't matter - it always goes to no matter what I do. You are not shown as a member with that username yet.Maybe it took time to update the log. Anyway, Yahoo accepted the post under that username, but still went to the same page and search was still broken. I deleted the new membership to keep the logs in order. Now I have to figure out how to get a copy of the 72k posts so I can search offline. It shouldn't be too big. Yahoo has a 100MB limit. I could put it on my website and get it indexed by google so others with the same problem could do searches. How would I go about getting permission from the members to do that? Thanks, Mike |
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Re: Yahoo Search Broken?
On 20/12/2013 22:01, Peter Johansson wrote:
On Fri, Dec 20, 2013 at 3:46 AM, monettsys <405a82e5@...> wrote:No it works well for me. The box says "search conversations" and I put something in and hit enter and the results pop up. Occasionally it pops up with a group search but going back to the group home page seems to sort it out. Pressing enter rather than having a button to press is a bit un-intuitive. I checked in IE 10, Chrome and Firefox. I would expect older versions of IE to have problems but they will probably have issues with other sites as well...Is anyone else having problems searching the forum? Yahoo's forum search isn't the greatest even when it does work. |
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Re: Yahoo Search Broken?
Re install
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Sent from my BlackBerry? by Boost Mobile From: "monettsys" <405a82e5@...>
Sender: LTspice@...
Date: Fri, 20 Dec 2013 23:00:15 -0000 To: <LTspice@...> ReplyTo: LTspice@...
Subject: [LTspice] Re: Yahoo Search Broken? --- In LTspice@..., cbayona <CBayona@...> wrote:
> > I went back and the search option is gone, that is why I use a mail > client and keep the emails that are important, the web site is a disaster. I just tried to reply to your post, but Yahoo skipped the original quote text and just gave a blank screen. After clearing the Firefox cache and logging on several times, your original text suddenly appeared. Search is still broken. I also keep the good posts, but that only goes back a couple of years. Lost the rest in a disk crash. I have a much better backup system now. So how do we find information in posts that may go all the way back t the beginning? I think Helmut keeps a copy of everything. Maybe we could ask him to put a copy on DVD and mail it to us. A small sum to defray the cost and time would be appropriate. The other problem is the format. I believe something like this was done either in this forum or another one. But the program that downloaded the files from Youtube saved them in a funny format that required a special reader. So if you wanted to use grep or some other search program, you were SOL. Isure would be happy to move to some other method and dump Yahoo. It has been such a pain for many years. Most of the other methods can send copies to various mail archinve services. These are indexed by google so you can search using all the google search options. Much faster and easier than Yahoo ever was. Thanks for your info, Mike Thanks, Mike |
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Re: Yahoo Search Broken?
monettsys
--- In LTspice@..., cbayona <CBayona@...> wrote:
I just tried to reply to your post, but Yahoo skipped the original quote text and just gave a blank screen. After clearing the Firefox cache and logging on several times, your original text suddenly appeared. Search is still broken. I also keep the good posts, but that only goes back a couple of years. Lost the rest in a disk crash. I have a much better backup system now. So how do we find information in posts that may go all the way back t the beginning? I think Helmut keeps a copy of everything. Maybe we could ask him to put a copy on DVD and mail it to us. A small sum to defray the cost and time would be appropriate. The other problem is the format. I believe something like this was done either in this forum or another one. But the program that downloaded the files from Youtube saved them in a funny format that required a special reader. So if you wanted to use grep or some other search program, you were SOL. Isure would be happy to move to some other method and dump Yahoo. It has been such a pain for many years. Most of the other methods can send copies to various mail archinve services. These are indexed by google so you can search using all the google search options. Much faster and easier than Yahoo ever was. Thanks for your info, Mike Thanks, Mike |
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Re: Yahoo Search Broken?
On Fri, Dec 20, 2013 at 3:46 AM, monettsys <405a82e5@...> wrote:
Is anyone else having problems searching the forum?Yahoo's forum search isn't the greatest even when it does work. Archive all your list traffic in gmail and let google search it. Obviously this will not search any of the traffic before you subscribed, but the sooner you start doing this the sooner it will be useful. -p. |
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Re: Switch ... on - Switch... off
Enrico wrote: ? "I thank you Andy, but i've made a small circuit with one switch ON and another OFF and they work exactly the same, so i don't understand the difference." Both S1 and S2 switches are controlled from the same voltage, 'b'. ?So they must work exactly the same. I believe the optional "on" and "off" parameters, with the Switch device, are aides or hints to LTspice, about its initial conditions. ?Occasionally, SPICE has difficulty figuring out whether a device such as a diode or a transistor should initially be ON or OFF when it does the initial transient solution. ?Adding that parameter is used as an initial guess, to help LTspice decide whether the switch (or diode or transistor) should initially be ON. ?Other than making it easier to solve for the initial conditions, it does not affect the rest of the simulation. ?Ultimately (except for that initial guess), the state of the switch is determined only by its control voltage. Regards, Andy |
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Re: Spice model
partho.duet?wrote: ? "But I knew that in Ltspice models are .spi, .cir and .net formet. I have face problem that there dodes not create symbol automatically in .mod format."
The filename (filetype or extension) makes no difference.
What matters is what is inside the file.
For a transistor, the contents of the file should USUALLY begin with:
.MODEL .... Occasionally a transistor model may be more complicated and contain a .SUBCKT section.
So, open the file and examine its contents. Andy |
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Re: Yahoo Search Broken?
Many of YahooGroups' functions seem to work for most people but not for others. ?I read regularly about this happening. ?Problems come and go ... and come and go again and again. ?Yahoo hasn't yet learned the old saying, "if it ain't broke, don't fix it."
I think the situation is that the bugs are all over the place, and Yahoo's servers do not all behave the same on any given date. ?You may just need to wait it out until it works again for you.
Andy |
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