Re: Henry's current transformer problem
Borodoynov Thank you that looks like a good typical material to use. My understanding is then that given that I am operating at only 50Hz with just some high frequency transients, that any core losses
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hkafeman@...
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#90097
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Re: Henry's current transformer problem
Hello Henry Kafeman. See material N41 BS (25 ¡ãC)=490mT BS (100 ¡ãC)=390mT Hc (25 ¡ãC)=22A/m Hc (100 ¡ãC)=20A/m Br=0.1T Power Transformer (low loss) f<100 kHz N27 (?i = 2000 ) low cost, hi-power N41
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#90096
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Re: Henry's current transformer problem
analogspiceman and Andy Thank you for your replies. I appreciate that there are many different Ferrite materials. I do not know which specific material my CT is made of, so am looking to model a
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HKafeman <hkafeman@...>
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#90095
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Re: Need help to design a transimpedance amplifier
Thanks for your response Jerry Lee Marcel.. But...I could see this noise everywhere in the circuit.. I mean power supply as well...
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t.obulesu@...
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#90093
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Re: Need help to design a transimpedance amplifier
I design a lot of TIA type of amp. I don't know what kind of speed you are looking for. But your requirement is very easy, the lowest is 200nA. Any opamp with bias current of less than 10nA will work
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Alan Liu
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#90110
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Re: Need help to design a transimpedance amplifier
I tried to answer a couple of days ago, but it didn't come through, so I'll write it again: The noise you observe compes from the fact that you have these big 100k resistors in the non-inverting
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Jerry Lee Marcel
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#90090
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Re: "4 GROUP.zip" upload
I am sorry. .MODEL BS250P .... Bordodynov. 05.08.2016, 09:35, "§¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó BordodunovAlex@... [LTspice]" <ltspice@...>:
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§¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó
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#90089
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Re: "4 GROUP.zip" upload
Hi. .model BS170 VDMOS VTO=1.824 RG=270 RS=1.572 RD=1.436 RB=.768 KP=.1233 Cgdmax=20p Cgdmin=3p CGS=28p Cjo=35p Rds=1.2E8 IS=5p Bv=60 Ibv=10u Tt=161.6n .MODEL BS250 VDMOS pchan Rg=160 VTO=-3.193
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§¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó
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#90088
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Re: PWL TRIGGER syntax
TRIGGER V(n003)>1 Without knowing what you have, if you're using the "trigger" keyword with current sources, it doesn't work, only for voltage sources. Vlad ______________________
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Vlad
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#90087
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Re: BS250 & BS170 SIM
Jeff wrote: "they look like they should work, but the don't, how can I add them to my CMP folder, that is what is the correct model layout." I just noticed you sent this question two days ago. It
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Andy
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#90084
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Re: Sub circuit heat dissipation not showing
Brad wrote: "I hit SEND but it isn't here ?? I don't understand. Humm.." Yup. Yahoo was having major problems yesterday. Hopefully that is over. File uploads/downloads seemed to be unaffected, but
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Andy
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#90080
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Re: LTspice IV (NOT RESPONDING)
There is one thing I can do with LTspice on my home computer that causes Windows to think it is not responding. If I turn on Mark Data Points in the waveform display, and if the density of points is
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Andy
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#90117
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Re: PWL TRIGGER syntax
Hello, The 32 bit version of LTspiceXVII had a problem with PWL in early versions. Do you use the 32 bit version LTspiceXVII.exe(x86)? Please update LTspiceXVII to the latest version. Tools > Sync
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Helmut Sennewald
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#90079
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Re: "4 GROUP.zip" upload
Jeff asked: "Is there an easy or a standard way to make a model for these transistors that can be included in LIB/cmp/standard.mos?" For the BS250P and BS170 transistor models you used, no, there
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Andy
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#90086
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Re: high frequency MHz and GHz range BJTtransistor or Mosfet
The major problem with tuned RF design is you don't know where the optimize point is for minimum reflection and maximum power transfer. You have 3 variables, L, R and C and you have more than one
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Alan Liu
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#90076
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Re: high frequency MHz and GHz range BJTtransistor or Mosfet
LTspice is good up to frequencies where you need to use distributed elements, which I suppose is about 1 GHz. It's not intended to be an optimiser. Is there anything a Smith chart can do that LTspice
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John Woodgate <jmw1937@...>
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#90075
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Re: high frequency MHz and GHz range BJTtransistor or Mosfet
This is not exactly relate to the original question. My question is how useful is LTSpice for RF design? I was an RF engineer, we use Microwave Office and using Smith Chart for matching and gain. I
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Alan Liu
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#90074
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Re: high frequency MHz and GHz range BJTtransistor or Mosfet
....for those of you new to "BJT land", I found this little tidbit* on youtube: https://www.youtube.com/watch?v=V9xUQWo4vN0 https://www.youtube.com/watch?v=V9xUQWo4vN0 No Helmut they didn't have the
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William
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#90085
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Re: high frequency MHz and GHz range BJTtransistor or Mosfet
yes, but that¡¯s the can. The mmbt918 in sot23 is in stock @ 4?@3k. Much better deal than ?4. Sent: Wednesday, August 03, 2016 11:47 PM To: LTspice@... Subject: Re: [LTspice] high
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Ray Merewether
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#90072
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Re: Sub circuit heat dissipation not showing
Hello, I also miss two of my messages regarding AD830 from last night. They are still not there. It seems Yahoo had a problem last night. There was a new poll a few days ago. I have deleted this poll,
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Helmut Sennewald
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#90092
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