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Re: Tutorial version of Joule-Thief
John Woodgate
In message <kkbun5+ctqn@...>, dated Sat, 13 Apr 2013, Tim <thutches@...> writes:
I just uploaded a another copy of the JT, because I wnat to use it as a techng aid to introduce a family member to some EE concepts and LTspice. He just graduated high school and has no exposure but a lot of interest in electronics.Too late! You need to start at Grade 2 or earlier. (;-) It may be me, but I don't find non-linear oscillators at all simple. I favour sine-waves and audio frequencies, but we are all different. -- OOO - Own Opinions Only. See www.jmwa.demon.co.uk They took me to a specialist burns unit - and made me learn 'To a haggis'. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK |
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Tutorial version of Joule-Thief
All,
I just uploaded a another copy of the JT, because I wnat to use it as a techng aid to introduce a family member to some EE concepts and LTspice. He just graduated high school and has no exposure but a lot of interest in electronics. So having read the recent thread on the JT, I though it might be an excellent resource for him as it exposes transistor and switching theory and a lot of concepts in an easy to understand project that he can build and use my lab tools to verify the expected behavior. In my posted version, derived from , I tried to added a second circuit to compare the effects of using a different transistor than the B549 in the reference article and I attempted to estimate the Joules being consumed (atfter all it is a Joule Thief. If anyone cares to comment on how I might do this better (for the intended purpose), please do so. Thanks, Tim |
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Re: inverting opamp simulation: rapid component variation
--- In LTspice@..., "MOHAMMAD A MAKTOOMI" <amaktoomamu@...> wrote:
Hello, I have uploaded an example with a time-variable resistance. R=1k+5k*(V(ctrl)+1) Files > Temp > ni-opamp_.asc Best regards, Helmut |
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inverting opamp simulation: rapid component variation
Hi,
In an inverting amplifier(Uploaded File: ), suppose R2 fluctuates very rapidly (say at 10KHz or even higher, may be due to some environmental condition). How do I simulate this behavior, given input is some fixed dc voltage and opamp is 741 type (I have not attached any specific opamp model so far, use what you have). I am basically interested in perhaps frequency response- I want to see how output varies if rate of variation of R2 keeps increasing. |
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Re: How to find the max or min of a .measure command results?
--- In LTspice@..., "thomas.lafay" <thomas.lafay@...> wrote:
Hello Tom, You could plot the results from .MEASURE View -> SPICE -> Error log Right-mouse-click -> Plot Stepped data You could also copy the results(numbers) from the Error Log file to any math- or spreadsheet program to analyze the data. Best regards, Helmut |
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Re: Germanium transistor
--- In LTspice@..., ¨¢???????? ?????????¡Á <BordodunovAlex@...> wrote:
I don't see either of these in the standard library. I placed a pnp in a new schematic then right-click Pick New Transistor. I just did a sync release too. Decades ago 2N2955 was a silicon part (complementary to 2N3055). Jim |
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Re: Amplifier Design
How to use .param and .tran simulation in LtSpice?This is a homework assignment, right? Let me ask you this: Did you go to college to learn how to do those things yourself, so that you can become a good engineer, or are you looking for free handouts so you never need to do the work yourself? If the latter, you should be shamed into failing the assignment. Show us what YOU have done so far on this problem. You should have figured out most of it already. This is a forum where people help others who first make an attempt to do their work but run into something that doesn't work right. It is not where answers to homework assignments are handed out to losers who cannot be bothered to try. Are you one of those? One of the first pieces of advice I give many people about using LTspice, is to use it like they would if they had real parts on the bench. Let's say someone handed you some NMOS transistors and you had access to power supplies and DVMs and oscilloscopes. What would you do with them to characterize the transistors? Start by making LTspice do the same things. Andy |
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Re: Bridge current sensor INA193 or AD8210 available?
SPICE models for INA193 and AD8210 are available in the web site of TI
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and Analog Device respectively. Regards. Varoli Il 12/04/2013 9.04, mario.haselsteiner ha scritto:
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Prof. Vincenzo Varoli Politecnico di Milano Dip. Energia Via G. Ponzio 34/3 I20133 Milano Italia Tel. 0223996393 FAX 0223996309 |
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Amplifier Design
coolstar_aayush
How to use .param and .tran simulation in LtSpice?
Please show its use in this question- Use SPICE to plot the output characteristic for NMOS transistors with different Length's (constant W/L). For each curve, use the waveform viewer to plot the small-signal output resistance, r0, hence verify the theoretical dependence of trans-conductance on Length that you have studied in class. Use minimum feature size of 0.18μm. |
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Re: USE OF PWL FILE IN I SOURCE
What Andy said. What editor you use to generate PWL files with is the whole ball of wax, beyond just the more obvious PWL entry errors. Even the manner/format of the saved file, aside from the editor output, can mess things up. These sorts of gotcha;s have been around since the advent of personal computers.
________________________________ From: Andy <Andrew.Ingraham@...> To: LTspice@... Sent: Thursday, April 11, 2013 9:11 PM Subject: Re: [LTspice] USE OF PWL FILE IN I SOURCE ? I am trying to use a PWL file in a current (I) source however an error popsWe can't read your mind so we can't fix the problem if you don't show us the data that causes the problem. But speaking generically ... PWL data must have an even number of values. The error message implies you have an odd number. But I assume you knew that already. Look carefully for an extra space, or some other character which might have caused a value to be split into two. If it is a very large file, does it have linefeeds? That's just another thought. [Non-text portions of this message have been removed] |
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Re: USE OF PWL FILE IN I SOURCE
I am trying to use a PWL file in a current (I) source however an error popsWe can't read your mind so we can't fix the problem if you don't show us the data that causes the problem. But speaking generically ... PWL data must have an even number of values. The error message implies you have an odd number. But I assume you knew that already. Look carefully for an extra space, or some other character which might have caused a value to be split into two. If it is a very large file, does it have linefeeds? That's just another thought. |
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Re: USE OF PWL FILE IN I SOURCE
Ray Merewether
it would help a lot if you uploaded your circuit to the website. Attachments do NOT work on yahoo.
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-----Original Message-----
From: LTspice@... [mailto:LTspice@...] On Behalf Of imtiazk Sent: Thursday, April 11, 2013 5:20 PM To: LTspice@... Subject: [LTspice] USE OF PWL FILE IN I SOURCE Dear All I am trying to use a PWL file in a current (I) source however an error pops up every time saying "Missing value for final PWL time in source I1". I've examined my data file many times and no value seems to be missing. Any help in explaining/resolving the error would be greatly appreciated. Regards ik ------------------------------------ Yahoo! Groups Links |
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USE OF PWL FILE IN I SOURCE
Dear All
I am trying to use a PWL file in a current (I) source however an error pops up every time saying "Missing value for final PWL time in source I1". I've examined my data file many times and no value seems to be missing. Any help in explaining/resolving the error would be greatly appreciated. Regards ik |
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Re: Sub Circuits
Mike Sykes
Thank you very much aurora_iii it's all clear to me now. Another input from a friend re. using the Hierarchy to create symbols and the realisation that one can open one's own directory in the component symbol window to enable one to place the sub circuit in usual manner solves the problem. The real question is WHY ISN'T THIS PROCEDURE WRITTEN DOWN IN THE HELP FILE ? I've wasted a week trying allsorts of combinations until you answered my query. Thank you again.
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Rgds Mike Sykes ----- Original Message -----
From: aurora_viii To: LTspice@... Sent: Wednesday, April 10, 2013 6:09 PM Subject: [LTspice] Re: Sub Circuits If it means make a subckt in a library file, this needs an ASCII text editor - I copy the net list text (menu: View > SPICE Netlist) Paste into text editor, at the top put '.subckt [name] [nodes]' [name] is name of your 'device', whatever; [nodes] is the node numbers or node labels of all the circuit's external connections. At the bottom change '.backanno / .end' to '.ends' It also needs models of any specific components (diodes, transistors etc.) as .model lines. Text file can then be saved as, .sub .txt .lib as you prefer. Next you need to create a symbol for it, using LTspice symbol editor. The numbering order of the symbol ports must be the same as in the subckt nodes list; '1' is first and '5' is last for .subckt name 1 2 3 4 5; or 'in+' is first and 'vout' is last for .subckt name in+ in- v+ v- vout If as I did you look at examples it clicks into place how it all works. HTH |
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Re: Solar cell in Lt spice
--- In LTspice@..., "heitham_hh" <krouz_83@...> wrote:
Hello, 1. You can check with the simulation that you hit the same numbers(current, voltage) in the operating point for maximum power as in the datasheet. 2. Verify the open voltage, short current and optimum power point with a measurement. Then adjust your model. Best regard, Helmut |
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Re: Solar cell in Lt spice
heitham_hh
--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
Hallo Helmut, what you mean with same measurement to do a better model? is it short circuit current and no-load voltage? or i need some other values? thank you |
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Re: Germanium transistor
aetuhf
Both file names still say PNP. Does someone know how to rename the AC127 file to NPN?
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--- In LTspice@..., "aurora_viii" <aurvii@...> wrote:
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Re: European components
Ops, that didn't turn out that crisp.It all depends on the font your email program uses. You probably drew it in ASCII for a fixed font. Schematic symbols in LTspice are easily modified. LTspice includes the symbol editor. Draw it the way you like it. Change the squiggly lines to a simple rectangle. Or find someone else's. Since potentiometers are not built-in to LTspice, people add their own, and I believe several such models have been made, so you can probably find someone else's that looks the way you want yours to look. According to this group's Table of Contents file: (files > Tables of Contents > all_files.htm) there is a collection of European symbols at Andy |
thutches
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