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Ω vs R and μF vs uF [message #158026] Sun, 02 November 2014 10:40 Go to next message
messages@element14.co
Messages: 395
Registered: March 2013
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When designing board what is the recommendation for putting in the values for resistors and capacitors?Should I use the Greek letters or use the Latin equivalents.Does this make any difference when using "Design Link" ?Original article at http://www.element14.com/community/message/130102?tstart=0#130102.

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Re: Ω vs R and μF vs uF [message #158027 is a reply to message #158026] Sun, 02 November 2014 13:43 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
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When designing board you can use any letter as your wish,Design link doesn't bother what you have used in your board.Design link simply searches the typed part number in its search box. Original article at http://www.element14.com/community/message/130087?tstart=0#130087.

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Re: Ω vs R and μF vs uF [message #158029 is a reply to message #158026] Sun, 02 November 2014 14:24 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
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yes, but that does not work for resistors and capacitors as you don't specify the value in the part selection just the device size and type e.g. a 0402 SMD Resistor, the value is provided separately.Original article at http://www.element14.com/community/message/130106?tstart=0#130106.

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Re: Ω vs R and μF vs uF [message #158033 is a reply to message #158026] Sun, 02 November 2014 15:48 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
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Value works better than just name , I always use values to search not the package yeah sometimes i use both to make search more precise for example " 100nF 0402" or " 0.1uf 0402" this gives less than 50 search results which are easy to look at but while using " 0402 capacitor" gives a endless list of capacitors of all values.Original article at http://www.element14.com/community/message/130090?tstart=0#130090.

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Re: Ω vs R and μF vs uF [message #158034 is a reply to message #158026] Sun, 02 November 2014 16:43 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
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Hi Andy, Like many things today the rules are more flexible. From a purely scientific approach the Greek letters are more correct but the unavailablity of the Greek letters on many applications and computers make the more common replacements acceptable. I always use the uF when working on the computer and the Greek when hand writing. As long as you label for best communication and understanding you will probably not encounter any problems.JohnOriginal article at http://www.element14.com/community/message/130124?tstart=0#130124.

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Re: Ω vs R and μF vs uF [message #158036 is a reply to message #158026] Sun, 02 November 2014 21:37 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
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The convention I use (and have seen used a lot) is not to show any unit for resistors, since they are usually the most common part.  So "100" means a 100Ω resistor and "1K" means 1KΩ.  Everybody else gets a unit, like 0.1uF capacitor or 8mH inductor.  I always use "uF" for μF in schematics -- this has been a common substitute for decades (at least).  Relying on the Symbol font to be present can be risky -- I've seen data sheets that recommend 1KW resistors when they meant 1KΩ.Original article at http://www.element14.com/community/message/130135?tstart=0#130135.

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Re: Ω vs R and μF vs uF [message #158037 is a reply to message #158026] Mon, 03 November 2014 04:45 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
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I've tended to see R for the resistors this means you don't require the appropriate font.ie 100R for 100 ohms, 1k5 for 1500 Ohms or 1R5 for a 1.5 ohm This tends to work since the little tiny dot often disappears or is hard to read ...etc MarkOriginal article at http://www.element14.com/community/message/130143?tstart=0#130143.

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Re: Ω vs R and μF vs uF [message #158038 is a reply to message #158026] Mon, 03 November 2014 05:30 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
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What you describe is actually an international standard of the SI system. I wouldn't be so smart except that Shabaz gave me a link today to something else and they had a paragraph about the SI system. It makes really good sense and I will convert to it in my notation henceforth. Unfortunately we cling to our antiquated systems here in the US so it may be a while before our schools follow suit.JohnOriginal article at http://www.element14.com/community/message/130144?tstart=0#130144.

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Re: Ω vs R and μF vs uF [message #158039 is a reply to message #158026] Mon, 03 November 2014 05:42 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
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Unfortunately we cling to our antiquated systems here in the USYes I noticed except I do like cubic inches, and the more the faster it goes.....That may be why I've been seeing it more .... thanksMarkOriginal article at http://www.element14.com/community/message/130145?tstart=0#130145.

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Re: Ω vs R and μF vs uF [message #158040 is a reply to message #158026] Mon, 03 November 2014 06:13 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
Senior Member

Unfortunately we cling to our antiquated systems here in the US

In the UK we do tend to mix things here which I find very annoying, I'll stick with the SI units that makes the most sense. Cadsoft seems to have a strong German team so I should be good with that and my experiments are consistent with what others suggested in that the characters are mostly ignored.Original article at http://www.element14.com/community/message/130148?tstart=0#130148.

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Re: Ω vs R and μF vs uF [message #158042 is a reply to message #158026] Mon, 03 November 2014 09:03 Go to previous messageGo to next message
messages@element14.co
Messages: 395
Registered: March 2013
Senior Member
Greek Characters are correct.Roman characters "u", "R" are used because they are more simply found and better supported on modern computers with out support of extra fonts etc. It's unusual to see the Greek characters in diagrams these days because of this.Using hand drawn diagrams this didn't used to be the case.Original article at http://www.element14.com/community/message/130159?tstart=0#130159.

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Re: Ω vs R and μF vs uF [message #158043 is a reply to message #158026] Mon, 03 November 2014 09:04 Go to previous message
messages@element14.co
Messages: 395
Registered: March 2013
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I mix them and don't find a problem Original article at http://www.element14.com/community/message/130160?tstart=0#130160.

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