Ω vs R and μF vs uF

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.

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.

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.

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.

John

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.

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

Mark

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.

John

Unfortunately we cling to our antiquated systems here in the US

Yes 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 .... thanks

Mark

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.

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.