Hi Richard,

Actually, there might be a dirty way to do almost exactly what you want.


Brian's dirty way, I think this should work, haven't tried it yet.


Place library, or all components in a schematic & keep this schematic.

When you want to do a global search & replace, or change in your library, edit the 
schematic page's components fields.  Use the schematic's match by wild card & replace 
like you normally able to, or even use the export to spread sheet.

Now, when you are done, make a new library from project.  Voila, your new library will 
have all your changes as well as all the other unchanged parts on your schematic page.

_____________
Brian Guralnick


----- Original Message ----- 
From: "Jon Elson" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Wednesday, July 11, 2001 1:12 PM
Subject: Re: [PEDA] Off topic / Need formula to calculate F in Mhz > Wave length.


| 
| 
| Brian Guralnick wrote:
| 
| > Hi all,
| >
| >     Little off topic, I figured I might get a quick response here.  I need the 
|formula to determine the Wave Length in Meters with regard to a specified frequency 
|in MHz.
| 
| Is that the wave length in free space, or on a PC board?
| 
| In free space, it is L = C / F , where C is the speed of light, 299,792,458 M/S,
| F in Hz.  So, 1 MHz is 299.8 Meters.
| 
| For a PC board, you'd need to know the velocity of propagation, which can be
| computed if you know the characteristic impedance of the signal trace.
| 
| Jon
| 
| 


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