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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