Steve,

You can download a free copy of Polar's PCB Controlled Impedance Calculator from our website at http://www.cyprus.on.ca/download/download.html

Although it doesn't offer differential impedance calculations, it is very easy to use. I beleive they are writing a new version that will include differentials, but I'm not sure of a release date.

You may want to contact us, or Polar's US offices ([log in to unmask]) and get a free copy of their booklet "An Introduction to the Manufacture of Controlled Impedance PCBs."

If you have any questions, please feel free to contact me personally. I'd be happy to offer any assistance possible.

Regards,
Greg
---
CYPRUS PRODUCTS INC.
http://www.cyprus.on.ca
----------

----------
From: 	Steves
Sent: 	April 15, 1997 10:39 AM
To: 	INTERNET:[log in to unmask]
Subject: 	Impedance software
Importance: 	High

     Does anyone know where we can find a really good impedance 
calculator program that is very easy to use (practical).  Many of the 
ones I have seen require U.S. to metric conversions, and do not 
support calculation of differential impedances for fabrication.  Any 
help on this subject would be appreciated.


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