Would you like to be able to calculate multiple layers at a single time? Would you like to be able to change copper/dielectric/trace width and see how it affects the impedance? Wouldn't you like to be able to change all of these and see the overall thickness? This and many more calculators and utilities all in one program http://www.pcbdr.com/ Direct download/online use. (Try it out online. It's free) http://home.hiwaay.net/~robdne/files/Beta%20ResourceV4.xls Chris Robertson Author "PCB Designer's Reference" [log in to unmask] http://www.amazon.com/exec/obidos/tg/detail/-/0130674818/qid=1050066233/sr=1-2/ref=sr_1_2/102-6322169-5005731?v=glance&s=books http://search.barnesandnoble.com/booksearch/isbnInquiry.asp?userid=31IA2SZUEK&isbn=0130674818&itm=4 http://www.booksamillion.com/ncom/books?id=2500661345456&pid=0130674818 ----- Original Message ----- From: Ray Dwyer To: [log in to unmask] Sent: Thursday, September 11, 2003 7:45 AM Subject: [DC] Greetings Ya'll I recived a number of request for info about the impedance calucator. So here is my attempt to give honor to where honor is due. The contribution by UltraCAD Inc. has been note worthy. They have a number of items worth reading. The umr.edu has an on-line calulator the work really well also. http://www.emclab.umr.edu/pcbtlc/ http://www.ultracad.com/ Remember 9/11, Ray Dwyer 972-371-4046 Maxim 4401 Beltwood Parkway Dallas, Tx. 75244 --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------