Gaetan, I made an inquiry to one of our design engineers regarding pcb traces as coils. Here is his response. "If you know the cross sectional area and length of the winding you can calculate the resistance. Ohms = rho x length/ Area where rho is the resistivity of the etch material. For copper rho = 1.72e-8 ohm x meters." Hope this helps. Phil Nutting -----Original Message----- From: Phil Nutting Sent: Thursday, December 13, 2001 12:43 PM To: Stephen Quigley Subject: pcb coils -----Original Message----- From: Gaetan Fournier [mailto:[log in to unmask]] Sent: Thursday, December 13, 2001 12:27 PM To: [log in to unmask] Subject: [TN] Trace resistance Does anybody knows a good link or freeware for DC resistive calculation in function with the thickness, width and length of a PCB track. I already know about "trace with calculator" http://www.aracnet.com/cgi-usr/gpatrick/trace.pl but this is not exactly what I'm looking for, current and temperature rises aren't the issues for my application. It's more a question of DC equivalent resistive for a coil made with a long PCB trace. Thanks GF ------------------------------------------------------------------------ --------- Technet 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 Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ------------------------------------------------------------------------ --------- --------------------------------------------------------------------------------- Technet 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 Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------