At 09:06 AM 1/22/2002 -0800, Brad Velander wrote: >Juha, >Have you >considered doing your resistance as a short section of PCB trace? For >example a 0.020" wide trace, 1 oz CU, of 0.161 inches in length will give >you a resistance of 0.00399 ohms according to some calculators. This length >would probably need to be tweaked according to you PCB specs and the >fabricators typical tolerances. A lot of current sense devices have >application notes which suggest using specific lengths of traces for your >sense circuit.
One might be able to design something trimmable if more accuracy than the +/- 20% or so that I'd expect from normal fab tolerances were necessary. I'd think of a series of vias that could be drilled out, or shorted together with soldered wire jumpers. Of course, there is also temperature coefficient to be considered.... [EMAIL PROTECTED] Abdulrahman Lomax Easthampton, Massachusetts USA * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
