At 12:10 PM 11/21/02 +0000, you wrote: >However my application calls for measuring > 10 amps at 24v which would >require a >sense resistor of 5 mOhm. How on earth (apart from a pcb track which I don't >think >I will be able to measure or make) do I get 5 mOhm ? You could buy two 10m Ohm parts and put them in parallel. Digikey has them for (1W 0815 SMT parts from SSM) for about $2 each one-off; 1% tolerance. If it's a volume application, you can get hairpin type open wire parts for much, much less, but this could get you started. Obviously layout counts at these levels. Use Kelvin connections. If you insist on making home-made resistors, at least try to get ahold of Constantan or Manganin wire which doesn't suffer from the rather large (about +4000ppm/K) tempco of copper (and most other elemental metals). Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body