On 7/14/05, Jinx <joecolquitt@clear.net.nz> wrote: > > > Is it as simple as it seems....4-20mA current loops....put across > > a precision resistor and then feed to the A/D ? Or better....buffered > > thru a unity gain amp...? > > I'm getting good results with an F88, a 4-20mA depth sensor > and this > > http://www.maxim-ic.com/appnotes.cfm/appnote_number/823 There is s implest way if you check for a chip containing a voltage reference and an operational amplifier. Maxim have a few like those. best regards, Vasile > > Basically doing what you said. No adjustment or fiddling necessary > to get 1mV / mm over 5m (apart from grounding pin 1 of the 472, > which isn't shown above) > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist