On 6/9/05, Todd Bailey wrote: > Mike, > > The equation you suggested is absolutely right -- that's exactly the > function I want, although the circuit doesn't have to be single supply. > > Further, to clear things up w/r/t an earlier suggested solution: > Vout isn't necessarily going into an ADC -- it might very well stay analog, > so the output has to be linear. Seems like it'd be totally doable with a > few op amps -- is that true? > > Thanks again, > Your solution will need a variable-gain device. "Normal" op-amp-resistor circuits aren't enough. Look at National's LMH6503 or similiar. Regards, Mark markrages@gmail.com -- You think that it is a secret, but it never has been one. - fortune cookie -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist