At 09:15 PM 6/13/01 -0400, you wrote: >Can you stick a resistor in series with the probes, in the range of 1 to 100 >ohms? > >If you can, then amplify the AC voltage measured across the resistor and >rectify it. If you need good linearity you can use an op-amp based active >rectifier. Or, more crudely, just allow a bit of voltage drop. With 16VAC to play with there's =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 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 Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.