On Sun, 01 Apr 2007 13:32:44 +0100, Peter Clifton wrote: > On Sat, 2007-03-31 at 22:37 -0400, DJ Delorie wrote: >> So, would an isolated probe need an isolated power supply also? Those >> could get expensive. Isolated power supply, opto-isolated digital gain >> control, opto-isolated return data stream, etc. > > Yes, but they can be done very simply, or picked up as ready built and > encapsulated modules. > > All it needs is a small ferrite transformer
Or even simpler, supply the instrumentation amp with 9V power packs. Even a cheap, wall bug with rectified regulated voltage will do, if all voltages are low enough. This is how I did it, when I needed a differential probe without the notorious groundloop. ---<(kaimartin)>--- -- Kai-Martin Knaak http://lilalaser.de/blog _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
