Low Cost Isolation Amplifier for Industrial Applications

A Design Idea of mine that appeared in EDN around 2000.  The article appeared with the title ‘Lost Cost . . . ‘ – seems someone got a bit mixed up.  The idea has been referenced in a few papers on the web – always good to see!

Low_cost_isolation_amplifier_suits_industrial_applications

Here’s another one using a delta modulator that also works very well I submitted this to EDN but it was rebuffed.  I guess whoever reviewed the idea wasn’t used to seeing an opto operated in photo-diode mode.

Another Low Cost Isolation Amplifier for Industrial Instrumentation Applications