Looking quickly at the prints on the site, the isolation is provided by the transformer, not the active circuitry. The transistors/op-amps are just buffers for the output.
That means that the isolation is determined, for the most part, by the transformer design, so: A bifilar wound torroid would have relatively poor isolation, Two windings on opposite ends of a ferrite rod much better. Some (power line) ultra-isolation transformers have a shield between the primary and secondary, and I don't see any reason that could not be done at RF. The objective is, of course, to minimize the capacitance between the windings. Topaz got 0.001 pF on a 1 kW unit as I remember. -John ================= > Hi, > > I'm curious about the level of isolation that is achieved by an opamp > based > isoamp. I'm referring to ones described here on Bruce Griffiths' page: > http://www.ko4bb.com/~bruce/IsolationAmplifiers.html > > Anyone has a number for this? > > I've tried googling it, but the results are mostly filled with the other > kind of iso amplifier where isolation refers to galvanic isolation. > > Regards, > > Stephan. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.