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Circuit transfers resistance value through isolation barrier

Posted: 21 Jan 2011 ?? ?Print Version ?Bookmark and Share

Keywords:resistance value? isolation transformer? voltage divider?

The circuit described in this application note monitors a resistance value in a noisy or otherwise hostile environment. Connected across the secondary winding of an isolation transformer, the unknown resistance reflects to the primary where it forms a voltage divider with a 2.2k resistor. The divider produces a reduced-amplitude clock signal that is capacitively coupled, rectified, and filtered to produce a dc output voltage corresponding to the monitored resistance.

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