PSN-L Email List Message

Subject: Re: VBB Drawings
From: barry lotz gbl@.......
Date: Mon, 24 Jan 2000 19:31:10 -0800

Hi Rex
    I was reviewing your drawings and had a question about the bridge and
subsequent circuit. STM's drawing shows the ref oscillator going into an
inverting configured amp with gain of 100, followed by an inverting amp with
gain of one. They both go into different pins of the demodulator. As I read
your drawing ,  you have two inverting amps with gain of 100 connected to
the bridge ends.  Is this equivalent? I don't know. It seems in your circuit
that the two amps would have the same sign where in STM's circuit they are
of opposite sign. Karl's lvdt demodulator( which I currently use) is more
like STM's in that one uses the switch to selectively choose one signal or
the other depending on sign ( a rectifier).


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Larry Cochrane <cochrane@..............>