This is an LVDT
I have an application where I need to basically shift the zero point (the position where the two outputs cancel out).
In most applications this is obviously done by physically moving the two pickoff coils :)
I can design an electronic solution but it is not simple. One needs to convert the two AC signals into a DC voltage first, level shift that as required, and re-synthesise the two AC voltages. It's quite a lot of circuitry...
Is there some cunning way to do this, without doing the AC-DC-AC conversion? I am vaguely thinking of using something like a resolver i.e. an iron core with some windings on it.
It would be a fun job to do with a DSP, or actually any half decent microcontroller given that the frequency is only 400Hz. But I am looking for an analog circuit.
I do want the AC output BTW, not DC.
BTW Don Y - if you are reading this, I wouldn't mind your current email address :)