Some of my ideas so far...
I figured I would likely need to amplify
the signal, and I also "planned" on the 556
"Astable/Monostable" thing in order to get
a good square wave output.
Pin 5 (of the 555), the "Control V" pin,
only sets off the timer to cycle (if the V is
too low, the timer doesn't cycle). I need the
timer to continuously generate a pulse, that
varies with the detected V generated by the
coil/magnet (-50mV to +50mV). Then even
when the magnet isn't moving, the timer still
sends a (center) signal to the servo. I need
the servo to move as the magnet does. I'm
supposing also that since the induced signal
navigates - and +, that I would need to have
a circuit (which I found but haven't tried) to
create a "center + voltage" that goes up/down
depending on the coil/magnet generation (V
goes up/down exponentially as the coil's V
goes up/down in either the + or - range). I
just need, I'm guessing, to convert the 4-6V
output from that circuit, to a frequency in
the range I need (1.0ms to 2.0ms), and allow
me to adjust the frequency so I can center
the servo.