If you change R4 so the servo sits in the middle, then small signals on the CV side should move it a little. Whether you amplify this voltage, or you sensitize the servo, this is much more effective than putting your 160 ohm coil in series with 15k.
I did change R4 (I think it's c 4.7k) so the servo
is in the center, before I added my coil. I even have a
pot to adjust it's center. Basically, what I'm looking
to do is build a "Servo Stretcher", as the internet coins
a relatively inexpensive device on the market. I just
want the whole "sensor" part of the seismograph on
one board, without the stretcher(s?) in the midst of
the servo's wiring. How else, does anybody know, I
could
exponentially expand the pw (I still have
to stay in the same range and keep center). So, say
1.5ms is center, and I send it 1.6ms, I want the servo
to react as if it's getting 1.7ms pw. Conversely, if it
gets 1.4ms, react as if it's getting 1.3ms pw. My only
thought aside of integrating a stretcher(s?) onto my
board, is by "fooling" the servo's pot. Does anybody
know how I could (in any other way), exponentially
expand the pw that I'm sending to the servo while
maintaining the servo's center point?
I know, you wrote of changing the value of R4 so
the CV is more sensitive, but my other problem is if I
do the VCO, CV will also be getting negative voltage
from the coil. I would have to not only amplify this
signal, but build a circuit (which I do have) that will
take the coil's Vout and center it at a few volts while
either lowering or raising it's Vout depending on the
coil's polarity and generation of voltage. This circuit
requires a + and a - voltage supply, which I don't
have (so build another circuit). Now, with my reduced
space, I've probably tripled? the circuits space, and
since it's battery operated, I'm quadrupling? the draw,
compared to what I have so far. There's just got to
be an easier way to make the servo swing farther, on
the circuit I have that actually operates ideally, aside
of the sensitivity, when it comes to servo motion.