Hi Chris and all,

This message is more with the LVDT aspect than with the
original LRDT sensor with Sean Morrisseys STM-8 design.

ChrisAtUpw@....... wrote:

> In a message dated 13/11/02, meredithlamb@............. writes:
>
> Regardless, its "still"
>
>> likely the best broadband vertical design around for its
>> cheapest home building approach..... As I recall, one or two people
>> were considering other sensor / amplifier methods outside of the
>> original design, but I've no idea of how that went.
>
>       Agreed, but there are several sensor approaches which can be
> successful. To my mind, there is a distinct shortage of amateur 'off
> the shelf' sensor designs capable of giving near professional
> resolution and stability. There is only one LVDT kit sensor available
> with a PCB, to my knowledge, which can give about 7 nano metres
> resolution at 10 Hz over +/-6 mm, with a max range of +/-12 mm.

Presume its the Italian, Nuova Electronica unit (?), you've been
working with/on over time?

Perhaps the greatest curiosity item I wonder about their
transformer part, is whether its really a precision wound
unit like mentioned as a (professional) necessity as on other web
sites?  It appears to be much like other general looking transformer/s.
Without any access I'd guess its somewhat linearly wound
but no where near precision.

All this is leading up to the question of whether a fairly
linear wound (but not exactly precisely layered) coil "could"
somewhat work simarily (with less sensitivity) with the same
general ferrite core type setup.  Such coils are rather scarce
I'am sure.  It would probably leave out any and all relay coils
on the general "market".  It "might" be more prevalent to
some salvagable coil transformers though.

Just some (unexperienced) thoughts.  I think the Nuova item
costs around $103 US dollars (PCB and LVDT) plus
whatever shipping/handling.  Sometimes I think that a
homebrew LVDT with perhaps a Phillips or Analog IC
(and other parts) might be a cheaper alternative......but
probably more costly for any R&D overall.

Take care, Meredith Lamb




Hi Chris and all,
This message is more with the LVDT aspect than with the

original LRDT sensor with Sean Morrisseys STM-8 design.
ChrisAtUpw@....... wrote:
In a message
dated 13/11/02, meredithlamb@............. writes:
Regardless, its "still"
likely
the best broadband vertical design around for its

cheapest home building approach.....
As I recall, one or two people were considering other sensor / amplifier
methods outside of the original design, but I've no idea of how that went.
     
Agreed, but there are several sensor approaches which can be successful.
To my mind, there is a distinct shortage of amateur 'off the shelf' sensor
designs capable of giving near professional resolution and stability. There
is only one LVDT kit sensor available with a PCB, to my knowledge, which
can give about 7 nano metres resolution at 10 Hz over +/-6 mm, with a max
range of +/-12 mm.
Presume its the Italian, Nuova Electronica unit (?), you've been

working with/on over time?
Perhaps the greatest curiosity item I wonder about their

transformer part, is whether its really a precision wound

unit like mentioned as a (professional) necessity as on other web

sites?  It appears to be much like other general looking transformer/s.

Without any access I'd guess its somewhat linearly wound

but no where near precision.
All this is leading up to the question of whether a fairly

linear wound (but not exactly precisely layered) coil "could"

somewhat work simarily (with less sensitivity) with the same

general ferrite core type setup.  Such coils are rather scarce

I'am sure.  It would probably leave out any and all relay coils

on the general "market".  It "might" be more prevalent to

some salvagable coil transformers though.
Just some (unexperienced) thoughts.  I think the Nuova item

costs around $103 US dollars (PCB and LVDT) plus

whatever shipping/handling.  Sometimes I think that a

homebrew LVDT with perhaps a Phillips or Analog IC

(and other parts) might be a cheaper alternative......but

probably more costly for any R&D overall.
Take care, Meredith Lamb