Hi Dewayne,

Ramsey Electronics "might" have what you want/need.  They
list a Stepper Motor Driver, and a DC Motor Speed Control,
kit/s.  They look to be complete, and I'd guess with minimum
circuitry.  One can also buy a chassis for the specific kit/s.

http://www.ramseykits.com

Click on Hobby Kits, and use the search there.  I've not
bought anything from them, so I can't really recommend them,
but, they've been in business some 30 odd years or so.  Their
items would have to match up with what you have now, or,
are comtemplating getting.

Perhaps the bigger problem is just the motor and/or gears
to be driven with?  One would likely need a "harder to find" DC
motor with a "high" gear speed reduction ratio attachment to
where it can be somewhat controlled/limited.  One might connect
it all up, and simply drive a on/off switch while watching your
SDR monitor I suppose.

I'd think it would be rather very difficult to mechanically match it
all up well.  The motor activation itself might create so much sensor
coil pickup noise from vibration, that the total effort/cost might all
be counterproductive.

If I vaguely remember (?), your unit/s sit on concrete pavers
on bare soil?  If so... the best (and strenuious) next thing is to
actually make a solid concrete pier and house/insulate it.  If
its moderately well done, the number of adjustment trips should
drop considerably.  I had the same problem as you, but the
vault/pier approach really helped alot here.  The bigger the pier
the less the ground water tilt overall.  Insulation is also a must,
the temperature effects do contribute to the metals expansion
and contractions of the seismo/s.

Take care, Meredith

Dewayne Hill wrote:

> I want to make my Lehman self leveling as it is in the crawl space and
> I'm getting to the age I hate
>
> crawling on my hands and knees as I did when I was 3.
>
> What I have in mind, but need help with is to connect a common wire to
> the base plate which in turn
>
> will also put the same electrical potential on the boom as my Lehman
> is all metal. I want to insulate
>
> my boom stops from the base plate and connect a plus voltage to it and
> a minus voltage to the other
>
> stop. When the boom touches one of the stops it will complete a
> circuit that will activate a DC motor that
>
> in turn will driver one of my leveling screws a preset amount of
> rotations or for X amount of time.
>
> What I need help with is a circuit to control the motor. I have read
> that a step motor can have a controller
>
> that will control the number of rotations or steps and then stop.
>
> Can anyone Help?
>
> Regards,
>
> Dewayne Hill



Hi Dewayne,
Ramsey Electronics "might" have what you want/need.  They

list a Stepper Motor Driver, and a DC Motor Speed Control,

kit/s.  They look to be complete, and I'd guess with minimum

circuitry.  One can also buy a chassis for the specific kit/s.
http://www.ramseykits.com
Click on Hobby Kits, and use the search there.  I've not

bought anything from them, so I can't really recommend them,

but, they've been in business some 30 odd years or so.  Their

items would have to match up with what you have now, or,

are comtemplating getting.
Perhaps the bigger problem is just the motor and/or gears

to be driven with?  One would likely need a "harder to find" DC

motor with a "high" gear speed reduction ratio attachment to

where it can be somewhat controlled/limited.  One might connect

it all up, and simply drive a on/off switch while watching your

SDR monitor I suppose.
I'd think it would be rather very difficult to mechanically match it

all up well.  The motor activation itself might create so much
sensor

coil pickup noise from vibration, that the total effort/cost might
all

be counterproductive.
If I vaguely remember (?), your unit/s sit on concrete pavers

on bare soil?  If so... the best (and strenuious) next thing is
to

actually make a solid concrete pier and house/insulate it.  If

its moderately well done, the number of adjustment trips should

drop considerably.  I had the same problem as you, but the

vault/pier approach really helped alot here.  The bigger the pier

the less the ground water tilt overall.  Insulation is also a
must,

the temperature effects do contribute to the metals expansion

and contractions of the seismo/s.
Take care, Meredith
Dewayne Hill wrote:

I want to make my Lehman
self leveling as it is in the crawl space and I'm getting to the age I
hate
crawling on my hands and knees as I did when I was 3.
What I have in mind, but need help with is to connect
a common wire to the base plate which in turn
will also put the same electrical potential on the boom
as my Lehman is all metal. I want to insulate
my boom stops from the base plate and connect a plus voltage
to it and a minus voltage to the other
stop. When the boom touches one of the stops it will complete
a circuit that will activate a DC motor that
in turn will driver one of my leveling screws a preset
amount of rotations or for X amount of time.
What I need help with is a circuit to control the motor.
I have read that a step motor can have a controller
that will control the number of rotations or steps and
then stop.
Can anyone Help?
Regards,
Dewayne Hill