>
Hi Everybody,

I am sorry to get into this so late, but I have not had the time to
follow everthing.

Michaels modification is definately genial and the way to go !
Vincents works but is risky.

Michaels alters the ozilation at which the rotates. By bypassing
the resistor he is change the speed of at which the motor rotates.
For those who want variable speeds just add a variable resistor
to the normally open switch wiring and you can adjust the speed.

Those of you with excessively fast (or slow) drives could just
directly
use the modification without the switch.

It is all elementary physics my friends. Remember science class in
high
school and many things become alot easier to solve.

>Date: Wed, 18 Nov 1998 21:54:57 -0600
>Subject: [M]: RE: ETX- Simple Drive Mods for $10.50
>
>On Wednesday, November 18, 1998 1:45 PM, Vincent H Chan wrote:
>
>> >
>> > I added a simple mod at a cost of $10.50 to an ETX that provides 2X
>> > sidereal tracking and slowing of the drive. In this way, one can speed
>> > up the drive to remove lash. The speeding and slowing is quite useful
>> > for centering objects- very welcome for high power use.
>>
>> Hi Michael,
>> I've also done similar alterations, however, I found the factory drive
>> speed on my ETX to be a bit too fast. Check out my home page at:
>>
>> http://www.engr.uvic.ca/~vhchan/etx.html
>>
>> for my modifications to the drive system. I'm actually putting 9V
>> across the motor to take up the back-lash, and that still takes a couple
>> of seconds!
>>
>> Bye,
>> Vincent.
>>
>> --
>> University of Victoria web: http://www.engr.uvic.ca/~vhchan/
>>
>
>
>Indeed, Vincent has a even more advanced fix- he isolates the current
>electronics and switches in his circuit which provides variable speeds.
>I have not investigated whether the current ETX motor will handle
>over two times the running voltage,. but Vincent provides adequate
>warnings.
>
>Those with excessively fast (or slow) drives and the skills to build this
>more advanced circuit may want investigate Vincent's web site.

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