Re: [APML] st-4 looses guidestar

["Bobby Middleton" <bobm@koyote.com>]

Thanks for all the suggestions and ideas on my st-4 problems. I've ordered a
set of relays from sbig so we'll see if that was the problem soon. BTW
Michael, I ordered them before your post below. I would have probably
checked your deal out if I had not already ordered.
Bobby


http://www.koyote.com/users/bobm/word.htm
----- Original Message -----
From: Michael Gregory <mikeg@airmail.net>
To: <astro-photo@seds.org>
Sent: Thursday, April 06, 2000 12:40 PM
Subject: Re: [APML] st-4 looses guidestar


> Bobby,
>
>        Be careful to check things out (like Chuck did) if you take the
relay
> out of the circuit.  The relay SBIG is currently using (in mine anyway) is
> designed to handle a maximum current of 1.25 Amps.  Chuck
> mentioned in his article that the relay driver only handles 0.5 Amps.  So
> you lose capacity without the relay.  Relays typically stick because the
> load current is greater than the rated contact current.
>
>       BTW, I found an Aromat relay ($3 from Digikey) that should be
> equivalent to the Idec relay except it will handle two Amps.  I will
> check it out further if you have trouble getting replacement parts.
>
>       My Mountain Instruments mount operates off of a nine Volt
> transistor radio battery, so I doubt that I overload the relays :):).
>
> Mike Gregory
>
>
>
> At 05:57 AM 4/6/00 -0800, you wrote:
> >Bobby,
> >
> >> Chuck, will this modification work just fine with the new AP mounts?
> >
> >This is a question I wish I could easily answer but I need detailed
> >information on each drive which I don't have. All I can do is give the
> >general answer and that is if for each direction the hand controller
> >takes some low positive voltage to ground (like +5 or +12V) then it
> >should work.
> >
> >To be able to positively say I need to see a complete schematic of
> >the drive corrector and those tend to be hard to come by. :-(
> >
> >Chuck <aa6g@aa6g.org>
> >
> >--  APML Archives at <http://www.system.missouri.edu/apml/>  ---
> >                Unsubscribe at <majordomo@seds.org>
> >
>
> --  APML Archives at <http://www.system.missouri.edu/apml/>  ---
>                 Unsubscribe at <majordomo@seds.org>


--  APML Archives at <http://www.system.missouri.edu/apml/>  ---
                Unsubscribe at <majordomo@seds.org>