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Thread: EQ3 drive specs

  1. #1
    Jim's Avatar
    Jim Guest

    Default EQ3 drive specs



    Can someone tell me what voltage the dual-axis drive kit for the EQ3
    takes? I can't seem to find it on the 'Net.

    Thanks.

    Oh, any good UK suppliers for the drives?

    Jim
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  2. #2
    DH's Avatar
    DH Guest

    Default EQ3 drive specs

    Jim wrote:

    It's 6VDC Jim, I know cuz I now have one.... Maplin do 2300mAH NiMH D cells for
    £3-99 a pair, quite a bargain ! Just bought 2 pairs for my drive today.

    Problem is, mine has a dicky N/S switch which Im trying to get swapped out, and the
    RA drive has no clutch, so Im after a couple of gears and shafts to make a
    clutchable 1:1 drive train.

    As for where to go, Barrie at Beacon Hill is a good bloke, as is Bern at Modern
    Astronomy and Steve Rogers at SW Optics. Personal dealings with all three, very
    friendly, knowledgable and always point me in the right direction if they cannot help.

    HTH

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    David Harris
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    g8ina((at))NOSPAMblueyonder(dot)co(dot)uk

  3. #3
    Jim's Avatar
    Jim Guest

    Default EQ3 drive specs

    DH <nowhere@nohow.com> wrote:


    Ah, many thanks.

    I wonder how easy it would be to 'step down' from a 12VDC source...

    Jim
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    event horizons there exist ... special circumstances" - Use Of Weapons

  4. #4
    Jeroen Smaal's Avatar
    Jeroen Smaal Guest

    Default EQ3 drive specs

    >

    As a simple solution, you could put 5 1N4001 diodes (or similar silicon
    diodes with about 1.1 Volt drop and about 1A max current) in series into the
    positive lead. This should step the voltage down to tolerable levels.

    Jeroen.



  5. #5
    Jim's Avatar
    Jim Guest

    Default EQ3 drive specs

    Jeroen Smaal <jsnews@REMOVE-THIS.zippy.xs4all.nl> wrote:


    I think my brain just fused.

    Jim
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    "We deal in the moral equivalent of black holes, where the normal
    laws of right and wrong break down; beyond those metaphysical
    event horizons there exist ... special circumstances" - Use Of Weapons

  6. #6
    Jim's Avatar
    Jim Guest

    Default EQ3 drive specs

    Jeroen Smaal <jsnews@REMOVE-THIS.zippy.xs4all.nl> wrote:


    Sorry, my other reply may have (unintentionally) come over as churlish.

    Thank you for that answer but it would sadly be beyond my skills.

    Jim
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  7. #7
    David Harris's Avatar
    David Harris Guest

    Default EQ3 drive specs

    Jim wrote:



    and it would also blow the diodes as the two motors at max drive take about 2.2 amps !

    Go to Maplins, and ask them for a 6VDC 5 amp regulator chip (a big power
    transistor looking thing). It has circuit diagrams with it, and should drop 12 to
    6 easily enough. Or explain the problem and see what other solutions they offer. I
    could do it for you, BUT by the time you have bought the regulator and a box, you
    may have well bought the four D cells from Maplins for £8 !

    The last option is a small sealed lead acid battery for about 14 quid also from
    Maplins. But then, both rechargeable battery solutions will need chargers....

    Hmmmmmm.....

    Still thinking about cheaper solutions....

    DH

  8. #8
    Jim's Avatar
    Jim Guest

    Default EQ3 drive specs

    David Harris <nowhere@nohow.com> wrote:


    Well, I don't even have the drives yet :-)

    Currently it's just an idea I'm toying with - my HEQ5 mount is already
    driven but my EQ3 isn't. I was just getting a feel for how hard it would
    be to drive it off the same 12VDC rechargeable battery pack I have.

    Many thanks.

    Jim
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  9. #9
    Jeroen Smaal's Avatar
    Jeroen Smaal Guest

    Default EQ3 drive specs


    "David Harris" <nowhere@nohow.com> wrote in message
    news:NcK8e.14604$G8.2464@text.news.blueyonder.co.u k...
    the
    about 2.2 amps !
    drop 12 to
    offer. I
    box, you
    from
    chargers....

    David,

    I have never measured more than about 600 milliAmps on my own EQ3.
    Just to be safe, maybe 2 or 3 Amp diodes would be better. I think this would
    be the simplest to make and very cheap, not much more than a pound (I don't
    live in the UK, so I'm not sure about pricing, but it should not be more
    expensive than this).
    Ask someone with a little bit of electronic skills to solder the diodes
    end-to-end, with the stripes toward the hand controller, solder these into
    the positive lead, and put a bit of insulation around it.

    Jeroen.



  10. #10
    Dr John Stockton's Avatar
    Dr John Stockton Guest

    Default EQ3 drive specs

    JRS: In article <NcK8e.14604$G8.2464@text.news.blueyonder.co.uk> , dated
    Mon, 18 Apr 2005 08:28:29, seen in news:uk.sci.astronomy, David Harris
    <nowhere@nohow.com> posted :

    The OP should look into using a switching regulator; IIRC, it was easy
    enough to build one using RS data sheets, and kits or built ones may be
    available. It would approximately double the time for the 12 V battery
    to run flat.

    He should also look to see whether there are any specs on accuracy or
    stability or impedance applying to the 6 V his system wants.

    If his system includes both electronics and motors, it is conceivable
    that they can be fed independently, in which case the varying motor load
    is not an influence on the regulator for the electronics. This would be
    technically trivial for the manufacturer to design, but might cost too
    much to explain.

    --
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    Web <URL:http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms & links;
    Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
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