How to modify Questar Powerguide II for GPUSB ?

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rmorein
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How to modify Questar Powerguide II for GPUSB ?

Post by rmorein » Mon Dec 07, 2009 5:06 pm

I would appreciate if you would take a look at the attached schematic, and tell me the best way to proceed.

Bob
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PG2SCH_A.rar
Questar PowerGuide II schematic
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dpanderson
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Re: How to modify Questar Powerguide II for GPUSB ?

Post by dpanderson » Mon Dec 07, 2009 11:46 pm

Bob,

The schematic is not in a format I can open. Could you make a PDF version of it?
Doug Anderson
Shoestring Astronomy
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rmorein
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Re: How to modify Questar Powerguide II for GPUSB ?

Post by rmorein » Tue Dec 08, 2009 5:52 am

It actually is a pdf, compressed. The board server would not accept a bare pdf, so I compressed it with winrar, http://www.rarlab.com/.

I have uploaded the same compressed as a zip file.
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PG2SCH_A.zip
PowerGlide II schematic, pdf compressed to zip
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dpanderson
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Re: How to modify Questar Powerguide II for GPUSB ?

Post by dpanderson » Tue Dec 08, 2009 8:33 am

Bob,

This should be very easy to modify. Using an RJ12 connector and the pin numbering shown on page 2 of http://store.shoestringastronomy.com/do ... idance.pdf, wire as follows:

Pin 2 (ground) to the ground node of the Powerguide.
Pin 3 (RA+) to S4 (East) switch
Pin 4 (Dec+) to S2 (North) switch
Pin 5 (Dec-) to S5 (South) switch
Pin 6 (RA-) to S3 (West) switch
Doug Anderson
Shoestring Astronomy
http://www.ShoestringAstronomy.com

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