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  #1  
Old Fri 09 July 2010, 10:56
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
For the G201, G203, or the G203v stepper drivers, the formula is:

47 X Amps / ( 7 - Amps) = Resistor.

So, for your motor:

47 X 5.6A / ( 7 - 5.6A) = 188K resistor.

A 180K or a 200K 1/4 Watt resistor would work fine ( or any other resistor that is +/- 5% of 188K).
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  #2  
Old Tue 13 July 2010, 07:03
Red_boards
Just call me: Red #91
 
Melbourne
Australia
What a timely post. I was looking at this earlier.
For the MK 9801's:
(47 * 4.1)/(7-4.1) = 66.5 kOhm
Fantastic - this is 4x what I got earlier using the same calculation! A lot to be said for re-reading and re-calculating (and thinner fingers).
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  #3  
Old Tue 13 July 2010, 12:39
Kobus_Joubert
Just call me: Kobus #6
 
Riversdale Western Cape
South Africa
Send a message via Yahoo to Kobus_Joubert Send a message via Skype™ to Kobus_Joubert
Buy the UIM drivers. Amps are set with a onboard potentiometer...no more looking for resistors.
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  #4  
Old Tue 13 July 2010, 15:52
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
The Geckodrive G201X uses an internal dip switch for selecting current limiting resistor values. It has most of the features of the G203v but costs less, $114 plus shipping.
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  #5  
Old Sun 12 May 2013, 23:23
litemover
Just call me: Chris
 
Auckland
New Zealand
Hey Mike,

I was reading the manual and it actually states 47*I/ (7-I). That would be inductance no? Just confirming because on the G203V manual, it specified Inductance as part of the formula, not amps. Any ideas why?

Thanks,
chris
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  #6  
Old Mon 13 May 2013, 03:46
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
From http://en.wikipedia.org/wiki/Electric_current:

The conventional symbol for current is , which originates from the French phrase intensité de courant, or in English current intensity.[3][4] This phrase is frequently used when discussing the value of an electric current, but modern practice often shortens this to simply current. The symbol was used by André-Marie Ampère, after whom the unit of electric current is named, in formulating the eponymous Ampère's force law which he discovered in 1820.[5] The notation travelled from France to Britain, where it became standard, although at least one journal did not change from using to until 1896.[6]
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  #7  
Old Mon 13 May 2013, 04:16
litemover
Just call me: Chris
 
Auckland
New Zealand
Awesome explanation Gerald. Thanks for that! Very educational!
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  #8  
Old Tue 14 May 2013, 17:34
Tom Ayres
Just call me: Tom #117
 
Bassett (VA)
United States of America
Gerald, I don't know if you or wiki contains more knowledge.
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  #9  
Old Wed 15 May 2013, 08:52
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
...Gerald.
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