ON 20070811@12:11:27 PM at page:
http://www.piclist.com/io/stepper/linistep/lini_wks.htm#39303.9270949074
James Newton[JMN-EFP-786] removed post 39303.9270949074

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Looks great thanks for the insight into the board But damm i cant use it for my bipolar motors ;-(((<!-- 39303.9270949074 EOR -->
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ON 20070813@6:17:36 PM at page:
http://www.piclist.com/io/stepper/linistep/lini_bld.htm#39307.7000810185
James Newton[JMN-EFP-786] removed post 39307.7000810185

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Dear Mr <BR>
Why &quot;You must add two 470 ohm resistors on the bottom of the board and these must be added exactly as shown in this photo (bend and cut the leads to suit and then solder); &quot;<BR>
 AND WHY WEE NEED THEM????? THEY NOT INCLUDE I N THE DESIGN ?<BR>
<BR>
Thanks you<!-- 39307.7000810185 EOR -->

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ON 20070822@1:37:38 PM at page:
http://techref.massmind.org/io/stepper/linistep/blown.htm#39315.7944212963
James Newton[JMN-EFP-786] Published and replied to post 39315.7944212963

|Insert '1. If I understand you question, the answer is: Programatically. The PIC reads the sense resistors and adjusts the PWM of it's output to maintain the appropriate output.

2. If you are referring to the 'scope screen shots on the main page showing the smoothing of the voltages, that is from the output of the TIP122's where the motor coils are attached.' at: '<!-- 39315.7944212963 EOR -->'

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I am trying to understand the schematic and Had a question or two:<BR>
1) How is the TIP 122 base voltage maintained at 2 volts?<BR>
2) Which connection points are you using for input into your scope. ie are you measuring current across the sense resistor?<BR>
<BR>
Nice to see this kind of intellectual property opened to the community, I especially love the RC for smoothing.<BR>
Thanks Allan<BR>
<BR>

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