Thread: AndyUK's Build - 1.2x1.0m Gantry
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04-02-2020 #11
Hi Doddy,
Thanks - that is quite high praise, but I'm still very much stumbling my way around so don't assume too much!
I hadn't really considered the CTRs of the optoisolators, however is this relevant if I'm effectively connecting each drive in parallel with oneanother? My intuition is only really concerned about the fact that I have the Optoisolator from the drive, and then the one in the OSSD output which as I understand is effectively acting as a transistor to ground. Upstream of the drive is merely the current limiting resistors and the +24V rail. My ~40mA came from the sum of 10mA per drive based on the current limiting resistors, and if the CTR<1 then I shouldn't have damaged anything staying under 70mA.
I suspect I've totally missed the point here though :) Please educate me further!
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