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  1. #11
    adding more detail to post 7 for any one wanting to use a BOB with opto-isolated outputs and stepper drivers with opto-isolated inputs


    the problem with the BOB supplied as part of the kit is ue use of the slow PC817 opto-isolators used for the outputs


    I would expect the DM860A stepper drivers would have a PC817 on the enable input and a high speed isolator like a HCPL2531 for the step and direction inputs
    as used on this Tormach driver input

    Click image for larger version. 

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    the diagram is from
    https://www.cnczone.com/forums/torma...ml#post2107952


    if I used a breakout with opto-isolated outputs then I would look for a BOB like this -

    https://cnc4you.co.uk/resources/Brea...ard%20HG08.pdf

    or this

    http://www.electronics-lab.com/proje...r-cnc-routers/

    they are just two of example found


    John
    Last edited by john swift; 04-11-2018 at 11:23 AM.

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