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  1. 02-08-2018 #23
    john swift's Avatar
    Lives in merseyside, United Kingdom.
    john swift
    Last Activity: 18-01-2021 Has been a member for 9-10 years. Has a total post count of 257. Received thanks 53 times, giving thanks to others 0 times.
    this BOB
    https://www.ebay.co.uk/itm/5-CNC-Axi...4AAOSwaxlZiq98

    is the type of BOB I would use

    Click image for larger version.  Name: ebay CNC BOB (2).jpg  Views: 1225  Size: 260.1 KB  ID: 24620



    it looks like its a version of this BOB found in some control boxes supplied with some 6040 CNC machines

    Click image for larger version.  Name: TX14175 circuit.jpg  Views: 1298  Size: 283.6 KB  ID: 24621

    the TX14175 has the advantage of having a 5V to 5V DC converter to provide the isolated 5V supply for the 75HC245's
    instead of taking a 5V supply from a USB port


    the HDBB2 looks good
    I am not sure why they have used a expensive 36 way centronics connector instead of a 25 way D-type connector


    John
    Last edited by john swift; 02-08-2018 at 10:37 AM. Reason: add ref to HDBB2 BOB
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