Page 2 of 2 FirstFirst 12
  1. #11
    For pull up resistor calculations you must consider the current passing through the line. Most diodes require 20mA maximum, so around 15mA will be safe to work with. Based on the diagram, for a 5V supply the pull up resistor (22K) is quite high; remember that there will also be a voltage drop in the opto-isolator.

    pcb quote
    Last edited by danilo; 29-07-2015 at 08:29 PM.

Page 2 of 2 FirstFirst 12

Similar Threads

  1. CNC 3020 Enclosure/Upgrade
    By Pointy in forum Electronic Project Building
    Replies: 59
    Last Post: 27-10-2014, 09:20 PM
  2. My first bits of work from a chinese 3020 cnc
    By Jester in forum Woodworking Project Showcase
    Replies: 11
    Last Post: 02-02-2014, 11:08 AM
  3. eBay: Denford Novamill SmartStep Control Board + Spindle Board
    By danielbriggs in forum Items On eBay UK
    Replies: 0
    Last Post: 30-05-2013, 05:52 AM
  4. is a cnc 3020 right for the jobs i need doing
    By RsvRcarl in forum Milling Machines, Builds & Conversions
    Replies: 3
    Last Post: 28-03-2012, 12:34 AM
  5. Improving your CNC3040/3020
    By DanielF in forum Motor Drivers & Controllers
    Replies: 0
    Last Post: 22-11-2011, 12:48 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts