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Thread: Breakout Board

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  1. #1
    croy's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 26-09-2012 Has been a member for 9-10 years. Has a total post count of 29.
    Hi to all,

    I am looking to make a breakout board with full opto-isolation on Outputs and Inputs as well as 2x dedicated 10A relays.

    The uses will be able to select from a further combination of;
    a) 2 out of 3 comprising 1x 10A relay, Charge pump and 0-10V for Spindle control.
    b) Channel Y Step and Dir or Chan Y Step and Relay no4 (10A relay)


    i believe this board will adequatly cover Lathe and Milling use.

    Who of you would have an interest in using such a board.
    Last edited by croy; 30-07-2011 at 04:56 PM.
    Regards,
    Roy Stark

  2. #2
    Roy, What is needed is a RELIABLE board that can handle 2 relays, charge pump and 0 - 10v
    Can't see a need for opto's on motor outputs as most decent drivers are opto'd anyway, what is needed is fast opto's on inputs, especially the one needed for threading.

    A lot of the boards out there at the moment are right on the edge as regards design and component choice.
    Drop me a line off list [email protected]
    John S -

  3. #3
    It really is not hard to make a reliable breakout board. I designed/made some a few years ago with optoisolation on the I/O since it was before I got the isolated drivers. Simple to not have isolation one outputs...

    How fast do you need the inputs?

  4. #4
    croy's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 26-09-2012 Has been a member for 9-10 years. Has a total post count of 29.
    Quote Originally Posted by Jonathan View Post
    It really is not hard to make a reliable breakout board. I designed/made some a few years ago with optoisolation on the I/O since it was before I got the isolated drivers. Simple to not have isolation one outputs...

    How fast do you need the inputs?
    still a little uncertain so advice will be grateful. from what i remember, parallel ports struggle much above around 330KHz. unless you know otherwise.
    Regards,
    Roy Stark

  5. #5
    Quote Originally Posted by croy View Post
    still a little uncertain so advice will be grateful. from what i remember, parallel ports struggle much above around 330KHz. unless you know otherwise.
    Thinking about it Kernel speed in mach3 is generally 25kHz, some will run at 35kHz. So ideally you want a bit more than that ... there are plenty of opto-isolators available that run much much faster than that.

  6. #6
    croy's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 26-09-2012 Has been a member for 9-10 years. Has a total post count of 29.
    My board will be ready in September, for those of you who are interested:

    Features:
    · Onboard high voltage regulator (70V Max)
    · Dual power supplies;
    o One 5V DC for the Parallel Port associated logiclevel circuitry.
    o One isolated 12V DC to drive port-opto circuitry.
    · Integrated Charge Pump for added protection, withoverride jumper for testing.
    · Full optical isolation of all inputs.
    · Buffered 2x relays, rated at 10 Amps 240V AC.
    · The user will be able to select from a further combination of;
    a) 2 out of 3 comprising 1x 10A relay, Charge pump and 0-10V for Spindlecontrol.
    b) Channel Y Step and Dir or Y Step and Relay no4 (10A relay)

    · Opto isolators can handle step signals up to 40 KHz
    Regards,
    Roy Stark

  7. #7
    Good to see that you appear to be doing the isolation properly...more than can be said for some.

    You could add an option for a different voltage range for spindle control.

    40 kHz is a bit low. Most will only run at 25-35kHz with Mach3, but you can have more and a lot of drivers claim to do 200-300kHz.

  8. #8
    croy's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 26-09-2012 Has been a member for 9-10 years. Has a total post count of 29.
    actually the components i have used are rated at 80kHz, i am just being cutious.
    Regards,
    Roy Stark

  9. #9
    Quote Originally Posted by Jonathan View Post
    40 kHz is a bit low. Most will only run at 25-35kHz with Mach3, but you can have more and a lot of drivers claim to do 200-300kHz.
    The opto isolation is only on the inputs.
    Driver outputs reply on the driver isolation
    John S -

  10. #10
    Quote Originally Posted by John S View Post
    The opto isolation is only on the inputs.
    Ok, didn't realise that as it wasn't stated in the info...40kHz is obviously plenty for the inputs.

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