1. #1

  2. #2
    Quote Originally Posted by thjremy View Post
    Hi,
    Your board looks OK... But the Photocoupler you chose are too slow. 18us for rising time and 18us for falling time... 36us total or a minimum pulse with of about 40 / 45us ... You won't be able to pulse faster than: 1/45us = 22.2KHz Mach3 pulse at 25KHz minimum...

    See datasheet page 2: http://www.if.pw.edu.pl/~alice/DAC/pc847.pdf

    RNR

  3. #3
    vre's Avatar
    Lives in Athens, Greece. Last Activity: 03-08-2016 Has been a member for 2-3 years. Has a total post count of 33.
    Which optocouplers are suitable for high frequency servos breakout (200khz - 500khz) ?

  4. Need more info, e.g. case style, output type, etc. but a generic 2601 is good for 1MHz or higher.

  5. #5
    vre's Avatar
    Lives in Athens, Greece. Last Activity: 03-08-2016 Has been a member for 2-3 years. Has a total post count of 33.
    What you mean case style and output type ?
    Because i can't find generic 2601 from these list which are suitable ?
    10pcs Toshiba TLP785GB Photocoupler Optocoupler DIP-4 DIP New Original items in wellparts store on eBay!

  6. http://www.farnell.com/datasheets/24747.pdf

    tlp785 is too slow, 20kHz max. as will be most 4pin couplers

  7. #7
    vre's Avatar
    Lives in Athens, Greece. Last Activity: 03-08-2016 Has been a member for 2-3 years. Has a total post count of 33.
    i mean which optocoupler from all which are in this list is suitable (not only tlp785/please go to link)
    optocouplers!
    Last edited by vre; 05-01-2014 at 01:13 PM.

  8. Quote Originally Posted by vre View Post
    i mean which optocoupler from all which are in this list is suitable (not only tlp785/please go to link)

    optocouplers!
    You need to do the research and read the datasheets, and if you don't know how to interpret a datasheet then you probably don't have the knowledge to use the part... but I happen to know the 6N137 is an alternative for HPCL2601

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