I just went to Mouser.com and did a parts search. It is really easy to find low cost optical isolators that runs at 20MHz. 20Mhz seems to the common rate for modern parts but if you look for faster parts you can find 50Mhz without having to spend over $4 each.
If you really need very high speed you'd use a tiny one inch long fiber optic cable for isolation but that costs more. These run at the GHz range. and required specialist engineering skills to use. But in any case normal hobbyists can do 20MHz without need for "exotic" parts. The $2 parts from Mouser or Digikey would work. But can your stepper motor run that fast? I wonder what the upper limit is. It is like a function of the motor inductance and how many volts you can spell put into the motor. On Sat, Aug 26, 2017 at 5:00 AM, Gene Heskett <[email protected]> wrote: > On Saturday 26 August 2017 07:38:28 Mark wrote: > > At one point in the video they talk about very high frequency drivers, > but you can't get much over 250 kilohertz through an opto-isolator > reliably. BTDT with my own testing, So unless they are using the > capacitive couplers even in their motor driver hardware, an expensive > item, they are full of it. > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
