Quote Originally Posted by john swift View Post
looking at the photo of the opto-isolator board
it has 3K resistors fitted as shown on the chinese circuit diagram
so the output current is even more limited

with a 3K or 3.3K resistor between the gate and source of the Fets you have you could wire the opto-isolator to pull the gate upto +12V (half of the 24V supply ) to switch the FET on

Click image for larger version.  Name: opto-isolator with FET lamp driver.jpg  Views: 1874  Size: 187.2 KB  ID: 25986

the BOB is like this I have looked at before
Click image for larger version.  Name: CNC BOB .jpg  Views: 1950  Size: 265.9 KB  ID: 25985

John
Cheers John, look what I just found... seems I may as well use them as I have them lying around

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