Opto isolator question

I think I also have 1k and 100ohm resistors as well as 6 pin optos that I forgot I had! :)

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it looks like you have a few options to try if the opto-isolator board does not work

John

... or simplify the whole thing and bin off the board, any isolation and just use the mosfets. What’s the Vgs(on) for the details?

going by figure 6 on page 5 of the pdf data
I would aim for a minimum of 5V

while the absolute maximum ratings for Vgs is +/- 30V
I would limit the maximum to about 20 V

pdf data
Attachment 25990

John

So how would the circuit look if I ditch the opto and connected the mosfet direct to the 5 axis Bob? You'll have to excuse my lack of electronics knowledge, I've occasionally dabbled over the years but i always forget what I learnt!

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you should be able to connect the BOB directly to the FET

Attachment 25991


the 2N7000 would be an alternative FET in a smaller TO92 case

Attachment 25992

John

Cheers John

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Optically Isolated means the input has no current flow or connection to the output, a lot like a Relay!
By using one wire on the output you are connecting your wires to a floating point in your circuit!
The outputs will not work unless both connections are used, you need a common ground or common live to one side of each output in order for there to be any signal at the other side of the output! :D

I was connecting both :) I would of expected the resistance to drop when the opto was activated but nothing seems to change! Anyhow I'll ditch the opto and just use the mosfets

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Not in the photo of your setup which you posted in your first post :D