Thread: Opto isolator question
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28-06-2019 #11
I think I also have 1k and 100ohm resistors as well as 6 pin optos that I forgot I had! :)
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28-06-2019 #12
it looks like you have a few options to try if the opto-isolator board does not work
John
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28-06-2019 #13
... 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?
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28-06-2019 #14
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29-06-2019 #15
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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29-06-2019 #16
you should be able to connect the BOB directly to the FET
the 2N7000 would be an alternative FET in a smaller TO92 case
2N7000.pdf
John
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29-06-2019 #17
Cheers John
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29-06-2019 #18
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! :DYou think that's too expensive? You're not a Model Engineer are you? :D
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29-06-2019 #19
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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29-06-2019 #20
Not in the photo of your setup which you posted in your first post :D
Last edited by magicniner; 29-06-2019 at 01:38 PM.
You think that's too expensive? You're not a Model Engineer are you? :D
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