Opto isolator question

[CharlieRam]

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

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[john swift]

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

John

[Doddy]

... 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?

[john swift]

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


John

[CharlieRam]

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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[john swift]

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

[CharlieRam]

Cheers John

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[magicniner]

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

[CharlieRam]

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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[magicniner]

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