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Optocoupler sharing GND

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mrburnzie:
Hi everyone!

I'm trying to isolate my 12V switches. I'm using an optocoupler TLP291 (4 channel).
The same 12V powersupply is powering the board (with a 3.3V regulator) and the switches.


--- End quote ---


This is my schematic. The same GND is used on the LED and the phototransistor side. Is this good for isolating? (I guess not)
All the time I'm seeing optocouplers used in situations where the GND are NOT the same.

What should I do? Any suggestions?

wraper:
It is not isolation if there is any connection between both sides.

--- Quote ---What should I do?
--- End quote ---
Not have connection between optocoupler sides.

mrburnzie:
https://www.allaboutcircuits.com/projects/how-to-eliminate-ground-loops-with-signal-isolation/
Something like this?

SiliconWizard:

--- Quote from: mrburnzie on July 02, 2020, 04:31:53 pm ---This is my schematic. The same GND is used on the LED and the phototransistor side. Is this good for isolating?

--- End quote ---

It's not.

Just connect the LEDs' cathodes to the ground (reference) of your control signals.

mrburnzie:
Can you please clarify?

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