Electronics > Projects, Designs, and Technical Stuff
Long cables...
Siwastaja:
Optocouplers are great when you have any chance of having accidental ground loops, causing massive DC currents and blown things. They are not always that great for noise; noise is easy to filter anyway. If you are the one who wires the mechanical switches, I wouldn't care too much. Optocouplers are almost a must in industrial modules where anyone can screw any type of signal source to the connectors, often introducing ground loops.
guimtl:
time flys. didn't have much time last week to look into the first design tests. (*and still waiting for customer downpayments: -DD )
browsed around and found this; https://www.mouser.ca/datasheet/2/40/w2fw3f-776152.pdf
around page 10 it start to discuss the EMI filtering.
what do you guys think about those for filtering.. might get way more simple than using the ferrite.. ?!
radio <--> mcu <--> i2c / interrupt <--> multiplexer <-- filtering <--long cable <--contacts.
Siwastaja:
Special physical arrangement capacitors like X2Y or feedthrough capacitors have been discussed multiple times. Some people do find some measurable differences, but others end up pointing that using bog standard capacitors are almost similar in performance. The trick is to use smallest physical size (0402 being a good compromise; it's still hand-solderable), and well placed ground vias (like using two instead of one for a single capacitor, as close as you can without risking tombstoning in reflow, on a 4-layer PCB. Now, using these techniques is equally important for such X2Y or feedthrough capacitors, they can't do the magic without proper layout either, so...
No, I don't think you need these overengineered parts, IMHO.
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