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About the picture (do not understand ? ) with resistors R4 and R3 , @ 250V ac, peak 400 Vdc). Be aware that resistors are specified with a rating voltage (... 100V ?)... if you use SMD parts ... Verify that 2 resistors are enough. Why not used a transmission throug nRF circuitry ? All problems are resolved about isolation.


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The best way I found is to use ADUM120N (or there are others that are wider than two signals.) Source: https://www.analog.com/media/en/technical-documentation/data-sheets/ADuM120N_121N.pdf You need a lot of them for the 14 signals on the UPLI bus (at least 7 if your running the ADUM120. But they get the job done. They run at 150Mbps with a ~7ns propagation ...


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Option 3: Pigtail out all wires off the board with high gauge (like AWG22 or AWG18, whatever fits in the through hole) so everything is easily accessible. *maybe an inch or half inch of wire. If your ground is on the 1 or 2 layer, you could just scrape off the soldermask to get to it or solder to another component ground. Keep in mind this will add a small ...


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Unfortunately, the common pin 6 needs not just a wire, but a fairly low impedance one depending on how much imbalance current there is between Vout+ and Vout-. If your common ground is nearby this shouldn't be a problem. So a couple of ways to deal with this. Option 1: Carefully drill the PCB with hole for the missing pin, making sure your inner layers aren'...


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Isolation is your tool to make sure crazy currents don't trigger digital signals or mess with analog signals. Since it's "just" a drone, you don't need isolation same way it's required in industrial applications. So to your question, if you can be sure you design the current flow such a way you don't get grounds bounced each time a motor is turned ...


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The power must be supplied to all from the LiPo, with step down voltage regulator on controller board... Will ground bounce be induced if the ESC connectors are on one board, and the controller board is completely separate? If they are all supplied from the same power source than they cannot be completely separate. To prevent problems due to current flowing ...


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You can use coaxial cables, along with attenuators, power combiner/splitters and directional couplers. You can do it on a PCB, but the solution will be quite big and signals from different transceivers will couple to each other, unless you have a strict RX/TX scheduling. A better solution would be optical transceivers + fiber, even for short runs inside an ...


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Devices like the LTC1785 RS485 transceiver can tolerate up to 60V on the bus lines. Replace the 75176 or MAX485 chips with the LTC1785 and the problem is solved.


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First and foremost, grounding is needed, period. People who say grounding is not needed have no idea what they are talking about. Once you truly comprehend how dangerous high voltage live AC is, how electricity behaves and works and why grounding is valuable, you'll understand why grounding is mandatory. It is about safety. Yes, it is true that touching the ...


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