4in1 ESC Noise Ruins Video
The MOSFET’s on your ESC switch thousands of times per second and creates EMI (electromagnetic interference) that can affect your FC – your gyro, MCU etc. If your camera and VTX are connected to the FC, your video might get noisy too.
This is not a problem with single ESC which is normally mounted on the arms, far away from the FC. It’s 4in1 ESC that can cause problems, especially when you have a power hungry build, running higher voltage like 6S, or in an extremely low profile stack.
“Hiding” FC from ESC Noise
When mounting your 4in1 ESC, put the MOSFET side facing away from the FC if possible.
It would also help if you can keep the distance between ESC and FC, the further the better. But sometimes we have to keep the stack compact in order to fit in low profile frames, in which case you might want to use some sort of shielding between the ESC and the flight controller.
Some ESC comes with shielding, as an example, the Holybro Tekko32 4in1. They added the copper tape in later batches, as the early batches were giving users too much noise without it.
Some 4in1 ESC comes with a heavy heatsink covering all of the FET’s which also acts like shielding, like the HGLRC Forward 65A we checked out recently.
If your 4in1 ESC has none of this shielding, you can buy some. It weights and costs close to nothing, and it would be useful as precaution too for your new builds.
At the time of writing, Diatone is the only one who makes this kind of shielding. Simply put it between the ESC and the FC (as close to the FC as possible) will shield the FC away from the noise coming from the ESC. Comes as 30x30mm and 20x20mm bundle for different stack sizes.
With Diatone’s shielding, make sure to solder a wire to the shielding’GND pad to a ground pad on your FC for maximum effectiveness.