There are a few differences between the MakerBase 75200 and the Flipsky one.
The 75100 of both models uses 3x INA181 current sense amps which seems to work fairly well.
The 75200 they went with a quad op amp instead of 3 current sense amps.
The MakerBase one uses the SGM8584 while the Flipsky version uses the SGM8634. It’s unclear if this was a change batch to batch, an attempt to fix something, part availability, or something MakerBase does different.
What was clear is the fact that the noise at lower RPMs is pretty bad. Specifically the back emf readings that the STM32 sees.
There is a long thread on it on the VESC discord, but in the end the wave forms on an inrunner motor looked like this with either the shipped firmware or the firmware in this thread
Compare this to something like the Stormcore 100D (DRV8353RS)
Or the SKP Solo (op amps)
and it’s pretty obvious things aren’t right
This mod was made where jruncorn unsoldered the 5v power into the op amp, bent it up, and connected it to the 3.3v rail.
Which made the wave form look like this:
Then Elwin hacked modified the firmware further to average the currents together which made it run really smooth, but it’s not well tested and there may be some drawbacks
The code difference can be seen here (not incorporated into this firmware)
And here was the motor all this was run on. It’s a fairly beefy 8 pole 4kg inrunner
I don’t know if the Flipsky 75200 performs the same, and a lot of people report both versions of this ESC running fine on ebikes and scooters, so depending on the motor or use case, it may be fine for the price… but it’s certainly not the best ESC out there.
Both versions also have this problem where the caps near the inductor for the buck are rubbing on the top case and will probably short out at some point.
(from this video)