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Posted by BlRDMAN | Nov 27, 2021 @ 01:38 AM | 24,631 Views
Piggy backing fets has been done by many. Link shows XP-3A as an example.

https://www.hacksmods.com/2012/04/ho...brushless-esc/

Pic is one I did for Genius CP around 2012 2014. Most recently did a MX-3A.
Posted by BlRDMAN | Nov 27, 2021 @ 01:28 AM | 19,545 Views
I believe this feature of the MX-3A ESC is unknown to most. This esc in its stock form is programmed to accept pwm input of 1kHz, 2kHz, 4kHz and 8kHz with a simple modification. Simply add R1 and R2 resistors (form a voltage divider), value is 1K, size is 0402. This size resistor is "small" but can be done with most ordinary iron with a sharp tip. I have soldered many components this size with a dirty old 40W Weller soldering iron.

Hint, find any copper rod, rivet or similar of correct diameter to fit your iron and sharpen to a point, round point ever so slightly. Clean and tin as it heats up.

Cheers