D8, D9 and D10 are all low side switching.
What that means is the that positive side is always connected to the supply voltage.
The negative side is switched. Connecting and disconnecting gnd.
If you connect any of these floating gnds to real gnd anywhere then that mosfets are bypassed and the circuit is on.
Secondly Power. On the ramps the power rail is split into two parts the 5 amp and the 11 amp sides
The 11Amp provides power to the D8 mosfet only
The 5 Amp provides power to D9 and D10 (and everything else needing 12v)
Edited 1 time(s). Last edit at 05/31/2022 09:24PM by Dust.