This is just some notes about the PWM schematics for the HF/Grizzly controller.
(HF-PWM.png)


Pins 4 and 11 are the V+ and V- on the op-amps respectively.


Pin descriptions:

V+ = positive voltage rail, also positive voltage for the op-amps, +170V

VD = Ground rail, 0V

VR = virtual ground for op-amps, +158V

VG = virtual negative rail for op-amps, +146V

A = Unknown

B = motor current feedback

C = PWM output to optoisolators which drive MOSFET's


These pins connect to the "mainboard" of the controller and match up to the schematic in file "ESC_GR1.gif"



If any on this needs clarification just email me!
cbaugher@bluegreenlabs.com

Chris