MJ2955 / 7806/09 based 6V / 9V PSU 3A assembly notes

Now I have added 2 MJ2955 based heavy duty PSU on top of the 12V 20A PSU.  One PSU is 6V mainly for servo motors, also for stepping motors.  9V and 12V is for stepping motors.  5V is for stepping motor, servo motor, and also for logic circuits.

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