just like this (if the diagram doesn't make sense, copy it to notepad or use fixed-size fonts):


+--------------+
! !
+-------------+ 8051 module !
! ! !
! +--------------+
!
! +--------+
! ! !
! +--------+ servos !
! ! ! !
----- 9V ----- 6V +--------+
--- ---
! !
! !
! !
+-----------+
!
--+-- GND
---
-