With this simple DC voltage converter circuit we can reduce 12v to 5v symmetric voltage and can use existing resources.
Here used 3-Terminal Adjustable Regulator LM317 for positive regulation and LM337 for the negative regulation. The maximum output current is 1A, and as always highly recommend a good heat dissipation for this IC regulator.
The following charts are included to LM317 and LM337 thermal.
Symmetric 12V to 5V converter parts list :
R1 : 1.2K
R2, R3 :120 ohm
VR1, VR2 : 500ohm
C1, C3, C4, C6 : 1uF
C2, C5 : 10uF
D1–D6 : 1N4001
IC : LM317, LM337