R5 = R7 = R12 = 1K
R = 10 k
U1 = LM324
U2 = 7805
U3= 4081
U4 =LM324
Q2 = Q4 = Q6 = Q8 = IRF540
Q1 = Q3 = Q5 = Q7 = IRF9640
DZ = 2.7v OR 2.1v
D16 =1N5401
D = 1N4007
C3 = C9 = 3300uF/35v
C4 = 1000uF/16v
C7 = 1000uF/35v
C = 100nF/50v




