Shematic (differential input)



U1 = OPamp
C1 = unplaced
R6,R8 = 470 Ohms
R3,R4,R5 = 2k2
R1,R2 = 7 Ohms
R9,R10 = 680 Ohms
T3 = BD139
T4 = BD140
T1 = BC550
T2 = BC560
R6 = LOAD

v = 1.0
Iq = ~ 90-100 mA
IR3 = 4.9mA
PlossR = 0,05W  PlossT = 0,55 W (8V) / 0,85W (12V)