Super Headphone Amplifier

Output Illustration

Spec. of Super Headphone Amp.

Output (in Class A) :
160mW at 8  Ohm
600mW at 30 Ohm
120mW at 600 Ohm

Distortion :
Less Than 0.01% at Normal Outout

Schematic

PCB1

PCB2

Parts List :

Reslstor :
R1,R1',R4,R5,R18,R18' = 1 k
R2.R2',R9,R9',R17,R17' = 22 k
R3,R6 = 27 k
R7,R7' = 220 k
R8,R8',R19,R19' =2k2
R10,R10',R13,R13' = 4k7
R14,R14',R20,R20' = 330 Ohm
R15,R15' = 3k3
R16,R16' = 1k5
R21,R21',R23,R23' = 820 Ohm
R22,R22',R24,R24' = 1 Ohm/1 W Carbon
P1,P2 = 50 k(47 k) Trimpot
P3,P3' = 2k5 (2k2] Trimpot
PAPA' = 10 k Trimpot

Capasitor :
C1,C1',C6,C6' = 22 p/10 V
C2,C3 = 47 uF/4 V
C4,C4' = 220 uF/4 V
C5,C5' = 33 p
C7,C7',C8,C8’ = 100 n

Semi Conductor :
T1...T5,T3',T4',T5'.T10,T11,T11',T12,T12' = BC 550C
T6...T9,T6'...T9',T14,T14' = BC 560C
T13,T13' = BD 139
T15,T15' = BD 140

Other Parts :
F1,F1' =  500 mA Fuse with socket
headsink for T13,T13',T15,T15'