Version 4
SHEET 1 1804 680
WIRE 976 -176 944 -176
WIRE 1120 -176 1056 -176
WIRE 464 -96 64 -96
WIRE 720 -80 592 -80
WIRE 464 -32 464 -96
WIRE 64 16 64 -96
WIRE 96 16 64 16
WIRE 208 16 208 -16
WIRE 208 16 176 16
WIRE 240 16 208 16
WIRE 352 16 320 16
WIRE 656 16 656 -16
WIRE 592 32 592 -80
WIRE 624 32 592 32
WIRE 1008 32 1008 -80
WIRE 1120 32 1120 -176
WIRE 1216 32 1120 32
WIRE 1408 32 1280 32
WIRE 1456 32 1408 32
WIRE 720 48 720 -80
WIRE 720 48 688 48
WIRE 768 48 720 48
WIRE 944 48 944 -176
WIRE 944 48 848 48
WIRE 976 48 944 48
WIRE -32 64 -112 64
WIRE 64 64 64 16
WIRE 64 64 32 64
WIRE 464 64 464 48
WIRE 624 64 464 64
WIRE 1120 64 1120 32
WIRE 1120 64 1040 64
WIRE 464 80 464 64
WIRE 976 80 944 80
WIRE -112 96 -112 64
WIRE 64 112 64 64
WIRE 96 112 64 112
WIRE 208 112 176 112
WIRE 240 112 208 112
WIRE 352 112 352 16
WIRE 352 112 320 112
WIRE 656 112 656 80
WIRE 1120 112 1120 64
WIRE 1456 112 1456 32
WIRE 1008 128 1008 96
WIRE 208 160 208 112
WIRE 352 192 352 112
WIRE 464 192 464 160
WIRE 464 192 352 192
WIRE 896 192 896 160
WIRE -112 224 -112 176
WIRE 1120 224 1120 192
WIRE 1456 224 1456 192
WIRE 896 288 896 272
WIRE 976 288 896 288
WIRE 896 320 896 288
WIRE 1280 384 1280 352
WIRE 896 496 896 400
WIRE 1280 496 1280 464
FLAG 208 160 0
FLAG 208 -16 VCC
FLAG -112 224 0
FLAG 656 112 0
FLAG 656 -16 VCC
FLAG 1008 -80 VCC
FLAG 1008 128 0
FLAG 1120 224 0
FLAG 896 496 0
FLAG 896 160 VCC
FLAG 976 288 VDD2
FLAG 944 80 VDD2
FLAG 1280 496 0
FLAG 1280 352 VCC
FLAG 1456 224 0
FLAG 1408 32 HEADPHONE
SYMBOL polcap 32 48 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 470ľ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=6.3 Irms=445m Rser=0.17 MTBF=1000 Lser=0 ppPkg=1
SYMBOL res 192 0 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 39.2K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 192 96 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 39.2K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 336 0 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 1K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 336 96 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 1K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Misc\\signal -112 80 R0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMBOL Opamps\\UniversalOpamp 656 48 R0
SYMATTR InstName U1
SYMATTR Value2 Avol=1Meg GBW=5Meg Slew=2Meg
SYMATTR SpiceModel level1
SYMBOL res 448 64 R0
SYMATTR InstName R5
SYMATTR Value 100k
SYMATTR SpiceLine tol=1
SYMBOL res 448 -48 R0
SYMATTR InstName R6
SYMATTR Value 0.1
SYMATTR SpiceLine tol=100k
SYMBOL res 864 32 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R7
SYMATTR Value 20K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Opamps\\UniversalOpamp 1008 64 R0
SYMATTR InstName U2
SYMATTR Value2 Avol=1Meg GBW=5Meg Slew=2Meg
SYMATTR SpiceModel level1
SYMBOL res 1072 -192 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R8
SYMATTR Value 100k
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 1104 96 R0
SYMATTR InstName R9
SYMATTR Value 15K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 880 176 R0
SYMATTR InstName R10
SYMATTR Value 50k
SYMATTR SpiceLine tol=1
SYMBOL res 880 304 R0
SYMATTR InstName R11
SYMATTR Value 50k
SYMATTR SpiceLine tol=1
SYMBOL voltage 1280 368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 4.2
SYMBOL res 1440 96 R0
SYMATTR InstName R12
SYMATTR Value 300
SYMATTR SpiceLine tol=1
SYMBOL polcap 1216 48 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C2
SYMATTR Value 2200ľ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=6.3 Irms=1.4 Rser=0.042 MTBF=2000 Lser=0 ppPkg=1
TEXT -144 504 Left 0 !.ac dec 100 1 100k
TEXT 416 224 Left 0 ;AD5242
TEXT 1040 440 Left 0 ;LM4881
TEXT 1472 72 Left 0 ;headphone load
TEXT -120 -200 Left 0 ;Copyright 2007 Head-HIFI.com
TEXT -112 320 Left 0 ;This is one of two identical HA-1 audio channels. The purpose of this \nsimulation is find the overall frequency response. By changing the input\nand output capacitor values it can seen that the frequency response\nchanges. The HA-1 could use smaller capacitors but the largest capacitors that \nwould fit in the enclosure were used to give the absolute best performance.
RECTANGLE Normal 544 240 368 -128 2
RECTANGLE Normal 1184 464 864 -64 2
RECTANGLE Normal 1696 208 1408 48 2