Version 4
SHEET 1 5564 772
WIRE 2288 -288 2080 -288
WIRE 2624 -288 2288 -288
WIRE 3040 -288 2720 -288
WIRE 2720 -240 2720 -288
WIRE 2624 -224 2624 -288
WIRE 2624 -224 2528 -224
WIRE 2080 -160 2080 -288
WIRE 2528 -144 2528 -224
WIRE 2624 -96 2624 -144
WIRE 2624 -96 2592 -96
WIRE 2800 -96 2624 -96
WIRE 2944 -96 2896 -96
WIRE 3040 -96 3040 -288
WIRE 3040 -96 2944 -96
WIRE 3040 -80 3040 -96
WIRE 2080 -48 2080 -80
WIRE 2528 -32 2528 -48
WIRE 2528 -32 2464 -32
WIRE 2560 -32 2528 -32
WIRE 2592 -32 2592 -48
WIRE 2592 -32 2560 -32
WIRE 2560 -16 2560 -32
WIRE 2848 0 2848 -32
WIRE 2848 0 2832 0
WIRE 2896 0 2848 0
WIRE 3104 0 2896 0
WIRE 3360 0 3184 0
WIRE 2464 48 2464 32
WIRE 2560 48 2464 48
WIRE 2720 48 2720 -176
WIRE 2720 48 2560 48
WIRE 2736 48 2720 48
WIRE 3472 48 2816 48
WIRE 2832 80 2832 0
WIRE 2896 80 2896 0
WIRE 2464 112 2464 48
WIRE 2464 112 2256 112
WIRE 2560 112 2464 112
WIRE 2736 112 2624 112
WIRE 2656 144 2624 144
WIRE 2688 144 2656 144
WIRE 2896 160 2896 144
WIRE 2896 160 2832 160
WIRE 2688 176 2688 144
WIRE 2256 192 2256 112
WIRE 2464 192 2256 192
WIRE 2480 192 2464 192
WIRE 2608 192 2560 192
WIRE 2656 192 2608 192
WIRE 2736 208 2736 112
WIRE 2736 208 2720 208
WIRE 2832 208 2832 160
WIRE 2832 208 2816 208
WIRE 2848 208 2832 208
WIRE 2944 208 2944 -16
WIRE 2944 208 2928 208
WIRE 2992 208 2992 192
WIRE 2992 208 2944 208
WIRE 3216 208 2992 208
WIRE 3360 208 3296 208
WIRE 3472 208 3472 48
WIRE 3472 208 3360 208
WIRE 2256 224 2256 192
WIRE 2656 224 2608 224
WIRE 3360 240 3360 208
WIRE 3472 240 3472 208
WIRE 2688 320 2688 240
WIRE 2256 336 2256 304
WIRE 3360 384 3360 304
WIRE 3472 384 3472 320
WIRE 2608 448 2608 224
WIRE 2608 560 2608 528
FLAG 2080 -48 0
FLAG 2256 336 0
FLAG 3360 0 0
FLAG 2608 560 0
FLAG 2688 400 0
FLAG 3472 384 0
FLAG 3360 384 0
FLAG 2464 192 a
FLAG 2608 192 b
FLAG 2656 144 +15V
FLAG 2288 -288 +15V
SYMBOL voltage 2080 -176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 44 Left 2
WINDOW 3 24 72 Left 2
SYMATTR SpiceLine Rser=0 Cpar=0.00000
SYMATTR Value 15V
SYMATTR InstName V2
SYMBOL res 2832 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value 15K
SYMATTR SpiceLine tol=1 pwr=0.25
SYMBOL res 2832 224 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R15
SYMATTR Value 100
SYMBOL cap 3344 240 R0
SYMATTR InstName C4
SYMATTR Value 1000n
SYMBOL res 2240 208 R0
SYMATTR InstName R12
SYMATTR Value 5k
SYMBOL res 3456 224 R0
SYMATTR InstName R11
SYMATTR Value 100
SYMBOL cap 2704 -240 R0
SYMATTR InstName C7
SYMATTR Value 1000p
SYMBOL npn 2800 -32 R270
SYMATTR InstName Q2
SYMATTR Value BC847B
SYMBOL res 2608 -240 R0
SYMATTR InstName R20
SYMATTR Value 10k
SYMBOL res 2816 64 R0
SYMATTR InstName R14
SYMATTR Value 1k
SYMBOL res 3200 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R18
SYMATTR Value 10k
SYMBOL res 2928 -112 R0
SYMATTR InstName R24
SYMATTR Value 470
SYMBOL pnp 2592 -48 R180
SYMATTR InstName Q1
SYMATTR Value BC857B
SYMBOL cap 2624 96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 100p
SYMBOL cap 2880 80 R0
SYMATTR InstName C2
SYMATTR Value 1n
SYMBOL res 2720 224 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 22R
SYMBOL voltage 2576 192 R90
WINDOW 123 24 44 Left 2
WINDOW 3 24 72 Invisible 2
SYMATTR Value2 AC 1
SYMATTR Value ""
SYMATTR SpiceLine Rser=0 Cpar=0.00000
SYMATTR InstName V6
SYMBOL Opamps\\LT1678 2688 208 R0
WINDOW 3 15 60 Left 2
SYMATTR InstName U1
SYMBOL voltage 2608 432 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 44 Left 2
WINDOW 3 24 72 Left 2
SYMATTR SpiceLine Rser=0 Cpar=0.00000
SYMATTR Value 2.5
SYMATTR InstName V4
SYMBOL voltage 2688 304 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 44 Left 2
WINDOW 3 24 72 Left 2
SYMATTR SpiceLine Rser=0 Cpar=0.00000
SYMATTR Value -0.15
SYMATTR InstName V8
SYMBOL res 2544 -48 R0
SYMATTR InstName R1
SYMATTR Value 10000
SYMBOL cap 2448 -32 R0
SYMATTR InstName C8
SYMATTR Value 47p
SYMBOL res 3312 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 33
SYMATTR SpiceLine tol=1 pwr=0.25
TEXT 3192 -176 Left 2 !.ac oct 1000 10 5000000
TEXT 2944 -136 Left 2 !.temp 25