Version 4
SHEET 1 880 852
WIRE 432 -64 -160 -64
WIRE 128 80 -80 80
WIRE -160 176 -160 -64
WIRE 96 192 96 176
WIRE 256 192 96 192
WIRE 320 192 320 48
WIRE 96 208 96 192
WIRE 256 240 256 192
WIRE 32 256 0 256
WIRE -80 272 -80 80
WIRE -80 304 -80 272
WIRE 112 304 96 304
WIRE 224 304 176 304
WIRE -160 320 -160 256
WIRE -112 320 -160 320
WIRE 128 320 128 160
WIRE 128 320 64 320
WIRE 0 336 0 256
WIRE 0 336 -48 336
WIRE 96 336 96 304
WIRE 128 336 96 336
WIRE 320 336 320 288
WIRE 432 336 432 -64
WIRE 432 336 320 336
WIRE 480 336 432 336
WIRE -112 352 -384 352
WIRE 224 352 224 304
WIRE 64 368 64 320
WIRE 96 368 64 368
WIRE 112 368 96 368
WIRE 176 368 176 304
WIRE 320 384 320 336
WIRE -80 400 -80 368
WIRE 560 400 560 336
WIRE -384 416 -384 352
WIRE 0 416 0 336
WIRE 32 416 0 416
WIRE -160 432 -160 320
WIRE -800 448 -800 400
WIRE -720 448 -720 400
WIRE -576 448 -576 400
WIRE -496 448 -496 400
WIRE 96 480 96 464
WIRE 256 480 256 432
WIRE 256 480 96 480
WIRE 96 496 96 480
WIRE 128 512 128 336
WIRE -800 544 -800 528
WIRE -720 544 -720 528
WIRE -576 544 -576 528
WIRE -496 544 -496 528
WIRE -384 544 -384 496
WIRE -160 544 -160 512
WIRE -80 592 -80 400
WIRE 128 592 -80 592
WIRE 320 624 320 480
FLAG -160 544 0
FLAG -800 544 0
FLAG -720 544 0
FLAG -576 544 0
FLAG -496 544 0
FLAG -800 400 +30V
FLAG -720 400 -30V
FLAG -576 400 +15V
FLAG -496 400 -15V
FLAG -80 272 +15V
FLAG -80 400 -15V
FLAG 320 48 +30V
FLAG 320 624 -30V
FLAG -384 544 0
FLAG -384 352 Vin
FLAG 432 336 VOut
FLAG 560 400 0
FLAG 224 352 0
SYMBOL npn 32 208 R0
SYMATTR InstName Q1
SYMBOL pnp 32 464 M180
SYMATTR InstName Q2
SYMBOL res -144 272 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 20000
SYMBOL res -144 528 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL voltage -800 432 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 30
SYMBOL voltage -720 432 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value -30
SYMBOL voltage -576 432 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 15
SYMBOL voltage -496 432 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value -15
SYMBOL voltage -384 400 R0
WINDOW 3 24 160 Left 0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value SINE(0 1 20K)
SYMATTR Value2 AC 1
SYMATTR InstName V5
SYMBOL res 464 352 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R5
SYMATTR Value 8
SYMBOL Opamps\\LT1001 -80 272 R0
SYMATTR InstName U2
SYMBOL npn 256 384 R0
SYMATTR InstName Q3
SYMBOL pnp 256 288 M180
SYMATTR InstName Q4
SYMBOL diode 176 288 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName D1
SYMBOL diode 112 384 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D2
SYMBOL res 112 64 R0
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL res 112 496 R0
SYMATTR InstName R4
SYMATTR Value 100
TEXT -696 280 Left 0 !.tran 0.002
TEXT -480 288 Left 0 !;ac oct 10000 10 100000