Version 4
SHEET 1 1400 680
WIRE 688 -80 -144 -80
WIRE -16 -32 -48 -32
WIRE 80 -32 48 -32
WIRE -144 16 -144 -80
WIRE 272 32 240 32
WIRE 368 32 336 32
WIRE -48 64 -48 -32
WIRE -16 64 -48 64
WIRE 80 64 80 -32
WIRE 80 64 48 64
WIRE -144 160 -144 96
WIRE -48 160 -48 64
WIRE -48 160 -144 160
WIRE -16 160 -48 160
WIRE 144 160 128 160
WIRE 240 160 240 32
WIRE 240 160 224 160
WIRE 272 160 240 160
WIRE 576 160 576 144
WIRE 80 176 80 64
WIRE 80 176 48 176
WIRE 128 176 128 160
WIRE 128 176 80 176
WIRE 368 176 368 32
WIRE 368 176 336 176
WIRE 464 176 368 176
WIRE 544 176 464 176
WIRE -16 192 -48 192
WIRE 272 192 240 192
WIRE 688 192 688 -80
WIRE 688 192 608 192
WIRE 752 192 688 192
WIRE 544 208 512 208
WIRE -48 240 -48 192
WIRE 240 240 240 192
WIRE 512 320 512 208
WIRE 544 320 512 320
WIRE 688 320 688 192
WIRE 688 320 624 320
WIRE -48 352 -48 336
WIRE 80 352 80 336
WIRE 256 416 224 416
WIRE 384 416 320 416
WIRE 512 416 512 320
WIRE 512 416 448 416
WIRE 560 416 512 416
WIRE 688 416 624 416
WIRE 784 416 752 416
WIRE -48 448 -48 432
WIRE 80 448 80 432
FLAG 80 448 0
FLAG -48 448 0
FLAG 80 336 V+
FLAG 304 144 V+
FLAG 304 208 V-
FLAG -48 336 V-
FLAG 240 240 0
FLAG 576 144 V+
FLAG 576 224 V-
FLAG 16 144 V+
FLAG 16 208 V-
FLAG -48 240 0
FLAG 784 416 0
FLAG 224 416 0
FLAG 752 192 out
FLAG 464 176 ramp
SYMBOL Opamps\\LT1001 304 112 R0
SYMATTR InstName U1
SYMBOL voltage -48 336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value -15
SYMBOL voltage 80 336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 15
SYMBOL cap 336 16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 39 60 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 0.47µ
SYMATTR SpiceLine IC=3
SYMBOL res 240 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL Opamps\\LT1001 576 128 R0
SYMATTR InstName U3
SYMBOL res 640 304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL Opamps\\LT1001 16 112 R0
SYMATTR InstName U2
SYMBOL diode 48 48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode -16 -16 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res -160 112 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL zener 448 400 R90
WINDOW 0 -4 32 VBottom 2
WINDOW 3 36 32 VTop 2
SYMATTR InstName D3
SYMATTR Value BZX84C6V2L
SYMBOL zener 624 400 R90
WINDOW 0 -4 32 VBottom 2
WINDOW 3 36 32 VTop 2
SYMATTR InstName D4
SYMATTR Value BZX84C6V2L
SYMBOL diode 688 432 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D5
SYMATTR Value 1N4148
SYMBOL diode 256 432 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D6
SYMATTR Value 1N4148
TEXT -144 -160 Left 2 !.tran 0.5
CIRCLE Normal 384 128 208 -48 2