Version 4
SHEET 1 1656 680
WIRE -128 -112 -224 -112
WIRE 496 -112 -128 -112
WIRE 1072 -112 496 -112
WIRE -128 -80 -128 -112
WIRE 784 -64 672 -64
WIRE 1184 -64 896 -64
WIRE 784 -16 784 -64
WIRE 672 16 672 -64
WIRE 1184 16 1184 -64
WIRE 320 32 32 32
WIRE 496 48 496 -112
WIRE 1072 48 1072 -112
WIRE 320 64 320 32
WIRE 896 64 896 -64
WIRE -224 80 -224 -112
WIRE 288 80 256 80
WIRE 864 80 832 80
WIRE 400 96 352 96
WIRE 432 96 400 96
WIRE 976 96 928 96
WIRE 1008 96 976 96
WIRE 160 112 128 112
WIRE 288 112 240 112
WIRE 784 112 784 64
WIRE 864 112 784 112
WIRE 32 160 32 32
WIRE 128 160 128 112
WIRE -128 176 -128 0
WIRE 256 176 256 80
WIRE 400 176 256 176
WIRE 496 176 496 144
WIRE 496 176 400 176
WIRE 528 176 496 176
WIRE 672 176 672 96
WIRE 832 176 832 80
WIRE 832 176 672 176
WIRE 976 176 832 176
WIRE 1072 176 1072 144
WIRE 1072 176 976 176
WIRE 1184 176 1184 96
WIRE 1184 176 1072 176
WIRE 1264 176 1184 176
WIRE 400 192 400 176
WIRE 496 192 496 176
WIRE 976 192 976 176
WIRE 1072 192 1072 176
WIRE 1184 192 1184 176
WIRE 784 208 784 112
WIRE 896 288 896 128
WIRE 1184 288 1184 272
WIRE 1184 288 896 288
WIRE -224 304 -224 144
WIRE -128 304 -128 256
WIRE -128 304 -224 304
WIRE 32 304 32 240
WIRE 128 304 128 240
WIRE 128 304 32 304
WIRE 320 304 320 128
WIRE 320 304 128 304
WIRE -128 336 -128 304
WIRE 320 336 320 304
WIRE 496 336 496 272
WIRE 784 336 784 288
WIRE 1072 336 1072 272
WIRE 400 384 400 272
WIRE 976 384 976 272
WIRE 688 464 448 464
WIRE 928 464 688 464
WIRE 688 496 688 464
WIRE 400 608 400 480
WIRE 688 608 688 576
WIRE 976 608 976 480
FLAG 320 336 0
FLAG 496 336 0
FLAG -128 336 0
FLAG 784 336 0
FLAG 1072 336 0
FLAG 976 608 0
FLAG 528 176 Out1
FLAG 1264 176 Out2
FLAG 400 608 0
FLAG 688 608 0
FLAG 976 96 B2
FLAG 400 96 B1
SYMBOL res 480 176 R0
SYMATTR InstName R1
SYMATTR Value 5
SYMBOL npn 432 48 R0
SYMATTR InstName Q1
SYMATTR Value ZTX1048A
SYMBOL Opamps\\LT1001 320 32 R0
SYMATTR InstName U1
SYMBOL voltage -128 -96 R0
WINDOW 3 40 74 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 47 44 Left 0
WINDOW 0 39 14 Left 0
SYMATTR Value PULSE(-3 +3 0 .1 .1 .1 .4 5)
SYMATTR SpiceLine Rser=.05
SYMATTR InstName V1
SYMBOL voltage -128 160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 132 Left 0
SYMATTR SpiceLine Rser=.01
SYMATTR InstName V2
SYMATTR Value 25
SYMBOL res 1056 176 R0
SYMATTR InstName R4
SYMATTR Value 5
SYMBOL npn 1008 48 R0
SYMATTR InstName Q2
SYMATTR Value ZTX1048A
SYMBOL Opamps\\LT1001 896 32 R0
SYMATTR InstName U2
SYMBOL res 768 192 R0
SYMATTR InstName R5
SYMATTR Value 4k
SYMBOL voltage 1184 0 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V5
SYMATTR Value 15
SYMBOL voltage 1184 176 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V6
SYMATTR Value 15
SYMBOL voltage 32 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 30
SYMBOL res 384 176 R0
SYMATTR InstName R7
SYMATTR Value 3
SYMBOL res 960 176 R0
SYMATTR InstName R8
SYMATTR Value 3
SYMBOL voltage 688 480 M0
WINDOW 3 -182 -46 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 10 0 1m 1m 10m 70m 10)
SYMATTR InstName V4
SYMBOL nmos 928 384 R0
SYMATTR InstName M1
SYMATTR Value FDS6699S
SYMBOL cap -240 80 R0
SYMATTR InstName C1
SYMATTR Value 100000µ
SYMBOL res 768 -32 R0
SYMATTR InstName R9
SYMATTR Value 4k
SYMBOL voltage 128 144 R0
WINDOW 0 42 49 Left 0
SYMATTR InstName Vref1
SYMATTR Value 15
SYMBOL voltage 672 0 R0
SYMATTR InstName Vref2
SYMATTR Value 15
SYMBOL res 144 128 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R2
SYMATTR Value 2k
SYMBOL nmos 448 384 M0
SYMATTR InstName M2
SYMATTR Value FDS6699S
TEXT 96 416 Left 0 !.tran 0 1 0