Version 4
SHEET 1 1252 1188
WIRE 96 -192 96 -208
WIRE 96 -192 32 -192
WIRE 128 -192 96 -192
WIRE 128 -176 128 -192
WIRE 32 -144 32 -192
WIRE 128 -96 128 -112
WIRE 128 -96 96 -96
WIRE 208 -96 128 -96
WIRE 208 -80 208 -96
WIRE 384 -32 368 -32
WIRE 416 -32 384 -32
WIRE 624 -32 496 -32
WIRE 656 -32 624 -32
WIRE 208 32 208 0
WIRE 624 64 624 -32
WIRE 624 64 608 64
WIRE 304 80 272 80
WIRE 384 80 384 -32
WIRE 544 80 384 80
WIRE 672 96 672 80
WIRE 672 96 608 96
WIRE 880 96 672 96
WIRE 992 96 992 64
WIRE 992 96 960 96
WIRE 672 160 672 96
WIRE 784 208 736 208
WIRE 880 208 864 208
WIRE 32 240 32 -48
WIRE 176 240 32 240
WIRE 176 272 176 240
WIRE 880 336 880 208
WIRE 880 336 832 336
WIRE 896 336 880 336
WIRE 992 336 992 96
WIRE 992 336 976 336
WIRE 672 352 672 240
WIRE 672 352 640 352
WIRE 736 352 736 208
WIRE 736 352 672 352
WIRE 768 352 736 352
WIRE 880 368 832 368
WIRE 880 384 880 368
WIRE 176 400 176 352
WIRE 176 400 112 400
WIRE 640 432 640 352
WIRE 112 480 112 400
WIRE 992 480 992 336
WIRE 992 480 960 480
WIRE 224 528 224 512
WIRE 224 528 176 528
WIRE 352 528 224 528
WIRE 640 544 640 512
WIRE 752 544 640 544
WIRE 960 544 960 480
WIRE 960 544 832 544
WIRE 640 560 640 544
WIRE 960 560 960 544
WIRE 112 640 112 576
WIRE 352 640 352 528
WIRE 592 640 592 624
WIRE 592 640 352 640
FLAG -96 -96 vcc
FLAG -96 -16 0
FLAG 576 48 vcc
FLAG 800 320 vcc
FLAG 880 384 0
FLAG 688 624 0
FLAG 960 624 0
FLAG 992 -16 vcc
FLAG 736 -32 0
FLAG 208 128 0
FLAG -112 -304 vh
FLAG -112 -224 0
FLAG 96 -208 vh
FLAG 112 640 0
FLAG 224 432 vh
FLAG -128 144 vee
FLAG -128 224 0
FLAG 800 448 vee
FLAG 576 176 vee
SYMBOL voltage -96 -112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL Opamps\\LT1013A 576 16 M0
SYMATTR InstName U1
SYMBOL Opamps\\LT1013A 800 288 M0
SYMATTR InstName U2
SYMBOL res 880 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 50k
SYMBOL res 992 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 50k
SYMBOL res 624 416 R0
SYMATTR InstName R3
SYMATTR Value 14k
SYMBOL npn 592 560 M90
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL zener 976 624 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value BZX84C6V2L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 848 528 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL res 976 -32 R0
SYMATTR InstName R5
SYMATTR Value 3k
SYMBOL res 976 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 17k
SYMBOL res 656 144 R0
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL res 752 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 10k
SYMBOL res 512 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 50k
SYMBOL res 400 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 5k
SYMBOL npn 272 32 M0
SYMATTR InstName Q2
SYMATTR Value 2N2222
SYMBOL res 192 -96 R0
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL res 160 256 R0
SYMATTR InstName R12
SYMATTR Value 1
SYMBOL pnp 96 -48 R180
SYMATTR InstName Q3
SYMATTR Value D45H11
SYMBOL voltage -112 -320 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 8
SYMBOL cap 112 -176 R0
SYMATTR InstName C1
SYMATTR Value 2.2µ
SYMBOL npn 176 480 M0
SYMATTR InstName Q4
SYMATTR Value 2N2222
SYMBOL res 208 416 R0
SYMATTR InstName R13
SYMATTR Value 4.7k
SYMBOL zener 816 448 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value BZX84C6V2L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL voltage -128 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value -15
SYMBOL zener 592 176 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D3
SYMATTR Value BZX84C6V2L
SYMATTR Description Diode
SYMATTR Type diode
TEXT -58 848 Left 2 !.tran 0 1 0