Version 4
SHEET 1 2208 1200
WIRE -288 -176 -400 -176
WIRE -256 -96 -400 -96
WIRE -400 -80 -400 -96
WIRE -256 -64 -256 -96
WIRE -288 0 -400 0
WIRE -192 96 -240 96
WIRE -64 112 -128 112
WIRE 48 112 48 16
WIRE 48 112 0 112
WIRE 112 112 48 112
WIRE 256 112 112 112
WIRE 480 112 336 112
WIRE 880 112 480 112
WIRE -192 128 -352 128
WIRE 112 144 112 112
WIRE 880 160 880 112
WIRE -352 224 -352 208
WIRE -240 224 -240 96
WIRE 112 224 -240 224
WIRE 480 224 480 112
WIRE 512 224 480 224
WIRE 112 240 112 224
WIRE 832 240 832 224
WIRE 832 240 576 240
WIRE 352 256 288 256
WIRE 512 256 352 256
WIRE 288 320 288 256
WIRE 288 320 112 320
WIRE 880 320 880 256
WIRE 352 336 352 256
WIRE 352 416 16 416
WIRE 896 576 656 576
WIRE 1008 576 896 576
WIRE 336 592 176 592
WIRE 432 592 336 592
WIRE -192 624 -272 624
WIRE 1008 624 1008 576
WIRE -64 640 -128 640
WIRE 64 640 64 624
WIRE 64 640 0 640
WIRE 176 640 176 592
WIRE 176 640 64 640
WIRE -192 656 -560 656
WIRE 608 672 432 672
WIRE 656 672 656 576
WIRE 704 672 656 672
WIRE -560 688 -560 656
WIRE -160 688 -160 672
WIRE 960 688 768 688
WIRE 432 704 432 672
WIRE 608 704 608 672
WIRE 704 704 608 704
WIRE 1808 720 1008 720
WIRE 736 736 736 720
WIRE 896 752 896 576
WIRE 1808 768 1808 720
WIRE -272 784 -272 624
WIRE 16 784 16 416
WIRE 16 784 -272 784
WIRE 80 784 16 784
WIRE 256 784 160 784
WIRE 432 784 256 784
WIRE 1520 816 1120 816
WIRE 1520 880 1520 816
WIRE 336 928 336 592
WIRE 896 928 896 832
WIRE 896 928 336 928
WIRE 976 928 896 928
WIRE 1120 928 1120 816
WIRE 1120 928 1056 928
WIRE 1184 928 1120 928
WIRE 1472 944 1248 944
WIRE 256 960 256 784
WIRE 1184 960 256 960
WIRE 1216 992 1216 976
WIRE 1520 1040 1520 976
FLAG -288 -176 +15
FLAG -288 0 -15
FLAG -160 144 -15
FLAG 544 272 -15
FLAG -160 688 -15
FLAG -160 80 +15
FLAG 544 208 +15
FLAG -160 608 +15
FLAG -256 -64 0
FLAG -352 224 0
FLAG 736 736 -15
FLAG 736 656 +15
FLAG 1216 992 -15
FLAG 1216 912 +15
FLAG -560 688 0
FLAG 880 320 0
FLAG 1520 1040 0
FLAG 1808 768 0
FLAG 64 544 -15
FLAG 48 -64 +15
DATAFLAG 736 240 ""
DATAFLAG 880 688 ""
DATAFLAG 1392 944 ""
DATAFLAG 480 112 ""
DATAFLAG 352 256 ""
DATAFLAG -32 224 ""
DATAFLAG 112 112 ""
DATAFLAG 256 416 ""
DATAFLAG 416 592 ""
DATAFLAG 560 672 ""
DATAFLAG 224 784 ""
DATAFLAG -80 784 ""
DATAFLAG 1456 816 ""
DATAFLAG 832 576 ""
SYMBOL Opamps\\OP27 -160 48 R0
SYMATTR InstName U801
SYMBOL Opamps\\OP27 -160 576 R0
SYMATTR InstName U802
SYMBOL zener -64 128 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value PTZ6_2B
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL zener 0 624 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D2
SYMATTR Value PTZ6_2B
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL voltage -352 112 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 7
SYMBOL res 96 128 R0
WINDOW 3 36 61 Left 2
SYMATTR InstName R827+R825
SYMATTR Value 5.0825K
SYMBOL res 128 336 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R827-2
SYMATTR Value 5K
SYMBOL res 32 -80 R0
SYMATTR InstName R809
SYMATTR Value 1K
SYMBOL voltage -400 -96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 15
SYMBOL voltage -400 -192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value 15
SYMBOL res 336 320 R0
SYMATTR InstName R827-3/4
SYMATTR Value 2.5K
SYMBOL res 176 768 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R827-5/6
SYMATTR Value 2.5K
SYMBOL res 416 576 R0
SYMATTR InstName R827-8
SYMATTR Value 5K
SYMBOL res 416 688 R0
SYMATTR InstName R827-7
SYMATTR Value 5K
SYMBOL res 1072 912 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R826-8
SYMATTR Value 20K
SYMBOL res 48 528 R0
SYMATTR InstName R810
SYMATTR Value 1K
SYMBOL res 352 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R826-1
SYMATTR Value 20K
SYMBOL pjf 832 160 R0
SYMATTR InstName Q805
SYMATTR Value 2N5460
SYMBOL njf 1472 880 R0
SYMATTR InstName Q806
SYMATTR Value 2N5484
SYMBOL njf 960 624 R0
SYMATTR InstName Q807
SYMATTR Value 2N5484
SYMBOL res 880 736 R0
SYMATTR InstName R816
SYMATTR Value 1200K
SYMBOL Opamps\\AD712 736 624 R0
SYMATTR InstName U815
SYMBOL Opamps\\OP07 544 176 R0
SYMATTR InstName U816
SYMBOL Opamps\\OP07 1216 880 R0
SYMATTR InstName U817
TEXT -770 340 Left 2 !.tran 10
TEXT 1160 800 Left 2 ;CURRENT SOURCE
TEXT 576 96 Left 2 ;CURRENT SOURCE
TEXT 896 296 Left 2 ;GOES TO INTEGRATOR SWITCH...
TEXT 1544 1016 Left 2 ;GOES TO INTEGRATOR SWITCH...
TEXT 1816 736 Left 2 ;GOES TO INTEGRATOR DIRECTLY
TEXT 1544 984 Left 2 ;~450uA
TEXT 904 264 Left 2 ;~-450uA