Version 4
SHEET 1 1300 680
WIRE 624 -256 608 -256
WIRE 608 -224 608 -256
WIRE -112 -160 -128 -160
WIRE 0 -160 -16 -160
WIRE -128 -144 -128 -160
WIRE 320 -144 304 -144
WIRE -16 -128 -16 -160
WIRE 304 -128 304 -144
WIRE 336 -128 304 -128
WIRE 608 -128 608 -160
WIRE 608 -128 528 -128
WIRE 608 -96 608 -128
WIRE 704 -64 672 -64
WIRE 816 -64 784 -64
WIRE -128 -32 -128 -64
WIRE -128 -32 -160 -32
WIRE -16 -32 -16 -64
WIRE 80 -32 -16 -32
WIRE 336 -32 272 -32
WIRE 560 -32 528 -32
WIRE -160 -16 -160 -32
WIRE 608 -16 608 -32
WIRE -128 0 -128 -32
WIRE -16 0 -16 -32
WIRE 672 16 672 -64
WIRE 704 16 672 16
WIRE 816 16 816 -64
WIRE 816 16 768 16
WIRE 80 64 48 64
WIRE 304 64 272 64
WIRE -16 80 -16 64
WIRE -128 112 -128 80
WIRE -128 112 -144 112
WIRE 560 128 560 -32
WIRE 672 128 672 16
WIRE 672 128 560 128
WIRE 704 128 672 128
WIRE 304 144 304 64
WIRE 560 144 560 128
WIRE 816 144 816 16
WIRE 816 144 768 144
WIRE 848 144 816 144
WIRE 704 160 688 160
WIRE -64 176 -160 176
WIRE 48 176 48 64
WIRE 48 176 16 176
WIRE 80 176 48 176
WIRE 128 176 80 176
WIRE 224 192 192 192
WIRE 240 192 224 192
WIRE -160 208 -160 176
WIRE 128 208 112 208
WIRE 560 240 560 224
WIRE 560 240 544 240
WIRE 304 272 304 240
WIRE -160 304 -160 288
WIRE 80 304 80 176
WIRE 128 304 80 304
WIRE 224 304 224 192
WIRE 224 304 192 304
WIRE 80 336 80 304
WIRE 304 368 304 352
WIRE 80 432 80 416
WIRE 80 432 64 432
FLAG -16 80 0
FLAG -16 -160 VCC
FLAG -160 304 0
FLAG 112 208 0
FLAG 80 432 VEE
FLAG 304 368 0
FLAG -128 112 VEE
FLAG -160 -16 0
FLAG -128 -160 VCC
FLAG 608 -16 0
FLAG 608 -256 VCC
FLAG 688 160 0
FLAG 304 -144 VCC
FLAG -160 176 in
FLAG 848 144 out
IOPIN 848 144 Out
FLAG 560 240 VEE
SYMBOL npn 240 144 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL zener -32 -64 M180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D1
SYMATTR Value BZX84C10L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -80 160 M90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 4.7k
SYMBOL voltage -128 -160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 15V
SYMBOL voltage -128 -16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 15V
SYMBOL voltage -160 192 R0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value SINE(0 10V 1kHz)
SYMATTR Value2 AC 1V
SYMBOL cap 192 288 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C2
SYMATTR Value 2200p
SYMBOL res 64 320 R0
SYMATTR InstName R2
SYMATTR Value 2.2k
SYMBOL res 288 256 R0
SYMATTR InstName R3
SYMATTR Value 3.3k
SYMBOL zener 592 -160 M180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D2
SYMATTR Value BZX84C10L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 768 0 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C4
SYMATTR Value 470p
SYMBOL res 688 -48 R270
WINDOW 0 27 56 VTop 0
WINDOW 3 5 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 4.7k
SYMBOL res 544 128 R0
SYMATTR InstName R5
SYMATTR Value 2.2k
SYMBOL cap -32 0 R0
SYMATTR InstName C1
SYMATTR Value 47u
SYMBOL cap 592 -96 R0
SYMATTR InstName C3
SYMATTR Value 47u
SYMBOL Opamps\\opamp 160 128 R0
SYMATTR InstName U1
SYMBOL Opamps\\opamp 736 80 R0
SYMATTR InstName U4
SYMBOL Optos\\PC817C 176 16 M0
SYMATTR InstName U2
SYMBOL Optos\\PC817C 432 -80 R0
SYMATTR InstName U3
TEXT 488 192 Left 0 ;VR1
TEXT 776 -88 Left 0 ;VR2
TEXT 752 -256 Left 0 ;Output Circuit
TEXT 432 328 Left 0 !.ac oct 100 10 1Meg
TEXT 432 368 Left 0 !.lib opamp.sub
RECTANGLE Normal 928 272 432 -304 2