Version 4
SHEET 1 880 680
WIRE 32 -160 -144 -160
WIRE 128 -160 32 -160
WIRE 224 -160 128 -160
WIRE 336 -160 224 -160
WIRE 336 -144 336 -160
WIRE -144 -128 -144 -160
WIRE 32 -96 32 -160
WIRE 336 -48 336 -64
WIRE 336 -48 96 -48
WIRE 336 -16 336 -48
WIRE 480 16 -64 16
WIRE 224 32 224 -160
WIRE 336 48 336 -16
WIRE 32 80 32 0
WIRE 160 80 112 80
WIRE 32 112 32 80
WIRE -64 128 -64 16
WIRE 0 128 -64 128
WIRE 112 144 112 80
WIRE 112 144 64 144
WIRE 224 144 224 128
WIRE 336 144 336 112
WIRE 336 144 224 144
WIRE 480 144 480 16
WIRE 480 144 336 144
WIRE 512 144 480 144
WIRE 0 160 -208 160
WIRE 224 160 224 144
WIRE 336 176 336 144
WIRE 32 208 32 176
WIRE 112 208 112 144
WIRE 160 208 112 208
WIRE 32 224 32 208
WIRE 336 272 336 240
WIRE 336 272 96 272
WIRE -208 288 -208 160
WIRE 336 288 336 272
WIRE 32 384 32 320
WIRE 224 384 224 256
WIRE 224 384 32 384
WIRE 336 384 336 368
WIRE 336 384 224 384
WIRE 336 400 336 384
FLAG 512 144 out
IOPIN 512 144 Out
FLAG -208 368 0
FLAG -144 -48 0
FLAG -208 160 in
FLAG 336 400 0
FLAG 32 80 VCC
FLAG 32 208 VEE
FLAG 128 -160 VPOWER
FLAG 336 -16 KD1
FLAG 336 272 KD2
FLAG 112 80 OPAout
SYMBOL zener 320 112 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value BZX84C15L
SYMBOL zener 320 240 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value BZX84C15L
SYMBOL npn 96 -96 M0
SYMATTR InstName Q3
SYMATTR Value 2N5550
SYMBOL res 320 -160 R0
SYMATTR InstName R1
SYMATTR Value 33k
SYMBOL npn 160 32 R0
SYMATTR InstName Q1
SYMATTR Value 2N5550
SYMBOL pnp 160 256 M180
WINDOW 0 60 28 Left 2
WINDOW 3 59 65 Left 2
SYMATTR InstName Q2
SYMATTR Value 2N5401
SYMBOL pnp 96 320 R180
WINDOW 0 63 33 Left 2
WINDOW 3 63 66 Left 2
SYMATTR InstName Q4
SYMATTR Value 2N5401
SYMBOL Opamps\\UniversalOpamp2 32 144 R0
SYMATTR InstName U1
SYMBOL res 320 272 R0
SYMATTR InstName R2
SYMATTR Value 33k
SYMBOL voltage -144 -144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 100V
SYMBOL voltage -208 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(50V 50V 1Hz)
TEXT -186 402 Left 2 !.dc V2 0V 100V 10mV