Version 4
SHEET 1 1296 680
WIRE 544 -128 448 -128
WIRE 656 -128 624 -128
WIRE 704 -128 656 -128
WIRE 816 -128 784 -128
WIRE 240 -64 -48 -64
WIRE 688 -64 240 -64
WIRE -48 -48 -48 -64
WIRE 448 16 448 -128
WIRE 240 32 240 16
WIRE 416 32 240 32
WIRE 688 48 688 -64
WIRE 688 48 480 48
WIRE -48 64 -48 16
WIRE 416 64 112 64
WIRE 240 80 240 32
WIRE 688 96 688 48
WIRE -48 160 -48 144
WIRE 112 160 112 64
WIRE 112 160 -48 160
WIRE -48 176 -48 160
WIRE -48 176 -128 176
WIRE 448 176 448 80
WIRE 816 176 816 -128
WIRE 816 176 448 176
WIRE 240 208 240 160
WIRE 384 240 288 240
WIRE 496 240 384 240
WIRE 592 240 496 240
WIRE 688 240 688 160
WIRE 688 240 656 240
FLAG -128 240 0
FLAG -48 256 0
FLAG 240 304 0
FLAG 384 304 0
FLAG 496 320 0
FLAG 688 320 0
FLAG 656 -128 0
SYMBOL res -64 48 R0
SYMATTR InstName R1
SYMATTR Value 50k
SYMBOL res -64 160 R0
SYMATTR InstName R2
SYMATTR Value 50k
SYMBOL cap -64 -48 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL cap -144 176 R0
SYMATTR InstName C2
SYMATTR Value 1n
SYMBOL res 224 -80 R0
SYMATTR InstName R3
SYMATTR Value 33k
SYMBOL res 224 64 R0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL njf 288 304 R180
SYMATTR InstName J1
SYMATTR Value 2N3819
SYMBOL cap 368 240 R0
SYMATTR InstName C3
SYMATTR Value 10n
SYMBOL res 480 224 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL diode 592 256 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res 672 224 R0
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL cap 672 96 R0
SYMATTR InstName C4
SYMATTR Value 10n
SYMBOL voltage 528 -128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage 688 -128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL Opamps\\LT1055 448 -16 R0
SYMATTR InstName U2
TEXT -152 344 Left 2 !.tran 20m