Version 4
SHEET 1 880 760
WIRE 304 144 304 128
WIRE 304 144 288 144
WIRE 320 144 304 144
WIRE 320 160 320 144
WIRE 288 256 288 144
WIRE 320 256 320 240
WIRE 112 288 16 288
WIRE 160 288 112 288
WIRE 272 288 240 288
WIRE 464 288 336 288
WIRE 512 288 464 288
WIRE 672 288 592 288
WIRE 736 288 672 288
WIRE 800 288 736 288
WIRE 16 320 16 288
WIRE 112 320 112 288
WIRE 672 336 672 288
WIRE 304 352 304 320
WIRE 736 352 736 288
WIRE 64 384 32 384
WIRE 672 448 672 416
WIRE 736 448 736 416
WIRE 736 448 672 448
WIRE 736 496 736 448
WIRE 32 512 32 384
WIRE 112 512 112 496
WIRE 112 512 32 512
WIRE 112 544 112 512
WIRE 672 608 672 592
WIRE 800 608 800 592
WIRE 672 720 672 688
WIRE 800 720 800 688
FLAG 800 720 0
FLAG 800 592 +V
FLAG 672 720 0
FLAG 672 592 -V
FLAG 304 128 +V
FLAG 304 352 -V
FLAG 736 496 0
FLAG 800 288 OUT
FLAG 464 288 X1
FLAG 112 544 -V
FLAG 16 320 0
SYMBOL voltage 800 592 R0
SYMATTR InstName V1
SYMATTR Value 18
SYMBOL voltage 672 592 R0
SYMATTR InstName V2
SYMATTR Value -18
SYMBOL opamps\\LT1010 304 224 R0
SYMATTR InstName U1
SYMBOL res 304 144 R0
SYMATTR InstName R1
SYMATTR Value 49.9
SYMBOL res 256 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res 496 304 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value 562
SYMBOL res 688 432 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R6
SYMATTR Value 25k
SYMBOL cap 720 352 R0
SYMATTR InstName C1
SYMATTR Value 100p
SYMBOL njf 64 320 R0
SYMATTR InstName J1
SYMATTR Value BF862
SYMBOL res 96 400 R0
SYMATTR InstName R7
SYMATTR Value 200
TEXT -456 616 Left 2 !.model bf862 njf(beta=47.800m rd=.8 rs=7.5 lambda=37.3m \n+ vto=-.57093 is=424.6p cgd=7.4p pb=.5 \n+ fc=.5 cgs=8.29p kf=87.5e-18 af=1 alpha=-1m nr=2 isr=2.995p \n+ vtotc=-2m betatce=-.5 xti=3 vk=59.97 m=.6015 MFG=PHILIPS
TEXT -458 744 Left 2 !.tran 0 50m 40m