Version 4
SHEET 1 1136 680
WIRE 816 -48 -144 -48
WIRE 288 0 128 0
WIRE 416 0 288 0
WIRE 560 0 496 0
WIRE 128 80 128 0
WIRE 560 128 560 0
WIRE 656 128 560 128
WIRE 736 128 656 128
WIRE 560 160 560 128
WIRE 656 160 656 128
WIRE -144 176 -144 -48
WIRE 736 176 736 128
WIRE 128 192 128 144
WIRE 560 272 560 240
WIRE 656 272 656 240
WIRE 656 272 560 272
WIRE 736 272 736 240
WIRE 736 272 656 272
WIRE 816 272 816 -48
WIRE 816 272 736 272
WIRE -144 288 -144 256
WIRE 0 288 -144 288
WIRE 128 288 128 272
WIRE 128 288 0 288
WIRE 128 304 128 288
WIRE 560 304 560 272
WIRE 736 304 736 272
WIRE 128 432 128 384
WIRE 560 432 560 384
WIRE 736 432 736 368
WIRE 736 432 560 432
WIRE 560 464 560 432
WIRE 128 544 128 496
FLAG 128 544 0
FLAG 560 544 0
FLAG 0 288 out
IOPIN 0 288 Out
FLAG 288 80 0
SYMBOL cap 112 80 R0
SYMATTR InstName C1
SYMATTR Value .0027u
SYMBOL res 112 176 R0
SYMATTR InstName R1
SYMATTR Value {Rh}
SYMBOL res 112 288 R0
SYMATTR InstName R2
SYMATTR Value {50k-Rh}
SYMBOL cap 112 432 R0
SYMATTR InstName C2
SYMATTR Value .039u
SYMBOL voltage 288 -16 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 2
SYMATTR InstName V1
SYMATTR Value SINE(0 2 1k)
SYMBOL res 544 448 R0
SYMATTR InstName R4
SYMATTR Value 1.5k
SYMBOL res 544 288 R0
SYMATTR InstName R
SYMATTR Value {50k-Rh}
SYMBOL res 544 144 R0
WINDOW 0 -34 5 Left 2
WINDOW 3 -53 86 Left 2
SYMATTR InstName R6
SYMATTR Value {Rh}
SYMBOL cap 720 304 R0
SYMATTR InstName C3
SYMATTR Value .1u
SYMBOL cap 720 176 R0
WINDOW 0 5 -26 Left 2
SYMATTR InstName C4
SYMATTR Value .01u
SYMBOL res 512 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 6.8k
SYMBOL res -160 160 R0
SYMATTR InstName R9
SYMATTR Value 5.6k
SYMBOL res 640 144 R0
SYMATTR InstName R3
SYMATTR Value 82k
TEXT 264 664 Left 2 !.ac oct 10 10 100k
TEXT 272 616 Left 2 !.step param Rh LIST 0.1 1 1k 10k 20k 25k 30k 40k 43k 49k