Version 4 SHEET 1 1124 680 WIRE 864 -16 640 -16 WIRE 640 64 640 -16 WIRE 640 64 416 64 WIRE 688 64 640 64 WIRE 256 96 48 96 WIRE 48 112 48 96 WIRE 256 112 256 96 WIRE 864 112 864 -16 WIRE 864 112 848 112 WIRE 688 160 656 160 WIRE -224 176 -224 160 WIRE -224 176 -256 176 WIRE -224 192 -224 176 WIRE 336 192 256 192 WIRE 336 224 336 192 WIRE 416 240 416 64 WIRE 336 320 336 304 WIRE 416 320 416 304 WIRE 416 320 336 320 WIRE 336 336 336 320 WIRE 496 416 336 416 WIRE 656 416 656 160 WIRE 656 416 496 416 FLAG -224 80 v+ FLAG 768 48 v+ FLAG -224 272 v- FLAG 768 176 v- FLAG -256 176 0 FLAG 256 256 0 FLAG 496 352 0 FLAG 48 192 0 SYMBOL voltage -224 64 R0 SYMATTR InstName V1 SYMATTR Value 4.5 SYMBOL voltage -224 176 R0 SYMATTR InstName V2 SYMATTR Value 4.5 SYMBOL tl072/tl07x 752 112 R0 SYMATTR InstName U2 SYMBOL res 240 96 R0 SYMATTR InstName R3 SYMATTR Value 11k SYMBOL res 320 208 R0 SYMATTR InstName R4 SYMATTR Value 150k SYMBOL res 320 320 R0 SYMATTR InstName R5 SYMATTR Value 47k SYMBOL cap 240 192 R0 SYMATTR InstName C3 SYMATTR Value 2.2n SYMBOL cap 480 352 R0 SYMATTR InstName C4 SYMATTR Value 100p SYMBOL cap 400 240 R0 SYMATTR InstName C5 SYMATTR Value 680p SYMBOL voltage 48 96 R0 SYMATTR InstName V3 SYMATTR Value SINE(0 .5 1k) SYMATTR Value2 AC 1 TEXT -104 352 Left 2 !.ac dec 20 20k 20\n# .tran 10m