Version 4 SHEET 1 912 680 WIRE 192 -16 144 -16 WIRE 304 -16 272 -16 WIRE 528 32 528 16 WIRE 192 64 176 64 WIRE 304 64 304 -16 WIRE 304 64 272 64 WIRE 336 64 304 64 WIRE 432 64 416 64 WIRE 176 80 176 64 WIRE 528 128 528 112 WIRE 304 160 304 64 WIRE 320 160 304 160 WIRE 432 176 432 64 WIRE 432 176 384 176 WIRE 480 176 432 176 WIRE 320 192 304 192 WIRE 352 224 352 208 WIRE 80 288 48 288 WIRE 192 288 80 288 WIRE 304 288 304 192 WIRE 304 288 272 288 WIRE 352 288 304 288 WIRE 480 288 432 288 WIRE 48 336 48 288 WIRE 304 368 304 288 WIRE 352 368 304 368 WIRE 480 368 480 288 WIRE 480 368 432 368 WIRE 480 384 480 368 WIRE 48 432 48 416 FLAG 352 224 0 FLAG 80 288 +IN FLAG 480 176 Out IOPIN 480 176 Out FLAG 528 128 0 FLAG 528 16 V+ FLAG 352 144 V+ FLAG 480 384 0 FLAG 176 80 0 FLAG 48 432 0 FLAG 144 -16 V+ SYMBOL Opamps\\LM324 352 112 R0 WINDOW 3 26 96 Left 2 SYMATTR InstName U2 SYMBOL res 288 48 R90 WINDOW 0 10 18 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 20k SYMBOL res 432 48 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 20k SYMBOL res 336 304 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R6 SYMATTR Value 20k SYMBOL res 288 272 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 20k SYMBOL battery 528 16 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 12V SYMBOL voltage 48 320 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 -38 52 Right 2 SYMATTR Value PULSE(0 4 5ms 90ms) SYMATTR InstName V3 SYMBOL res 448 352 R90 WINDOW 0 2 92 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value {R} SYMBOL res 288 -32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value {R} TEXT -16 464 Left 2 !.tran 100ms TEXT -56 160 Left 2 ;.param R=240k TEXT 144 448 Left 2 ;Offset = - (V+) * R6 / R1\n(For R1=R2) TEXT -56 128 Left 2 !.step param R list 120k 240k