Version 4 SHEET 1 2576 884 WIRE -528 16 -608 16 WIRE -432 16 -448 16 WIRE -400 16 -432 16 WIRE -544 96 -544 80 WIRE -880 112 -976 112 WIRE -752 112 -800 112 WIRE -608 112 -608 16 WIRE -608 112 -688 112 WIRE -576 112 -608 112 WIRE -432 128 -432 16 WIRE -432 128 -512 128 WIRE -576 144 -624 144 WIRE -976 160 -976 112 WIRE -544 176 -544 160 WIRE -800 256 -800 240 WIRE -976 272 -976 240 WIRE -800 368 -800 336 WIRE -800 368 -896 368 WIRE -752 368 -800 368 WIRE -624 368 -624 144 WIRE -624 368 -672 368 WIRE -896 432 -896 368 WIRE -800 432 -800 368 WIRE -624 448 -624 432 WIRE -896 560 -896 496 WIRE -800 560 -800 512 WIRE -624 560 -624 528 FLAG -400 16 out FLAG -624 560 0 FLAG -624 432 vcc FLAG -544 176 0 FLAG -544 80 vcc FLAG -800 560 0 FLAG -976 272 0 FLAG -800 240 vcc FLAG -896 560 0 SYMBOL res -544 32 R270 WINDOW 0 17 5 VTop 0 WINDOW 3 43 112 VBottom 0 SYMATTR InstName R3 SYMATTR Value 1MEG SYMBOL voltage -624 432 R0 SYMATTR InstName V1 SYMATTR Value 30 SYMBOL res -896 128 R270 WINDOW 0 17 7 VTop 0 WINDOW 3 43 108 VBottom 0 SYMATTR InstName R1 SYMATTR Value 100k SYMBOL res -768 384 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R2 SYMATTR Value 1MEG SYMBOL voltage -976 144 R0 WINDOW 3 48 31 VRight 0 WINDOW 123 9 2 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 -13 60 Left 0 SYMATTR Value PULSE(0 1 0 0.1u 0.1u 50u 100u) SYMATTR Value2 AC 1 SYMATTR InstName V3 SYMBOL cap -752 128 R270 WINDOW 0 17 9 VTop 0 WINDOW 3 43 62 VBottom 0 SYMATTR InstName C1 SYMATTR Value 0.1µ SYMBOL res -816 240 R0 SYMATTR InstName R5 SYMATTR Value 33k SYMBOL res -816 416 R0 SYMATTR InstName R6 SYMATTR Value 33k SYMBOL cap -912 432 R0 SYMATTR InstName C56 SYMATTR Value 10µ SYMBOL OpAmp.Add\\LM3900 -544 64 R0 WINDOW 0 -20 62 Left 0 WINDOW 38 62 33 Center 0 SYMATTR InstName U1 TEXT -976 24 Left 0 !.op TEXT -600 408 Left 0 ;.AC DEC 100 100 10MEG TEXT -808 24 Left 0 !.tran 0 20m 0 10u TEXT -616 216 Left 0 ;Amplifier with NORTON type opamp\nHelmut Sennewald 8/6/2004\nReference: AN-72.pdf from\nNational Semiconductor \nGain: \nAv = R3 / (R1 + rd) rd = 0.026/I2 TEXT -736 272 Left 0 ;I2 LINE Normal -688 304 -736 304 LINE Normal -704 288 -688 304 LINE Normal -704 320 -688 304