Version 4
SHEET 1 1000 680
WIRE 240 96 112 96
WIRE 240 144 240 96
WIRE -496 160 -736 160
WIRE -400 160 -496 160
WIRE -208 160 -400 160
WIRE 208 160 -208 160
WIRE 368 176 272 176
WIRE 576 176 368 176
WIRE 704 176 656 176
WIRE 880 176 704 176
WIRE 144 192 -32 192
WIRE 208 192 144 192
WIRE 368 192 368 176
WIRE -32 224 -32 192
WIRE -736 256 -736 160
WIRE 704 256 704 176
WIRE -208 288 -208 160
WIRE -496 304 -496 160
WIRE -400 304 -400 160
WIRE 144 304 144 192
WIRE 368 304 368 272
WIRE 368 304 144 304
WIRE -736 336 -736 320
WIRE -32 336 -32 304
WIRE 112 336 112 96
WIRE 240 336 240 208
WIRE 368 336 368 304
WIRE -736 496 -736 416
WIRE -496 496 -496 368
WIRE -496 496 -736 496
WIRE -400 496 -400 368
WIRE -400 496 -496 496
WIRE -208 496 -208 368
WIRE -208 496 -400 496
WIRE -32 496 -32 416
WIRE -32 496 -208 496
WIRE 112 496 112 416
WIRE 112 496 -32 496
WIRE 176 496 112 496
WIRE 240 496 240 416
WIRE 240 496 176 496
WIRE 368 496 368 416
WIRE 368 496 240 496
WIRE 704 496 704 320
WIRE 704 496 368 496
WIRE 176 512 176 496
FLAG 176 512 0
FLAG 880 176 Vout
IOPIN 880 176 Out
SYMBOL Opamps\\LT1128 240 240 M180
SYMATTR InstName U1
SYMBOL res 352 176 R0
SYMATTR InstName R1
SYMATTR Value 2.5K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 352 320 R0
SYMATTR InstName R2
SYMATTR Value 1K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage 240 320 R0
WINDOW 0 33 36 Left 2
WINDOW 3 36 62 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage 112 320 R0
WINDOW 0 34 41 Left 2
WINDOW 3 36 65 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value -15
SYMBOL voltage -736 320 R0
WINDOW 0 41 45 Left 2
WINDOW 3 15 103 Left 2
WINDOW 123 40 126 Left 2
WINDOW 39 15 131 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 1 20k)
SYMBOL cap -752 256 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL res -224 272 R0
SYMATTR InstName R3
SYMATTR Value 10K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 672 160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 50
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL cap 688 256 R0
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL diode -512 304 R0
WINDOW 3 18 65 Left 2
SYMATTR Value 1N4148
SYMATTR InstName D1
SYMBOL diode -384 368 R180
WINDOW 0 -22 64 Left 2
WINDOW 3 -75 -3 Left 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL voltage -32 320 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value -1
SYMBOL res -48 208 R0
SYMATTR InstName R5
SYMATTR Value 1k
TEXT -760 144 Left 1 ;Piezo
TEXT -528 144 Left 1 ;Overvoltage-Protection
TEXT -240 144 Left 1 ;Highpass
TEXT 136 416 Left 1 ;OP Supply
TEXT 96 72 Left 1 ;Non-Inverting Amplifier
TEXT 616 120 Left 1 ;Lowpass
TEXT -184 -24 Left 4 ;Piezo Amplifier/Filter
TEXT 472 552 Left 2 !.tran 250u