Version 4
SHEET 1 1224 680
WIRE 352 -288 336 -288
WIRE 368 -288 352 -288
WIRE 1120 -288 448 -288
WIRE 752 -112 752 -128
WIRE 752 -96 752 -112
WIRE 752 0 752 -16
WIRE 752 16 752 0
WIRE 1024 16 1024 -32
WIRE 576 64 512 64
WIRE 688 64 656 64
WIRE 960 64 832 64
WIRE 48 80 48 32
WIRE 352 160 352 -288
WIRE 368 160 352 160
WIRE 48 176 48 160
WIRE 48 176 -32 176
WIRE 512 176 512 64
WIRE 512 176 432 176
WIRE 576 176 512 176
WIRE 752 176 752 112
WIRE 752 176 656 176
WIRE 832 176 832 64
WIRE 832 176 752 176
WIRE 864 176 832 176
WIRE 1024 176 1024 112
WIRE 1024 176 944 176
WIRE 1120 176 1120 -288
WIRE 1120 176 1024 176
WIRE 1168 176 1120 176
WIRE 48 192 48 176
WIRE 288 192 288 144
WIRE 368 192 288 192
WIRE 288 224 288 192
WIRE 752 240 752 176
WIRE 1024 240 1024 176
WIRE 1168 256 1168 176
WIRE 512 288 512 176
WIRE 576 288 512 288
WIRE 688 288 656 288
WIRE 832 288 832 176
WIRE 960 288 832 288
WIRE 48 320 48 272
WIRE 288 336 288 304
WIRE 1024 384 1024 336
WIRE 752 400 752 336
WIRE 1168 400 1168 336
WIRE 752 528 752 480
FLAG -32 176 0
FLAG 48 32 +15
IOPIN 48 32 Out
FLAG 48 320 -15
IOPIN 48 320 Out
FLAG 288 336 0
FLAG 400 208 -15
IOPIN 400 208 In
FLAG 400 144 +15
IOPIN 400 144 In
FLAG 752 528 -15
IOPIN 752 528 In
FLAG 752 -128 +15
IOPIN 752 -128 In
FLAG 1024 384 -15
IOPIN 1024 384 In
FLAG 1024 -32 +15
IOPIN 1024 -32 In
FLAG 1168 400 0
FLAG 256 -288 0
FLAG 288 144 Signal
IOPIN 288 144 BiDir
FLAG 752 -112 OsziTastkopf
IOPIN 752 -112 BiDir
FLAG 752 0 OsziMasse
IOPIN 752 0 BiDir
SYMBOL voltage 48 64 R0
SYMATTR InstName V1
SYMBOL voltage 48 176 R0
SYMATTR InstName V2
SYMBOL Opamps\\TL072 400 112 R0
SYMATTR InstName U1
SYMBOL voltage 288 208 R0
SYMATTR InstName V3
SYMBOL res 560 192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 848 192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res 560 80 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 560 304 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL npn 688 16 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL pnp 688 336 M180
SYMATTR InstName Q2
SYMATTR Value BC557B
SYMBOL npn 960 16 R0
SYMATTR InstName Q3
SYMATTR Value BC547B
SYMBOL pnp 960 336 M180
SYMATTR InstName Q4
SYMATTR Value BC557B
SYMBOL res 1152 240 R0
SYMATTR InstName R5
SYMATTR Value 4
SYMBOL res 352 -304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 100k
SYMBOL res 464 -304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 400k
SYMBOL res 736 -112 R0
SYMATTR InstName R8
SYMATTR Value 37
SYMBOL res 736 384 R0
SYMATTR InstName R9
SYMATTR Value 37
TEXT -52 624 Left 2 !.tran 1