Version 4
SHEET 1 1048 680
WIRE 800 16 608 16
WIRE 960 32 864 32
WIRE 416 48 16 48
WIRE 528 48 496 48
WIRE 608 48 608 16
WIRE 608 48 528 48
WIRE 656 48 608 48
WIRE 800 48 736 48
WIRE 16 128 16 48
WIRE 16 128 -112 128
WIRE 64 128 16 128
WIRE 320 128 144 128
WIRE -112 144 -112 128
WIRE 800 160 608 160
WIRE 960 176 864 176
WIRE 416 192 16 192
WIRE 528 192 496 192
WIRE 608 192 608 160
WIRE 608 192 528 192
WIRE 656 192 608 192
WIRE 736 192 736 48
WIRE 800 192 736 192
WIRE -112 256 -112 224
WIRE 16 256 16 192
WIRE 16 256 -112 256
WIRE 64 256 16 256
WIRE 320 256 320 128
WIRE 320 256 144 256
WIRE 800 288 608 288
WIRE 960 304 864 304
WIRE 416 320 16 320
WIRE 528 320 496 320
WIRE 608 320 608 288
WIRE 608 320 528 320
WIRE 656 320 608 320
WIRE 736 320 736 192
WIRE 800 320 736 320
WIRE 16 384 16 320
WIRE 64 384 16 384
WIRE 320 384 320 256
WIRE 320 384 144 384
FLAG 528 272 0
FLAG 528 400 0
FLAG 528 128 0
FLAG -112 256 0
SYMBOL res 160 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 200m
SYMBOL res 160 240 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 200m
SYMBOL res 160 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 20m
SYMBOL voltage -112 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12V
SYMBOL res 512 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 4k7
SYMBOL res 512 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 4k7
SYMBOL res 512 304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 4k7
SYMBOL res 544 416 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 544 288 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R8
SYMATTR Value 10k
SYMBOL res 544 144 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R9
SYMATTR Value 10k
SYMBOL res 640 64 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R10
SYMATTR Value 4k7
SYMBOL res 640 208 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R11
SYMATTR Value 4k7
SYMBOL res 640 336 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R12
SYMATTR Value 4k7
SYMBOL Digital\\diffschmtbuf 800 -32 R0
WINDOW 3 8 44 Left 2
SYMATTR Value Vt=0.005 Vh=0.005
SYMATTR InstName A1
SYMBOL Digital\\diffschmtbuf 800 112 R0
WINDOW 3 8 44 Left 2
SYMATTR Value Vt=0.005 Vh=0.005
SYMATTR InstName A2
SYMBOL Digital\\diffschmtbuf 800 240 R0
WINDOW 3 8 44 Left 2
SYMATTR Value Vt=0.005 Vh=0.005
SYMATTR InstName A3
TEXT -144 432 Left 2 !.tran 20m