Version 4
SHEET 1 2344 1936
WIRE 400 1152 48 1152
WIRE 576 1152 400 1152
WIRE 400 1168 400 1152
WIRE 576 1168 576 1152
WIRE 400 1264 400 1248
WIRE 448 1264 400 1264
WIRE 576 1264 576 1248
WIRE 48 1280 48 1232
WIRE 144 1280 112 1280
WIRE 256 1280 144 1280
WIRE 336 1280 320 1280
WIRE 400 1312 400 1264
WIRE -80 1360 -144 1360
WIRE -64 1360 -80 1360
WIRE -16 1360 -32 1360
WIRE 48 1360 48 1280
WIRE 48 1360 -16 1360
WIRE 240 1360 128 1360
WIRE 256 1360 240 1360
WIRE 336 1360 336 1280
WIRE -144 1392 -144 1360
WIRE 48 1392 48 1360
WIRE 144 1424 144 1280
WIRE 240 1424 240 1360
WIRE 400 1440 400 1408
WIRE -144 1520 -144 1472
WIRE 48 1520 48 1472
WIRE 144 1536 144 1504
WIRE 240 1536 240 1488
WIRE 240 1536 144 1536
WIRE 400 1536 400 1520
WIRE 400 1536 240 1536
FLAG -144 1520 0
FLAG -144 1360 IN
FLAG 48 1520 0
FLAG 448 1264 OUT
FLAG 576 1264 0
FLAG 400 1616 0
SYMBOL npn 336 1312 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL res 384 1424 R0
SYMATTR InstName R3
SYMATTR Value 470
SYMBOL voltage -144 1376 R0
WINDOW 123 24 105 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName V3
SYMATTR Value ""
SYMBOL res 32 1488 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL cap -16 1344 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 2,2µ
SYMBOL res 32 1248 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL voltage 576 1152 R0
SYMATTR InstName V1
SYMATTR Value 9
SYMBOL res 384 1152 R0
SYMATTR InstName R4
SYMATTR Value 47K
SYMBOL res 384 1520 R0
SYMATTR InstName R
SYMATTR Value 22k
SYMBOL res 352 1344 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 56k
SYMBOL res 144 1344 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 56k
SYMBOL cap 224 1424 R0
SYMATTR InstName C2
SYMATTR Value 300p
SYMBOL cap 48 1296 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C3
SYMATTR Value 300p
SYMBOL cap 256 1296 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C4
SYMATTR Value 300p
SYMBOL res 128 1408 R0
SYMATTR InstName R7
SYMATTR Value 8k
TEXT -160 1256 Left 2 !.ac dec 1000 10 20k