Version 4
SHEET 1 880 680
WIRE 144 -144 -976 -144
WIRE -704 -48 -1248 -48
WIRE -272 -48 -704 -48
WIRE 192 -48 -272 -48
WIRE 192 -16 192 -48
WIRE -704 0 -704 -48
WIRE -272 0 -272 -48
WIRE 144 80 144 -144
WIRE 192 80 192 64
WIRE 192 80 144 80
WIRE -704 96 -704 80
WIRE -592 96 -704 96
WIRE -272 96 -272 80
WIRE -128 96 -272 96
WIRE 192 96 192 80
WIRE -1248 112 -1248 -48
WIRE -704 112 -704 96
WIRE -272 112 -272 96
WIRE -128 144 -128 96
WIRE -48 144 -128 144
WIRE 64 144 32 144
WIRE 128 144 64 144
WIRE -976 160 -976 -144
WIRE -944 160 -976 160
WIRE -832 160 -864 160
WIRE -768 160 -832 160
WIRE -592 160 -592 96
WIRE -512 160 -592 160
WIRE -400 160 -432 160
WIRE -336 160 -400 160
WIRE 64 192 64 144
WIRE -832 208 -832 160
WIRE -400 208 -400 160
WIRE -1248 224 -1248 192
WIRE 192 224 192 192
WIRE -704 240 -704 208
WIRE -272 240 -272 208
WIRE 64 288 64 256
WIRE -832 304 -832 272
WIRE -400 304 -400 272
WIRE -1248 336 -1248 304
WIRE 0 0 0 0
FLAG 64 288 0
FLAG 192 224 0
FLAG -400 304 0
FLAG -272 240 0
FLAG -832 304 0
FLAG -704 240 0
FLAG -1248 336 0
SYMBOL npn 128 96 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL res 176 -32 R0
SYMATTR InstName R1
SYMATTR Value 2200
SYMBOL res -64 160 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 10000
SYMBOL cap 48 192 R0
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL npn -336 112 R0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL res -288 -16 R0
SYMATTR InstName R3
SYMATTR Value 2200
SYMBOL res -528 176 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 10000
SYMBOL cap -416 208 R0
SYMATTR InstName C2
SYMATTR Value 1µ
SYMBOL npn -768 112 R0
SYMATTR InstName Q3
SYMATTR Value BC547C
SYMBOL res -720 -16 R0
SYMATTR InstName R5
SYMATTR Value 2200
SYMBOL res -960 176 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R6
SYMATTR Value 10000
SYMBOL cap -848 208 R0
SYMATTR InstName C3
SYMATTR Value 1µ
SYMBOL voltage -1248 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 9
SYMBOL res -1264 208 R0
SYMATTR InstName R7
SYMATTR Value 2200