Version 4
SHEET 1 880 680
WIRE 608 -16 32 -16
WIRE -112 32 -144 32
WIRE 0 32 -32 32
WIRE 112 32 0 32
WIRE 128 32 112 32
WIRE 144 32 128 32
WIRE 240 32 224 32
WIRE 256 32 240 32
WIRE 288 32 256 32
WIRE 384 32 368 32
WIRE 400 32 384 32
WIRE 464 32 400 32
WIRE 496 32 464 32
WIRE 592 32 576 32
WIRE 608 32 608 -16
WIRE 608 32 592 32
WIRE 256 64 256 32
WIRE 400 64 400 32
WIRE 464 64 464 32
WIRE 608 64 608 32
WIRE 32 80 32 -16
WIRE 48 80 32 80
WIRE -144 112 -144 32
WIRE 0 112 0 32
WIRE 112 160 112 128
WIRE 256 160 256 128
WIRE 400 160 400 144
WIRE 464 160 464 128
WIRE 608 160 608 128
WIRE 400 176 400 160
WIRE 0 224 0 192
WIRE 0 224 -80 224
WIRE 336 224 0 224
WIRE -80 256 -80 224
WIRE 0 256 0 224
WIRE -144 368 -144 192
WIRE -80 368 -80 320
WIRE 0 368 0 336
WIRE 400 368 400 272
FLAG 256 160 0
FLAG 464 160 0
FLAG 608 160 0
FLAG 112 160 0
FLAG -144 368 0
FLAG 0 368 0
FLAG -80 368 0
FLAG 400 368 0
FLAG 128 32 A
FLAG 240 32 B
FLAG 384 32 C
FLAG 592 32 D
FLAG 400 160 E
SYMBOL npn 48 32 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL npn 336 176 R0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL res 240 16 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap 240 64 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL res 384 16 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL cap 448 64 R0
SYMATTR InstName C2
SYMATTR Value 1n
SYMBOL res 592 16 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL cap 592 64 R0
SYMATTR InstName C3
SYMATTR Value 1n
SYMBOL res -16 16 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 2k7
SYMBOL voltage -144 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 8
SYMBOL res -16 96 R0
SYMATTR InstName R5
SYMATTR Value 10k6
SYMBOL res -16 240 R0
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL cap -96 256 R0
SYMATTR InstName C4
SYMATTR Value 1n8
SYMBOL res 384 48 R0
SYMATTR InstName R7
SYMATTR Value 12k
TEXT 110 290 Left 0 !.tran 0 1m 0 0.1u