Version 4
SHEET 1 880 680
WIRE 336 -96 0 -96
WIRE 432 -96 336 -96
WIRE 608 -96 432 -96
WIRE 0 -80 0 -96
WIRE 336 -80 336 -96
WIRE 432 -80 432 -96
WIRE 608 0 608 -96
WIRE 336 16 336 0
WIRE -272 64 -368 64
WIRE -144 64 -192 64
WIRE 0 64 0 0
WIRE 0 64 -80 64
WIRE 80 64 0 64
WIRE 432 64 432 0
WIRE 432 64 400 64
WIRE 512 64 432 64
WIRE -368 128 -368 64
WIRE 0 128 0 64
WIRE 336 128 336 112
WIRE 336 128 208 128
WIRE 704 128 336 128
WIRE 752 128 704 128
WIRE 80 176 80 64
WIRE 144 176 80 176
WIRE 336 176 336 128
WIRE 432 176 432 64
WIRE 512 176 512 64
WIRE 80 192 80 176
WIRE -368 288 -368 208
WIRE 0 288 0 208
WIRE 0 288 -368 288
WIRE 80 288 80 256
WIRE 80 288 0 288
WIRE 208 288 208 224
WIRE 208 288 80 288
WIRE 336 288 336 240
WIRE 336 288 208 288
WIRE 432 288 432 256
WIRE 432 288 336 288
WIRE 512 288 512 240
WIRE 512 288 432 288
WIRE 608 288 608 80
WIRE 608 288 512 288
WIRE -368 304 -368 288
FLAG -368 304 0
FLAG 704 128 AGC
SYMBOL cap 320 176 R0
SYMATTR InstName C2
SYMATTR Value 33µ
SYMBOL res 416 160 R0
SYMATTR InstName R6
SYMATTR Value 6.8k
SYMBOL res 320 -96 R0
SYMATTR InstName R4
SYMATTR Value 39k
SYMBOL res 416 -96 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL pnp 400 112 R180
WINDOW 0 86 83 Left 2
WINDOW 3 29 49 Left 2
SYMATTR InstName Q1
SYMATTR Value BC557C
SYMBOL voltage 608 -16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 8V
SYMBOL cap 496 176 R0
SYMATTR InstName C3
SYMATTR Value 100n
SYMBOL voltage -368 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 0 -74 78 Left 2
WINDOW 3 -76 115 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 450m 455k 1m 0 0 50k)
SYMBOL npn 144 128 R0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL cap -80 48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL res 16 112 M0
SYMATTR InstName R3
SYMATTR Value 56k
SYMBOL res 16 -96 M0
SYMATTR InstName R2
SYMATTR Value 1Meg
SYMBOL schottky 64 256 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value BAT43
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -176 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 470
TEXT -368 -96 Left 2 !.tran 0 2 0 200n