Version 4
SHEET 1 1000 680
WIRE -208 -96 -304 -96
WIRE 80 -96 -208 -96
WIRE 240 -96 80 -96
WIRE 368 -96 240 -96
WIRE 80 -80 80 -96
WIRE -208 -64 -208 -96
WIRE 240 -32 240 -96
WIRE 80 16 80 0
WIRE 176 16 80 16
WIRE -208 32 -208 0
WIRE 368 32 368 -96
WIRE 80 48 80 16
WIRE 240 80 240 64
WIRE 304 80 240 80
WIRE -304 160 -304 -96
WIRE -208 176 -208 96
WIRE 240 192 240 80
WIRE 80 224 80 128
WIRE 80 224 -16 224
WIRE -208 272 -208 256
WIRE -192 272 -208 272
WIRE -96 272 -112 272
WIRE -80 272 -96 272
WIRE 336 272 240 272
WIRE -208 288 -208 272
WIRE 240 288 240 272
WIRE 368 288 368 128
WIRE -304 400 -304 240
WIRE -208 400 -208 368
WIRE -208 400 -304 400
WIRE -16 400 -16 320
WIRE -16 400 -208 400
WIRE 240 400 240 368
WIRE 240 400 -16 400
WIRE 368 400 368 368
WIRE 368 400 240 400
WIRE -304 416 -304 400
WIRE -96 464 -96 272
WIRE -32 464 -96 464
WIRE 336 464 336 272
WIRE 336 464 48 464
FLAG -304 416 0
SYMBOL npn -80 224 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL res 64 32 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL voltage -304 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 0 -36 6 Left 2
WINDOW 3 12 -18 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0.9 1.6 0 5 5 0 10 10)
SYMBOL pnp 176 64 M180
SYMATTR InstName Q2
SYMATTR Value BC557C
SYMBOL res -224 272 R0
WINDOW 0 -48 79 Left 2
WINDOW 3 36 80 Left 2
SYMATTR InstName R5
SYMATTR Value 800k
SYMBOL res -224 160 R0
WINDOW 0 -34 21 Left 2
WINDOW 3 40 22 Left 2
SYMATTR InstName R3
SYMATTR Value 200k
SYMBOL res -48 480 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 3300k
SYMBOL res 224 272 R0
SYMATTR InstName R7
SYMATTR Value 300k
SYMBOL res 224 176 R0
SYMATTR InstName R8
SYMATTR Value 700k
SYMBOL res 64 -96 R0
SYMATTR InstName R9
SYMATTR Value 50k
SYMBOL res -208 288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R10
SYMATTR Value 1000k
SYMBOL diode -224 -64 R0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode -224 32 R0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL npn2 304 32 R0
SYMATTR InstName Q3
SYMATTR Value BC547C
SYMBOL res 352 272 R0
SYMATTR InstName R1
SYMATTR Value 30
TEXT -240 440 Left 2 !.tran 10