Version 4
SHEET 1 1292 680
WIRE 656 -368 512 -368
WIRE 752 -368 656 -368
WIRE 992 -368 848 -368
WIRE 512 -320 512 -368
WIRE 656 -288 656 -368
WIRE -352 -176 -352 -224
WIRE -352 -176 -400 -176
WIRE 512 -160 512 -240
WIRE 656 -160 656 -208
WIRE 800 -160 800 -304
WIRE 800 -160 656 -160
WIRE -352 -144 -352 -176
WIRE 800 -128 800 -160
WIRE 992 -112 992 -368
WIRE -400 -16 -400 -176
WIRE -352 -16 -352 -64
WIRE 800 -16 800 -48
WIRE -416 32 -480 32
WIRE -240 32 -336 32
WIRE -96 32 -160 32
WIRE -32 32 -96 32
WIRE 192 32 48 32
WIRE 272 32 192 32
WIRE 432 32 352 32
WIRE 592 32 432 32
WIRE 736 32 592 32
WIRE -96 80 -96 32
WIRE 592 96 592 32
WIRE -480 128 -480 32
WIRE 192 128 192 32
WIRE 432 144 432 32
WIRE -96 192 -96 144
WIRE -16 192 -96 192
WIRE 144 192 64 192
WIRE 368 192 240 192
WIRE -96 256 -96 192
WIRE -480 304 -480 208
WIRE 432 320 432 240
WIRE 592 320 592 160
WIRE 800 320 800 80
WIRE 992 320 992 -48
FLAG -96 256 0
FLAG 432 320 0
FLAG -480 304 0
FLAG 800 320 0
FLAG 592 320 0
FLAG 992 320 0
FLAG -352 -224 0
FLAG 512 -160 0
SYMBOL npn 144 128 M90
SYMATTR InstName Q1
SYMATTR Value BC847C
SYMBOL npn 368 240 M180
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL res 64 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10
SYMBOL res 368 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10
SYMBOL res 80 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1meg
SYMBOL voltage -352 -48 R180
WINDOW 3 -158 473 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 0 -80 55 Left 2
SYMATTR Value PULSE(0 5 1u 10n 10n 1u 2u)
SYMATTR InstName V1
SYMBOL diode 608 160 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL cap 976 -112 R0
SYMATTR InstName C1
SYMATTR Value 1µ IC=0
SYMBOL voltage 512 -336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 48
SYMBOL sw -432 32 M90
SYMATTR InstName S1
SYMBOL voltage -480 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL cap -112 80 R0
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL res -144 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10
SYMBOL npn 736 -16 R0
SYMATTR InstName Q3
SYMBOL pnp 848 -304 M270
SYMATTR InstName Q4
SYMBOL res 640 -304 R0
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL res 784 -144 R0
SYMATTR InstName R7
SYMATTR Value 1k
TEXT -456 400 Left 2 !.tran 2u
TEXT -320 -376 Left 2 !.model SW VSWITCH(Roff=1e6 Ron=1m Voff=0 Von=2 vh=1)