Version 4
SHEET 1 880 680
WIRE -352 64 -352 32
WIRE -352 192 -352 144
WIRE -352 256 -352 192
WIRE -352 384 -352 320
WIRE -304 192 -352 192
WIRE -304 256 -304 192
WIRE -304 384 -352 384
WIRE -304 384 -304 336
WIRE -272 272 -272 224
WIRE -272 384 -304 384
WIRE -272 384 -272 272
WIRE -256 64 -256 48
WIRE -256 160 -256 144
WIRE -256 272 -272 272
WIRE -224 224 -272 224
WIRE -224 240 -224 224
WIRE -224 320 -224 304
WIRE -176 48 -256 48
WIRE -176 80 -176 48
WIRE -176 160 -256 160
WIRE -176 160 -176 144
WIRE -160 192 -304 192
WIRE -160 304 -160 192
WIRE -128 48 -176 48
WIRE -128 80 -128 48
WIRE -128 160 -176 160
WIRE -128 160 -128 144
WIRE -128 208 -128 160
WIRE -128 320 -144 320
WIRE -128 320 -128 272
WIRE -96 160 -128 160
WIRE -96 192 -160 192
WIRE -96 384 -272 384
WIRE -96 384 -96 224
WIRE -96 400 -96 384
WIRE -64 304 -160 304
WIRE 112 192 96 192
WIRE 144 48 -128 48
WIRE 144 192 112 192
WIRE 144 192 144 48
WIRE 144 208 144 192
WIRE 144 304 0 304
WIRE 144 304 144 288
WIRE 176 32 -352 32
WIRE 176 64 176 32
WIRE 176 384 -96 384
WIRE 176 384 176 128
WIRE 240 32 176 32
WIRE 240 160 96 160
WIRE 240 160 240 32
WIRE 240 240 240 160
WIRE 240 384 176 384
WIRE 240 384 240 320
FLAG -96 400 0
FLAG 112 192 Out
SYMBOL res -368 48 R0
WINDOW 0 49 67 VRight 0
WINDOW 3 49 4 VRight 0
SYMATTR InstName R1
SYMATTR Value 100K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage 240 224 R0
WINDOW 0 -31 9 Left 0
WINDOW 3 -12 58 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 -38 68 VRight 0
SYMATTR InstName V1
SYMATTR Value 15
SYMATTR SpiceLine Rser=.1
SYMBOL diode -112 144 R180
WINDOW 0 -20 61 Left 0
WINDOW 3 24 0 Invisible 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL diode -192 80 R0
WINDOW 0 21 3 Left 0
WINDOW 3 24 72 Invisible 0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL res -272 48 R0
WINDOW 0 44 73 VRight 0
WINDOW 3 47 3 VRight 0
SYMATTR InstName R3
SYMATTR Value 2K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL cap -144 208 R0
WINDOW 0 -14 2 Left 0
WINDOW 3 20 2 Left 0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL res -128 304 R90
WINDOW 0 65 81 VBottom 0
WINDOW 3 38 39 VTop 0
SYMATTR InstName R4
SYMATTR Value 680
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res -320 240 R0
WINDOW 0 36 96 VRight 0
WINDOW 3 33 -38 VRight 0
SYMATTR InstName R2
SYMATTR Value 100K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Pote -240 208 R0
WINDOW 0 -30 48 Left 0
WINDOW 123 8 2 Center 0
WINDOW 3 55 54 VCenter 0
SYMATTR InstName P1
SYMATTR Value2 Set=.25
SYMATTR Value Rt=500
SYMBOL res 128 192 R0
WINDOW 0 -8 79 VRight 0
WINDOW 3 -7 17 VRight 0
SYMATTR InstName R5
SYMATTR Value 56K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL cap 0 288 R90
WINDOW 0 14 58 VBottom 0
WINDOW 3 -12 -10 VTop 0
SYMATTR InstName C2
SYMATTR Value 47p
SYMBOL cap 160 64 R0
WINDOW 0 38 32 Left 0
WINDOW 3 21 65 Left 0
SYMATTR InstName C3
SYMATTR Value 100n
SYMBOL cap -368 256 R0
WINDOW 0 17 55 Left 0
WINDOW 3 20 2 Left 0
SYMATTR InstName C4
SYMATTR Value 25p
SYMBOL ca31X0 0 176 R0
WINDOW 38 -41 -93 Left 0
SYMATTR InstName U2
TEXT -68 402 Left 0 !.tran 0 600u 100u startup
TEXT -352 400 Left 0 !.four 100k V(Out)
TEXT -16 360 Left 0 !.option noopiter