* SPICE netlist
Q1 N001 N003 0 0 2N3904
Q2 2+ N002 0 0 2N3904
Q3 N004 N005 0 0 2N3904
R1 Vp N001 1k
R2 Vp 2+ 1k
R3 N002 N001 47k
R4 2+ N003 47k
R5 N004 N007 200k
R6 W2 N006 200k
R7 Vp N004 1k
R8 N005 W2 100k
C1 N006 W1 100p
C2 N007 W1 100p
C3 N002 N001 39p
C4 2+ N003 39p
D1 N003 N006 1N914
D2 N002 N007 1N914
V1 Vp 0 5
V2 W1 0 PULSE(0 5 0 1n 1n 0.05m 0.1m)
V3 W2 0 PWL REPEAT FOREVER (0 5 0.075m 5 0.075000001m 0 0.175m 0 0.175000001m 5 0.2m 5) ENDREPEAT
.tran 1m

* LTspice schematic (.asc)
Version 4
SHEET 1 1488 704
WIRE 216 -352 -40 -352
WIRE 632 -352 216 -352
WIRE 744 -352 632 -352
WIRE 216 -304 216 -352
WIRE 632 -304 632 -352
WIRE -744 -288 -744 -320
WIRE -632 -288 -632 -320
WIRE -520 -288 -520 -320
WIRE -40 -256 -40 -352
WIRE 216 -192 216 -224
WIRE 296 -192 216 -192
WIRE 376 -192 360 -192
WIRE 488 -192 472 -192
WIRE 632 -192 632 -224
WIRE 632 -192 552 -192
WIRE -744 -176 -744 -208
WIRE -632 -176 -632 -208
WIRE -520 -176 -520 -208
WIRE 632 -144 632 -192
WIRE 680 -144 632 -144
WIRE 216 -112 216 -192
WIRE 280 -112 216 -112
WIRE 376 -112 376 -192
WIRE 376 -112 360 -112
WIRE 472 -112 472 -192
WIRE 488 -112 472 -112
WIRE 632 -112 632 -144
WIRE 632 -112 568 -112
WIRE -40 -80 -40 -176
WIRE 56 -80 -40 -80
WIRE -40 -48 -40 -80
WIRE 216 -48 216 -112
WIRE 632 -48 632 -112
WIRE 376 -32 376 -112
WIRE 504 -32 376 -32
WIRE -280 0 -328 0
WIRE -248 0 -280 0
WIRE -104 0 -168 0
WIRE 344 0 280 0
WIRE 472 0 472 -112
WIRE 472 0 344 0
WIRE 504 0 504 -32
WIRE 568 0 504 0
WIRE 344 64 344 0
WIRE 504 64 504 0
WIRE -40 80 -40 48
WIRE 216 80 216 48
WIRE 632 80 632 48
WIRE -280 144 -280 0
WIRE -216 144 -280 144
WIRE 344 144 344 128
WIRE 344 144 -136 144
WIRE 232 208 216 208
WIRE 344 208 344 144
WIRE 344 208 296 208
WIRE 504 208 504 128
WIRE 568 208 504 208
WIRE 184 240 184 224
WIRE 184 240 168 240
WIRE 216 240 216 208
WIRE 216 240 184 240
WIRE 216 272 216 240
WIRE 344 272 216 272
WIRE 344 288 344 272
WIRE 504 288 504 208
WIRE 504 288 408 288
WIRE 56 352 56 -80
WIRE 568 352 568 288
WIRE 568 352 56 352
FLAG 216 80 0
FLAG -40 80 0
FLAG 744 -352 Vp
IOPIN 512 -240 In
FLAG 680 -144 2+
IOPIN 448 -32 In
FLAG -328 0 W2
IOPIN -560 112 In
FLAG 168 240 W1
IOPIN -64 352 In
FLAG 632 80 0
FLAG 184 224 1+
IOPIN -48 336 In
FLAG -744 -176 0
FLAG -632 -176 0
FLAG -520 -176 0
FLAG -744 -320 Vp
IOPIN -976 -208 In
FLAG -632 -320 W1
IOPIN -864 -208 In
FLAG -520 -320 W2
IOPIN -752 -208 In
SYMBOL npn 280 -48 M0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 568 -48 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL npn -104 -48 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res 200 -320 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 616 -320 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 376 -128 R90
SYMATTR InstName R3
SYMATTR Value 47k
SYMBOL res 584 -128 R90
SYMATTR InstName R4
SYMATTR Value 47k
SYMBOL res 584 304 R180
SYMATTR InstName R5
SYMATTR Value 200k
SYMBOL res -232 160 R270
SYMATTR InstName R6
SYMATTR Value 200k
SYMBOL res -56 -272 R0
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL res -152 -16 R90
SYMATTR InstName R8
SYMATTR Value 100k
SYMBOL cap 296 192 R90
SYMATTR InstName C1
SYMATTR Value 100p
SYMBOL cap 408 272 R90
SYMATTR InstName C2
SYMATTR Value 100p
SYMBOL cap 360 -208 R90
SYMATTR InstName C3
SYMATTR Value 39p
SYMBOL cap 552 -208 R90
SYMATTR InstName C4
SYMATTR Value 39p
SYMBOL diode 328 64 R0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 488 64 R0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL voltage -744 -304 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -632 -304 R0
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 0 1n 1n 0.05m 0.1m)
SYMBOL voltage -520 -304 R0
SYMATTR InstName V3
SYMATTR Value PWL REPEAT FOREVER (0 5 0.075m 5 0.075000001m 0 0.175m 0 0.175000001m 5 0.2m 5) ENDREPEAT