Version 4
SHEET 1 880 820
WIRE -496 0 -592 0
WIRE -336 0 -416 0
WIRE -160 0 -256 0
WIRE -112 0 -160 0
WIRE -64 0 -112 0
WIRE 80 0 16 0
WIRE -592 48 -592 0
WIRE -160 64 -160 0
WIRE 80 64 80 0
WIRE -592 176 -592 128
WIRE -160 176 -160 128
WIRE 80 176 80 128
WIRE -480 256 -592 256
WIRE -64 256 -160 256
WIRE 48 256 -64 256
WIRE -160 288 -160 256
WIRE 48 288 48 256
WIRE -592 304 -592 256
WIRE -592 432 -592 384
WIRE -160 432 -160 368
WIRE 48 432 48 368
WIRE 48 432 -160 432
WIRE -160 448 -160 432
WIRE -480 576 -592 576
WIRE -64 576 -160 576
WIRE 48 576 -64 576
WIRE -160 608 -160 576
WIRE 48 608 48 576
WIRE -592 624 -592 576
WIRE -592 752 -592 704
WIRE -160 752 -160 688
WIRE 48 752 48 688
WIRE 48 752 -160 752
WIRE -160 768 -160 752
FLAG -592 176 0
FLAG 80 176 0
FLAG -160 176 0
FLAG -112 0 1
FLAG 80 0 2
FLAG -592 432 0
FLAG -480 256 ddt_bv_V1
FLAG -160 448 0
FLAG -64 256 ddt_bi_V1
FLAG -160 768 0
FLAG -64 576 ddt_bi_R1
FLAG -592 752 0
FLAG -480 576 ddt_bv_R1
SYMBOL voltage -592 32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V0
SYMATTR Value PULSE(0 1 1n 1n)
SYMBOL res -352 -16 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap 64 64 R0
SYMATTR InstName C1
SYMATTR Value 5m
SYMBOL res -80 -16 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL cap -176 64 R0
SYMATTR InstName C2
SYMATTR Value 500µ
SYMBOL bv -592 288 R0
SYMATTR InstName B1
SYMATTR Value V=ddt(I(V1))
SYMBOL voltage -512 0 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
SYMATTR InstName V1
SYMATTR Value 0
SYMBOL bi2 -160 288 R0
SYMATTR InstName B2
SYMATTR Value I=ddt(I(V1))
SYMBOL res 32 272 R0
SYMATTR InstName R3
SYMATTR Value 1
SYMBOL bi2 -160 608 R0
SYMATTR InstName B3
SYMATTR Value I=ddt(I(R1))
SYMBOL res 32 592 R0
SYMATTR InstName R4
SYMATTR Value 1
SYMBOL bv -592 608 R0
SYMATTR InstName B4
SYMATTR Value V=ddt(I(R1))
TEXT -584 -152 Left 2 !.tran 0 {30+3m} 1m 1m
TEXT -584 -120 Left 2 !.options plotwinsize=0
TEXT 144 288 Left 5 ;OK
TEXT -776 240 Left 5 ;OK
CIRCLE Normal 144 496 -304 208 2
CIRCLE Normal -272 496 -720 208 2