Version 4
SHEET 1 1536 680
WIRE 80 80 0 80
WIRE 208 80 160 80
WIRE 320 80 208 80
WIRE 480 80 368 80
WIRE 624 80 560 80
WIRE 736 80 624 80
WIRE 896 80 784 80
WIRE 1024 80 976 80
WIRE 1040 80 1024 80
WIRE 1136 80 1040 80
WIRE 1296 80 1184 80
WIRE 1440 80 1376 80
WIRE 368 96 368 80
WIRE 784 96 784 80
WIRE 1184 96 1184 80
WIRE 208 112 208 80
WIRE 320 112 320 80
WIRE 624 112 624 80
WIRE 736 112 736 80
WIRE 1040 112 1040 80
WIRE 1136 112 1136 80
WIRE 1440 112 1440 80
WIRE 0 208 0 80
WIRE 208 208 208 176
WIRE 208 208 0 208
WIRE 320 208 320 160
WIRE 320 208 208 208
WIRE 368 208 368 176
WIRE 368 208 320 208
WIRE 624 208 624 176
WIRE 624 208 368 208
WIRE 736 208 736 160
WIRE 736 208 624 208
WIRE 784 208 784 176
WIRE 784 208 736 208
WIRE 1040 208 1040 176
WIRE 1040 208 784 208
WIRE 1136 208 1136 160
WIRE 1136 208 1040 208
WIRE 1184 208 1184 176
WIRE 1184 208 1136 208
WIRE 1440 208 1440 176
WIRE 1440 208 1184 208
WIRE 0 240 0 208
FLAG 0 240 0
FLAG 208 80 n1
FLAG 624 80 n2
FLAG 1024 80 n3
FLAG 1440 80 n4
SYMBOL cap 192 112 R0
SYMATTR InstName C1
SYMATTR Value 1
SYMBOL res 176 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 29 77 VTop 2
SYMATTR InstName R1
SYMATTR Value {3.82*24*60/ln(2)}
SYMBOL e 368 80 R0
SYMATTR InstName E1
SYMATTR Value 1
SYMBOL res 576 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value {3.05/ln(2)}
SYMBOL cap 608 112 R0
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL e 784 80 R0
SYMATTR InstName E2
SYMATTR Value 1
SYMBOL res 992 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value {26.8/ln(2)}
SYMBOL cap 1024 112 R0
SYMATTR InstName C3
SYMATTR Value 1
SYMBOL e 1184 80 R0
SYMATTR InstName E3
SYMATTR Value 1
SYMBOL res 1392 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value {19.9/ln(2)}
SYMBOL cap 1424 112 R0
SYMATTR InstName C4
SYMATTR Value 1
TEXT 168 248 Left 2 !.IC V(n1)=1
TEXT 336 312 Left 2 !.tran 0 300 0 0.1
TEXT 560 248 Left 2 !.IC V(n2)=0.3
TEXT 984 248 Left 2 !.IC V(n3)=0.2
TEXT 1368 248 Left 2 !.IC V(n4)=0.1