Version 4 SHEET 1 880 680 WIRE 160 0 128 0 WIRE 224 0 160 0 WIRE 224 32 224 0 WIRE 128 128 128 0 WIRE 224 144 224 112 WIRE 16 240 -16 240 WIRE 128 240 128 208 WIRE 128 240 96 240 WIRE 176 240 128 240 WIRE 208 240 176 240 WIRE 336 240 288 240 WIRE 448 240 336 240 WIRE -16 272 -16 240 WIRE 128 272 128 240 WIRE 336 272 336 240 WIRE -16 384 -16 336 WIRE 128 384 128 336 WIRE 128 384 -16 384 WIRE 336 384 336 352 WIRE 336 384 128 384 WIRE 128 432 128 384 FLAG 128 432 0 FLAG 224 144 0 FLAG 448 240 OUT FLAG -16 240 n1 FLAG 160 0 n3 FLAG 176 240 n2 SYMBOL cap -32 272 R0 WINDOW 40 24 78 Left 2 SYMATTR InstName C1 SYMATTR Value 1µF SYMBOL cap 112 272 R0 SYMATTR InstName C2 SYMATTR Value 1µF SYMBOL res 320 256 R0 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL res 112 112 R0 SYMATTR InstName R2 SYMATTR Value 1k SYMBOL res 304 224 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL res 112 224 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL voltage 224 16 R0 SYMATTR InstName VCC SYMATTR Value 5V TEXT 16 512 Left 2 !.TRAN 500us 10ms 0ms 500us TEXT 184 480 Left 2 ;.OP TEXT 128 552 Left 2 ;.IC V(n1)=+1V