Version 4
SHEET 1 5320 680
WIRE -192 16 -240 16
WIRE -96 16 -112 16
WIRE -64 16 -96 16
WIRE 32 16 16 16
WIRE 64 16 32 16
WIRE 160 16 144 16
WIRE 192 16 160 16
WIRE 288 16 272 16
WIRE 352 16 288 16
WIRE 416 16 352 16
WIRE -96 32 -96 16
WIRE 32 32 32 16
WIRE 160 32 160 16
WIRE 288 32 288 16
WIRE -240 128 -240 16
WIRE -96 128 -96 112
WIRE 32 128 32 112
WIRE 160 128 160 112
WIRE 288 128 288 112
WIRE -240 256 -240 208
WIRE -96 256 -96 208
WIRE -96 256 -240 256
WIRE 32 256 32 208
WIRE 32 256 -96 256
WIRE 160 256 160 208
WIRE 160 256 32 256
WIRE 288 256 288 208
WIRE 288 256 160 256
WIRE -96 272 -96 256
FLAG -96 272 0
FLAG 352 16 DAC
SYMBOL res -208 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -256 112 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL voltage -96 112 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 5 0 10n 10n 1u 2u)
SYMBOL res -112 16 R0
SYMATTR InstName R3
SYMATTR Value 20k
SYMBOL res -80 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL voltage 32 112 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 0 10n 10n 2u 4u)
SYMBOL res 16 16 R0
SYMATTR InstName R5
SYMATTR Value 20k
SYMBOL res 48 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL voltage 160 112 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 5 0 10n 10n 4u 8u)
SYMBOL res 144 16 R0
SYMATTR InstName R7
SYMATTR Value 20k
SYMBOL res 176 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R8
SYMATTR Value 10k
SYMBOL voltage 288 112 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value PULSE(0 5 0 10n 10n 8u 16u)
SYMBOL res 272 16 R0
SYMATTR InstName R9
SYMATTR Value 20k
TEXT -128 336 Left 2 !.tran 20u startup