Version 4
SHEET 1 1032 680
WIRE 64 96 48 96
WIRE 192 96 144 96
WIRE 288 96 272 96
WIRE 368 96 288 96
WIRE 464 96 368 96
WIRE 560 96 544 96
WIRE 288 160 288 96
WIRE 368 160 368 96
WIRE 48 192 48 96
WIRE 144 192 144 96
WIRE 560 192 560 160
WIRE 288 272 288 224
WIRE 368 272 368 240
FLAG 48 272 0
FLAG 288 272 0
FLAG 368 272 0
FLAG 48 96 Vin
FLAG 368 96 Vout
FLAG 560 272 0
FLAG 144 256 0
SYMBOL voltage 48 176 R0
WINDOW 3 -27 140 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value EXP(28v 174v 5ms 10ms 0ms 250ms)
SYMATTR InstName V1
SYMBOL res 176 112 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 100K
SYMBOL res 352 144 R0
SYMATTR InstName R2
SYMATTR Value 18K
SYMBOL cap 272 160 R0
SYMATTR InstName C1
SYMATTR Value 0.1µF
SYMBOL res 448 112 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 1R
SYMBOL voltage 560 176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL diode 544 96 R0
SYMATTR InstName D1
SYMBOL zener 160 256 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value 1N5369B
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 160 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 2R
TEXT 16 344 Left 2 !.tran 1s
TEXT 440 8 Left 2 ;Analog Input intrinsic diode and\nsmall R for current measurement