Version 4 SHEET 1 1196 688 WIRE 224 144 80 144 WIRE 448 144 304 144 WIRE 544 144 448 144 WIRE 688 144 544 144 WIRE 80 240 80 144 WIRE 448 240 448 144 WIRE 544 240 544 144 WIRE 80 448 80 320 WIRE 448 448 448 304 WIRE 448 448 80 448 WIRE 544 448 544 304 WIRE 544 448 448 448 WIRE 688 448 544 448 WIRE 688 480 688 448 FLAG 688 480 0 FLAG 688 144 OUT SYMBOL voltage 80 224 R0 WINDOW 3 11 111 Left 2 SYMATTR Value 0V SYMATTR InstName Vi SYMBOL res 320 128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL diode 464 240 M0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 528 304 M180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D2 SYMATTR Value 1N4148 TEXT 192 552 Left 2 !.DC Vi -5V 5V 100mV