Version 4 SHEET 1 1348 728 WIRE 400 240 400 208 WIRE 400 304 400 352 WIRE 400 112 400 80 WIRE 336 160 256 160 WIRE 256 160 256 256 WIRE 192 304 160 304 WIRE 256 352 256 400 WIRE 256 400 336 400 WIRE 400 448 400 544 WIRE 80 240 80 128 WIRE 80 128 80 80 WIRE 128 192 160 192 WIRE 160 192 160 304 WIRE 160 304 128 304 WIRE 32 192 -96 192 WIRE 32 304 -16 304 WIRE 256 160 256 80 WIRE 80 0 80 -32 WIRE 80 -32 256 -32 WIRE 400 -32 400 0 WIRE 256 0 256 -32 WIRE 256 -32 400 -32 WIRE 256 400 256 432 WIRE 256 512 256 544 WIRE 256 544 400 544 WIRE 256 544 -16 544 WIRE 400 352 512 352 WIRE -160 -32 80 -32 WIRE -16 304 -160 304 WIRE -96 192 -160 192 WIRE -656 576 -656 544 WIRE -560 304 -656 304 WIRE -656 304 -656 400 WIRE -656 480 -656 544 WIRE -656 -32 -656 16 WIRE -656 96 -656 128 WIRE -560 192 -800 192 WIRE -160 192 -480 192 WIRE -160 -32 -656 -32 WIRE -160 304 -480 304 WIRE -160 544 -496 544 WIRE -576 544 -656 544 WIRE -16 416 -16 304 WIRE -96 416 -96 192 WIRE -96 480 -96 544 WIRE -16 544 -96 544 WIRE -16 480 -16 544 WIRE -96 544 -160 544 WIRE -800 576 -800 480 WIRE -800 192 -800 400 FLAG -656 576 0 FLAG -656 128 0 FLAG 512 352 out FLAG -160 192 in1 FLAG -160 304 in2 FLAG -160 -32 vcc FLAG -160 544 vss FLAG -800 576 0 SYMBOL npn 128 128 R90 SYMATTR InstName Q1 SYMATTR Value N1 SYMBOL npn 192 256 R0 SYMATTR InstName Q4 SYMATTR Value N1 SYMBOL npn 336 352 R0 SYMATTR InstName Q5 SYMATTR Value N1 SYMBOL npn 336 112 R0 SYMATTR InstName Q6 SYMATTR Value N1 SYMBOL diode 384 240 R0 SYMATTR InstName D1 SYMATTR Value DD SYMBOL res 240 -16 R0 SYMATTR InstName RC4 SYMATTR Value 1.6k SYMBOL res 384 -16 R0 SYMATTR InstName RC6 SYMATTR Value 130 SYMBOL res 64 -16 R0 SYMATTR InstName RB1 SYMATTR Value 4k SYMBOL res 240 416 R0 SYMATTR InstName RE4 SYMATTR Value 1k SYMBOL npn 128 240 R90 SYMATTR InstName Q2 SYMATTR Value N1 SYMBOL voltage -656 384 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value PULSE(0 3 0 1n 1n 299n 500n ) SYMBOL res -576 320 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R3 SYMATTR Value 100 SYMBOL voltage -656 0 R0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL res -576 208 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R4 SYMATTR Value 100 SYMBOL res -592 560 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R5 SYMATTR Value 1µ SYMBOL diode 0 480 R180 WINDOW 0 -24 65 Left 0 WINDOW 3 -30 2 Left 0 SYMATTR InstName D2 SYMATTR Value DD SYMBOL diode -80 480 R180 WINDOW 0 -22 70 Left 0 WINDOW 3 -24 4 Left 0 SYMATTR InstName D3 SYMATTR Value DD SYMBOL voltage -800 384 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -79 247 Left 0 SYMATTR InstName V3 SYMATTR Value PULSE(0 3 100n 1n 1n 299n 500n ) TEXT -152 -200 Left 0 !.MODEL N1 NPN BF=50 RB=70 RC=40 CJS=2p TF=0.1n\n+TR=10n CJE=1p CJC=1.5p VJC=0.85 VAF=50 TEXT -152 -128 Left 0 !.MODEL DD D RS=40 TT=0.1n CJ0=0.9p TEXT -664 -104 Left 0 !.tran 0 1u 0 10n TEXT -248 -312 Left 0 ;2-INPUT-NAND SN7400 TEXT 648 -88 Left 0 !.SUBCKT SN7400 in1 in2 vcc vss out\n* 2-INPUT-NAND SN7400\n*\nQ1 N004 N006 in1 0 N1\nQ2 N004 N006 in2 0 N1\nQ4 N003 N004 N005 0 N1\nQ5 out N005 vss 0 N1\nQ6 N002 N003 N001 0 N1\nD1 N001 out DD\nRC4 vcc N003 1.6k\nRC6 vcc N002 130\nRB1 vcc N006 4k\nRE4 N005 vss 1k\nD2 vss in2 DD\nD3 vss in1 DD\n.MODEL N1 NPN BF=50 RB=70 RC=40 CJS=2p TF=0.1n\n+TR=10n CJE=1p CJC=1.5p VJC=0.85 VAF=50\n.MODEL DD D RS=40 TT=0.1n CJ0=0.9p\n.ENDS TEXT 664 -160 Left 0 ;An equivalent subcircuit model RECTANGLE Normal 576 592 -256 -272