Version 4 SHEET 1 3768 1236 WIRE 528 -32 384 -32 WIRE 1472 -32 528 -32 WIRE 384 32 384 -32 WIRE 528 96 528 -32 WIRE 1472 112 1472 -32 WIRE 384 144 384 112 WIRE 1472 320 1472 192 WIRE 1184 400 1072 400 WIRE 1216 400 1184 400 WIRE 1312 400 1280 400 WIRE 1392 400 1312 400 WIRE 1424 400 1392 400 WIRE 528 480 528 176 WIRE 1312 496 1312 400 WIRE 1312 496 1280 496 WIRE 1392 512 1392 400 WIRE 1072 544 1072 400 WIRE 1184 544 1184 400 WIRE 1216 544 1184 544 WIRE 352 560 -96 560 WIRE 480 560 352 560 WIRE -96 592 -96 560 WIRE -96 720 -96 672 WIRE 528 720 528 576 WIRE 528 720 -96 720 WIRE 576 720 528 720 WIRE 1072 720 1072 624 WIRE 1280 720 1280 592 WIRE 1280 720 1072 720 WIRE 1392 720 1392 592 WIRE 1392 720 1280 720 WIRE 1472 720 1472 416 WIRE 1472 720 1392 720 WIRE 1552 720 1472 720 WIRE 528 800 528 720 WIRE 1472 800 1472 720 WIRE 528 976 528 880 WIRE 1472 976 1472 880 FLAG 384 144 0 FLAG 528 976 0 FLAG 352 560 in FLAG 576 720 out FLAG 1472 976 0 FLAG 1024 560 in FLAG 1024 608 out FLAG 1552 720 out2 SYMBOL voltage 384 16 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 500 SYMBOL voltage -96 576 R0 WINDOW 123 24 132 Left 2 WINDOW 39 24 44 Left 2 WINDOW 3 36 93 Left 2 SYMATTR Value PULSE(4 8 2u 1n 1n 10u 20u 2) SYMATTR InstName V2 SYMBOL res 512 784 R0 SYMATTR InstName R4 SYMATTR Value {Rload} SYMBOL res 512 80 R0 SYMATTR InstName R1 SYMATTR Value 2k SYMBOL nmos 1424 320 R0 SYMATTR InstName M3 SYMATTR Value STP8NM60 SYMBOL diode 1216 416 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL res 1376 496 R0 SYMATTR InstName R2 SYMATTR Value 1k SYMBOL nmos 480 480 R0 SYMATTR InstName M1 SYMATTR Value STP8NM60 SYMBOL res 1456 784 R0 SYMATTR InstName R3 SYMATTR Value {Rload} SYMBOL e 1072 528 R0 SYMATTR InstName E1 SYMATTR Value 1 SYMBOL res 1456 96 R0 SYMATTR InstName R5 SYMATTR Value 2k SYMBOL pnp 1216 592 M180 SYMATTR InstName Q1 SYMATTR Value 2N3906 TEXT -16 432 Left 2 !.tran 40u TEXT -280 912 Left 2 !.param Rload=2k5 TEXT -384 984 Left 2 !.step param Rload list 2k 4k 10k 20k TEXT -16 496 Left 2 !;dc V2 4 8 .05