Version 4 SHEET 1 1224 816 WIRE 432 -240 432 -288 WIRE -112 -192 -112 -256 WIRE 16 -192 16 -256 WIRE 304 -192 272 -192 WIRE 368 -192 304 -192 WIRE 272 -128 272 -192 WIRE -112 -48 -112 -112 WIRE 16 -48 16 -112 WIRE 432 0 432 -144 WIRE 592 0 432 0 WIRE 672 0 592 0 WIRE 272 16 272 -48 WIRE 160 32 160 -16 WIRE 592 32 592 0 WIRE 160 128 160 112 WIRE 256 128 160 128 WIRE 592 144 592 112 WIRE 160 160 160 128 WIRE 432 160 432 0 WIRE 256 208 256 128 WIRE 256 208 224 208 WIRE 304 208 256 208 WIRE 368 208 304 208 WIRE 160 336 160 256 WIRE 432 336 432 256 FLAG -112 -48 0 FLAG 16 -48 0 FLAG -112 -256 VCC FLAG 16 -256 VCC- FLAG 432 336 VCC- FLAG 160 336 VCC- FLAG 160 -16 0 FLAG 432 -288 VCC FLAG 272 16 0 FLAG 592 144 0 FLAG 672 0 OUT FLAG 304 -192 IN FLAG 304 208 bias SYMBOL npn 368 160 R0 SYMATTR InstName Q2 SYMATTR Value 2N2222 SYMBOL voltage -112 -208 R0 SYMATTR InstName Vps+ SYMATTR Value 15V SYMBOL voltage 16 -208 R0 SYMATTR InstName Vps- SYMATTR Value -15V SYMBOL npn 224 160 M0 SYMATTR InstName Q3 SYMATTR Value 2N2222 SYMBOL res 144 16 R0 SYMATTR InstName R1 SYMATTR Value 5k SYMBOL npn 368 -240 R0 SYMATTR InstName Q1 SYMATTR Value 2N2222 SYMBOL voltage 272 -144 R0 WINDOW 0 -68 19 Left 2 WINDOW 3 -197 -8 Left 2 SYMATTR InstName Vin SYMATTR Value SINE(0V {Amp} 1000) SYMBOL res 576 16 R0 SYMATTR InstName RL SYMATTR Value 1k TEXT 120 528 Left 2 ;.OP TEXT 64 480 Left 2 ;Spice Directive TEXT 16 568 Left 2 !.DC Vin -20V +20V 100mV TEXT 32 624 Left 2 ;.TRAN 10us 3ms 0ms 10us TEXT -16 672 Left 2 ;.STEP PARAM Amp LIST 1V 2.7V 10V