Version 4 SHEET 1 1612 680 WIRE 368 -16 208 -16 WIRE 208 0 208 -16 WIRE 32 96 16 96 WIRE 208 96 208 80 WIRE 208 96 112 96 WIRE 240 96 208 96 WIRE 368 96 368 -16 WIRE -192 144 -224 144 WIRE -96 144 -128 144 WIRE 16 144 16 96 WIRE 16 144 -16 144 WIRE 144 144 16 144 WIRE -224 160 -224 144 WIRE 208 288 208 192 WIRE 368 288 368 176 WIRE -224 304 -224 240 FLAG 240 96 Vout FLAG 208 288 0 FLAG 368 288 0 FLAG -224 304 0 SYMBOL Misc\\battery 368 80 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName Vcc SYMATTR Value 5 SYMBOL npn 144 96 R0 SYMATTR InstName Q1 SYMATTR Value Q2SC1815 SYMBOL res 192 -16 R0 SYMATTR InstName Rc SYMATTR Value 1.5K SYMBOL res 16 112 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName Rb2 SYMATTR Value 220K SYMBOL voltage -224 144 R0 WINDOW 123 24 124 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value2 AC 1 SYMATTR InstName Vs SYMATTR Value SINE(0 50m 1K 0 0) SYMBOL res -112 160 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName Rb1 SYMATTR Value 4.7K SYMBOL cap -192 160 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C1 SYMATTR Value 3.3u TEXT -240 344 Left 2 !.MODEL Q2SC1815 NPN (IS=1E-14 BF={HFE} XTB=1.7 BR=3.6 VA=100 RB=50 RC=0.76 IK=0.25 CJC=4.8p CJE=18p TF=0.5n TR=20n) TEXT -248 408 Left 2 !;tran 2ms TEXT -248 376 Left 2 !.step param HFE list 120 170 240 TEXT -256 448 Left 2 !.ac dec 20 10 100K