Version 4 SHEET 1 880 680 WIRE -272 160 -272 144 WIRE -272 272 -272 240 WIRE -224 16 -224 -16 WIRE -224 112 -224 96 WIRE -192 144 -272 144 WIRE -96 192 -96 160 WIRE -96 304 -96 272 WIRE -80 -16 -224 -16 WIRE -80 16 -80 -16 WIRE -80 144 -128 144 WIRE -80 144 -80 96 WIRE -80 160 -96 160 WIRE -80 160 -80 144 WIRE 16 144 -80 144 WIRE 80 -16 -80 -16 WIRE 80 16 80 -16 WIRE 80 384 80 352 WIRE 160 192 80 192 WIRE 160 272 80 272 WIRE 160 272 160 256 WIRE 208 96 80 96 WIRE 368 96 272 96 WIRE 400 96 368 96 WIRE 400 112 400 96 WIRE 400 224 400 192 FLAG -96 304 0 FLAG 80 384 0 FLAG 400 224 0 FLAG -272 272 0 FLAG -224 112 0 FLAG 368 96 out SYMBOL res 64 0 R0 SYMATTR InstName R1 SYMATTR Value 500 SYMBOL npn 16 96 R0 SYMATTR InstName Q1 SYMATTR Value 2N2222 SYMBOL res 64 176 R0 SYMATTR InstName R2 SYMATTR Value 150 SYMBOL res 64 256 R0 SYMATTR InstName R3 SYMATTR Value 39 SYMBOL res -96 0 R0 SYMATTR InstName R4 SYMATTR Value 15k SYMBOL res -112 176 R0 SYMATTR InstName R5 SYMATTR Value 4k SYMBOL res 384 96 R0 SYMATTR InstName R6 SYMATTR Value 500 SYMBOL cap 144 192 R0 SYMATTR InstName C1 SYMATTR Value 100µ SYMBOL cap 272 80 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value 47µ SYMBOL cap -128 128 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C3 SYMATTR Value 100µ SYMBOL Misc\\battery -224 0 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL voltage -272 144 R0 WINDOW 123 24 120 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value SINE(0 600m 1000) SYMATTR Value2 AC AC 1 TEXT 152 360 Left 0 ;tutorial drawing for LTSpice TEXT 256 40 Left 0 !;op TEXT 256 16 Left 0 !;tran 0 .1 0 TEXT 264 64 Left 0 !.ac oct 20 10 1e6