Version 4
SHEET 1 880 680
WIRE 224 -192 96 -192
WIRE 96 -160 96 -192
WIRE 224 -128 224 -192
WIRE 96 -48 96 -80
WIRE 224 32 224 -48
WIRE 224 32 96 32
WIRE 288 32 224 32
WIRE 368 32 288 32
WIRE 96 48 96 32
WIRE 224 128 224 32
WIRE -16 176 -128 176
WIRE 96 176 96 128
WIRE 96 176 48 176
WIRE 160 176 96 176
WIRE -128 224 -128 176
WIRE 96 240 96 176
WIRE -128 352 -128 304
WIRE 96 352 96 320
WIRE 224 352 224 224
FLAG 224 352 0
FLAG 96 352 0
FLAG 96 -48 0
FLAG -128 352 0
FLAG 368 32 out
DATAFLAG 288 32 ""
SYMBOL npn 160 128 R0
SYMATTR InstName Q1
SYMBOL res 208 -144 R0
SYMATTR InstName R1
SYMATTR Value 4.7k
SYMBOL res 80 32 R0
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL res 80 224 R0
SYMATTR InstName R3
SYMATTR Value 24k
SYMBOL voltage 96 -176 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL cap -16 192 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL voltage -128 208 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 {A} 1k)
TEXT 16 -176 Left 2 !.op
TEXT -136 -304 Left 2 !.step param A list 2m 20m
TEXT -136 -336 Left 2 !.tran 0 10m 8m
TEXT -136 -272 Left 2 !.param A 2m