Version 4.1
SHEET 1 1240 680
WIRE 32 80 16 80
WIRE 128 80 32 80
WIRE 336 80 128 80
WIRE 336 112 336 80
WIRE 128 176 128 80
WIRE 336 240 336 192
WIRE -64 288 -144 288
WIRE 128 288 128 256
WIRE 128 288 0 288
WIRE 272 288 128 288
WIRE 336 368 336 336
WIRE 448 368 336 368
WIRE 592 368 512 368
WIRE 256 464 -144 464
WIRE 336 464 336 368
WIRE 336 464 256 464
WIRE 688 464 336 464
WIRE 256 512 256 464
FLAG 592 368 out
FLAG -144 288 in
FLAG 32 80 Vsupply
FLAG 256 512 0
SYMBOL res 112 160 R0
SYMATTR InstName R1
SYMBOL npn 272 240 R0
SYMATTR InstName Q1
SYMBOL res 320 96 R0
SYMATTR InstName R2
SYMATTR Value R_collector
SYMBOL cap 0 272 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMBOL cap 512 352 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
TEXT -168 -368 Left 4 ;Do not use this circuit in this form, \nuse common emmitter -2 or -3 instead
TEXT -176 -216 Left 2 ;the gain of a transistor varies by +/- 50% or even more, so when you buy \nanother transistor from a different production batch the gain can be different.\nThe biasing of this circuit is dependant on the gain of the transistor so use the \ncommon emmitter ccts -2 or -3 instead, where the biasing is independant of transistor gain.
TEXT -168 -424 Left 4 ;common emmitter-1
TEXT -176 -48 Left 2 ;the gain of this circuit is R_collector/R_emmitter\nas there is no external emmitter resistor the value is the internal emmitter resistance of the transistor.\nthis value varies with the emmitter current, causing distortion.
TEXT -168 -280 Left 2 ;no circuit values placed on this circuit because I don't think you should use it.
TEXT -176 -248 Left 4 ;unreliable bias point
TEXT -176 -88 Left 4 ;variable gain