At a collector current of 10mA, a 2N2222 transistor has a minimum β of 75 and is not spec'd for typical or maximum so let β be 100.Select β = 200 and calculate Ib.
No.Split Re for gain of 40.
No.Rc=(Vcc-Vce-Ve)/Ic
Vcc=18V, Vce=8V, Ve=(1/10)Vcc=1.8V, Ic=6mA
Rc=1.36kΩ
Re=Ve/Ic=1.8/6m=300Ω
R2=(1/10)β*Re=1/10*100*300=3kΩ
Vb=(Vcc*R2)/(R1+R2) -- (1)
Vb=Vbe+Ve, Vbe=0.7V, Ve=1.8V
Vb=2.5V
from (1)
R1=R2(Vcc-Vb)/Vb
R1=18.6k
so, R1=18.6kΩ, R2=3kΩ, Rc=1.36kΩ, Re=300Ω
Is this correct?
Were the formulas I used right?
what do u mean at 180? and how do i calculate the value for the unbypassed resistor? (what is the formula for it)The voltage gain will be much too high at about 180. The emitter needs an unbypassed resistor in series to add some negative feedback which reduces the gain and reduces the distortion.
I dont think that matters for this problem. We just use a simulator. (microcap)18.6k is not a standard value. Use 18k then the base voltage and currents are a little different.
what is the formula I use for this?The output resistor is simple to calculate and loads the output which reduces the output amplitude to set the gain at exactly 20.
Almost.So,
20=[Rc//Rl]/[Re]
Rc=1.36k
but what is Rl and Re? And the internal emitter resistance?
No.I don't understand what you mean for the capacitors?
for the bypass cap:
the resistor value is 300
so:
X=[1]/[2*pi*f*C]
C=[1/30]/[2*pi*1000]
C=5.31uF
is that right? if not what is the right formula?
by Aaron Carman
by Duane Benson
by Jake Hertz
by Duane Benson