# BJT Transistor Bias Voltage Calculator

Enter value and click on calculate. Result will be displayed.

Base Bias Type:
Volts Rb = Base Resistance
Vin = Input Voltage
Rc = Collector Resistance
Re = Emitter Resistance
Vs = Supply Voltage
Vc = Collector Voltage
Ve = Emitter Voltage
Vb = Base Voltage
I_b=[V_i n-Base t o Emitter Drop]/[R_b+Curren t gai n×R_e]
Ic = Collector gain x Ib
Ve = IC x Re
Vb = Ve x Base to Emitter Drop
Vc = Vs - IC x Rc
If (Vc < Ve) then,
V_e=[V_s×R_e]/[R_e+R_c]
Vc = Ve
Vb = Ve + Base to Emitter Drop
I_c=V_s/[R_e+R_c]

Base Resistance (Rb):
K Ohms
Input Voltage (Vin):
Volts
Collector Resistance (Rc):
K ohms
Emitter Resistance (Re):
K ohms
Supply Voltage (Vs):
Volts
Current gain:
Base to Emitter Drop:
Volts

Result:

Collector Voltage (Vc):
Volts
Emitter Voltage (Ve):
Volts
Base Voltage (Vb):
Volts
Collector Voltage (Ic):
mA
Base Voltage (Ib):
mA
BJT Transistor Biasing Calculator This calculator will compute the values of the biasing resistors required to provide the maximum output voltage swing in a NPN bipolar junction transistor (BJT) amplifier circuit. The algorithm makes use of AC and DC load line theory and formulas and is one of the most accurate you will find online. The circuit above is that of a typical common emitter amplifier with resistors at the emitter junction, and collector junction. Engineers usually need to calculate the values of resistors R1 and R2 so that the transistor provides maximum undistorted output. The algorithms I use here will also find the operating point (Q), which is useful if you are a student making calculations by hand.
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