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You are here: Home / Transistor base Resistor Calculator

Transistor base Resistor Calculator

Calculator

Vbe

Vce

hFE

First you must check the datasheet of the transistor in question and identify the values Vbe, Vce, and hFE. These values are responsible for enabling transistor saturation. Here the example numbers shown are for the BJT BC548.

RL

Vcc

Vi

The load resistance RL is indicated in ohms, the supply voltage input is indicated as Vcc, and the input trigger voltage is indicated as Vi.

Rb:

Reader Interactions

Comments

  1. JOHN CROW says

    Can you tell me the formula for this calculation?

    Reply
    • Swagatam says

      R = (base input Voltage – 0.6) / Collector load current

      Reply
      • JOHN CROW says

        Thank You

        Reply
  2. Alan Corey says

    Glad to see somebody did this. I think it could be expanded to provide most or all of the numbers required for Dual Feedback Transistor Biasing if the right numbers are fed into it. Most of the numbers on https://www.electronics-tutorials.ws/amplifier/transistor-biasing.html for example could be worked out. I think, right now I want to build a preamp, not write a program.

    Reply
  3. Jeroen Vrij says

    What means NAN

    Reply
    • Swagatam says

      not a number

      https://en.wikipedia.org/wiki/NaN

      Reply
  4. yunishe anslemo says

    Pls I want to begin with wireless circuits

    Reply
  5. Hamid Hussain says

    Vce if bc548 is very low

    Reply
  6. Hamid Hussain says

    If the transistor is bc547 what should be base resistor

    Reply
    • Swag says

      Vce is the saturation voltage (minimum).

      for BC547 you have to only consider the hFe and the RL, rest all can be as it is

      Reply

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