What is the purpose of the resister?

Discussion in 'General Electronics Chat' started by PSIR, Jan 20, 2011.

  1. PSIR

    Thread Starter Member

    Apr 23, 2008
    29
    0
    Hello everyone,

    Please take a look at the circuit of attached file.

    This diagram is a INVERTER AMPLIFY.

    There is resister(R3) tied positive input to ground.

    What is its purpose? and how to determin the value?


    Thanks in advance
     
  2. debjit625

    Well-Known Member

    Apr 17, 2010
    790
    186
    R3 is bias current compensating resistor
    R3 = 1 / 1/R1 + 1/R2

    Good Luck
     
Loading...