Pre-emphasis Tuned amplifier VS. HPF

Discussion in 'General Electronics Chat' started by vinodquilon, Mar 19, 2010.

  1. vinodquilon

    Thread Starter Member

    Dec 24, 2009
    I am using two different setups for pre-emphasis, tuned amplifier & HPF.

    What is the equation for the selection of tuning range in tuned amplifier case ?

    In HPF I am using R5 to make satisfactory working at high frequencies as capacitor act
    as a short. Does this cause any additional poles to create ? If yes, pls give me net
    cut-off frequency equation.

    I am using LPF as De-emphasis circuit.
  2. Audioguru


    Dec 20, 2007
    Like I said on the other website, the inductor does not tune the circuit, it simply causes the transistor to have more gain at higher frequencies if its load is a high resistance. The resistor in series stops the inductor from shorting low frequencies.

    your RC pre-emphasis circuit has only a small amount of boost (6dB) at high frequencies.