Pre-emphasis Tuned amplifier VS. HPF

Thread Starter

vinodquilon

Joined Dec 24, 2009
234
I am using two different setups for pre-emphasis, tuned amplifier & HPF.
http://www.scribd.com/doc/28618656/

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.
 

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Audioguru

Joined Dec 20, 2007
11,249
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.
 
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