[sdiy] [slightly-OT] Passive tone controls - coupling/biasing oninput signal

[Richie Burnett]

I'd AC couple the audio into the tone-control circuit.  I've got a Cambridge 
Audio amplifier here that appears to be DC-coupled *throughout*, and that 
makes nasty crunching/scratching noises when you turn the bass control if 
there is any hint of DC in the audio being fed in.

-Richie,

-----Original Message----- 
From: Justin Owen
Sent: Monday, March 09, 2015 12:37 PM
To: SDIY List
Subject: [sdiy] [slightly-OT] Passive tone controls - coupling/biasing 
oninput signal

Sorry for the OT - did ask this elsewhere but didn't get much of a response.

I'm looking to add some sort of passive tone control to a circuit - either 
the classic 3x pot 'FVM' Bass/Middle/Treble control or the 2x pot 
Bass/Treble Baxandall type.

Do either of those circuits have a requirement/preference that the input 
signal is AC-coupled - or will it receive a positively biased signal just as 
happily?

*My* optimum input signal for this project would be something of approx. 1V 
PP biased to about +2.5V.

I was trying to avoid too many bias/couple/bias/couple stages in an 
all-discrete circuit.

Thanks,

- Justin



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