XO-1.5 audio input DC mode

C. Scott Ananian cscott at laptop.org
Wed Nov 24 10:47:58 EST 2010

On Wed, Nov 24, 2010 at 6:52 AM, Sascha Silbe
<sascha-ml-reply-to-2010-3 at silbe.org> wrote:
> 2. The voltage I see with bias off is probably generated internally by
>   the codec chip. [...]
>   Unless someone finds a magic way to disable this from the digital
>   side of the chip (which I doubt), we'll have to cope with it. This
>   means that we need an external buffer circuit in order to prevent the
>   XO-1.5 from feeding voltage back into the measured circuit.

What is the impedance of your input?  What's the capacitance?

I can see getting some leakage current into a high-impedance
high-capacitance circuit, but for most purposes this shouldn't really
be a problem.

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