Re: The finer points of a balanced circuit

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In Reply to: The finer points of a balanced circuit posted by DrM on May 8, 2000 at 07:26:21:

The floawing circuit is not used much for volume control for good reason - it creates high source impedance. While some circuits might be OK with it, other might complain.
For example, at low volume point, there the signal is very low, most grounded volume control circuits will have source impedance of close to zero. Therefore low noise. The floating circuit will still have high impedance, and will most probably have too much noise at that point.
You always need to consider the volume control's resistance vs. position.
Floating circuit is best used for small amount of gain trimming, like in balance adjustment. Can also be used nicely in a floating RIAA or any other filtering circuit.
Use the grounded one.
BTW, your circuit would not "float everywhere", most likely. It is common to establish some DC reference, either by default ot intentionally.

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Follow Ups Full Thread

Topic - The finer points of a balanced circuit - DrM 07:26:21 05/08/00 (3)

Re: The finer points of a balanced circuit - Victor Khomenko 07:44:56 05/08/00 (2)

Re: The finer points of a balanced circuit - DrM 07:59:37 05/08/00 (1)

Re: The finer points of a balanced circuit - Victor Khomenko 08:27:26 05/08/00 (0)

Follow Ups

Re: The finer points of a balanced circuit - Victor Khomenko 07:44:56 05/08/00 (2)

Re: The finer points of a balanced circuit - DrM 07:59:37 05/08/00 (1)

Re: The finer points of a balanced circuit - Victor Khomenko 08:27:26 05/08/00 (0)

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