In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Kevin,

I would not worry about the sound quality when rectifying and filtering the audio signal as long as you take care that the load attached to the soundcard's line out is not too low. Using a tranformer does not reduce the load when you use a 1:1 transformer.

I like Bean's idea using the comparator, as this seems to me the solution requiring a minimum of external components - see the attached schematic. I only estimated the component values, so some experimenting might be in order but using a relatively large resistor in series with the audio signal makes sure that the sound card almost does not "see" this circuit, i.e. there is a minimum load only.

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