[sdiy] Electrolytic Caps for Audio Decoupling

[Grant Richter]

>>
> In the THAT datasheets and design notes they show polarized caps  
> with the negative end connected via a resistor to the IC inputs  
> which are at virtual ground.  And in fact many times I have seen  
> polarized caps used in places like this where in all likelyhood the  
> polarity will be reversed about half of the time.
>

Once again, there is no voltage difference between the plates of the  
cap because of the high impedance.
Consider it as a voltage divider.
Any resistor value into a very high impedance will have no  
significant voltage drop across it, because there is no current flow  
to cause a voltage drop.