[sdiy] DC blocking caps on inputs - or not?

[Colin f]

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of
> Richie Burnett
> 
> Tom W wrote:
> 
> > 10K is a bit low, but with 470n, you still get a -3dB point at 30Hz.
> > That's still probably low enough for a lot of (most?) applications.
> 
> Paul M wrote:
> 
> > If you don't *HAVE* to use caps in the audio path, don't.
> > Everything you put in the path affects the signal, so the less you can
> > put in the path, the less the signal is messed with.
> 
> Agreed. Even if the amplitude loss at 20Hz isn't too bad, undersized
coupling
> capacitors still cause significant phase-lead at higher frequencies. If a
signal
> passes through several undersized coupling capacitors throughout the audio
> chain the phase of the bass end of the spectrum can get quite messed up.

But if there's any kind of gain going on, you don't want DC offset eating up
your signal headroom, and you never want a DC offset across and audio level
pot if it can be avoided.
Seems easy enough to stick to a couple of hundred uFs here and there.

Cheers,
Colin f