AMZ Super Buffer C4

[krister]

What does C4 do in the AMZ Super Buffer circuit?

http://www.muzique.com/lab/superbuff.htm

Thanks!

[Tony Forestiere]

Looks to be a power/noise filter for the voltage supply(?).

[Mark Hammer]

It just stabilizes the Vref, so that there is no line noise there.  Remember, you need to think about Vref (floating ground) as kind of another supply voltage, and you always need to keep your supply voltages clean.

[krister]

Thanks. I thought it was for the power supply so I upped the value to 100uF. I just wanted to make sure it didn't affect the tone in a negative way.