[sdiy] Interpreting PEQ schematic help

[Richie Burnett]

> What's the advantage of doing this, rather than using a switch connected 
> to the output buffer that toggles between either the processed or the 
> unprocessed signal?
> Less click?

Yes.  Otherwise a break-before-make switch would produce a brief but 
abruptly muted section when the wiper of the switch moves from processed to 
unprocessed.  (And a make-before-break switch would short the processed and 
unprocessed signals together for a brief period every time the switch is 
toggled.)

One downside of this method is that you probably get significant HF bleed 
when the switch is connected to the op-amp output, because the other output 
is still connected to the output through the resistor.  Op-amp output 
impedance rises with increasing frequency.

-Richie, 


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