[sdiy] ...that 1K resistor on the output

[David G. Dixon]

> For a general output I would tend to set it up Op Amp > Cap>Resistor out
> with a bleed resistor 1M or more to ground.
> 
> The reasoning is the with the output resistor last you get a time constant
> when random voltages hit the patch cord possibly providing some over
> voltage
> protection for the cap (electro-static etc.). The bleed resistor is as
> Harry
> states, for Pop reduction. A floating cap can build or retain some stray
> DC
> offset voltage that can cause the Pop (or worse) when the plug is
> inserted.

I've never used AC coupled outputs myself, but I should think that the bleed
resistor is critical, particularly if any of the input destinations go
directly to an opamp follower, because otherwise the input will drift to one
of the rails.  Of course, maybe it isn't such a good idea to have inputs go
directly to followers, and follower inputs should probably have bleed
resistors too, just in case.