AudioBanter.com - View Single Post - DELTA

In article writes:

A couple of sections of the 4PDT TB switch in my Soundcraft Delta mute the
L/R inputs to the control room monitor line amps by shorting the inputs to
ground.

Curiously, the current L/R paths to ground in the TB switching circuit go
through 0 (zero) ohm resistors. I'd never seen such a thing but yup, there
they are on the schematic and on the PC board (color code is a single
black stripe, and they do indeed measure 0 ohms).

So I'm wondering now if those resistors are in there as "placeholders" for
some value that would yield a dim function

Could be. Put a real resistor in their place. Start with 5K and see
what it does for you.

possibly even a place to
attach the wiper and one leg of a pot to provide variable dim. (Though why
they wouldn't just use wire links in place of the resistors is an
interesting question.)

I suspect that they used the zero ohm resistors rather than wire
jumpers because they could be used with automatic component insertion
equipment rather than using a hand operation in PC board assembly. You
probably don't really need to make it variable, just find a level
where you can hear and the talkback mic doesn't feed back.

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