[volt-nuts] Update on 720A

[Chuck Harris]

Ah, ok.  I went for a quick look through the
manual, and couldn't find it...

It could always be replaced with a concentric shaft
pot that has two appropriate sections wired in series.

That would lose the "nifty" factor, though.

-Chuck

David C. Partridge wrote:
>> The bridge balance pot may not be so lucky, though.  I don't think it needs to be anything very special.
> 
> As far as I can tell it is a very special pot wired with two resistance tracks.  The coarse track has with two wipers connecting to the fine track which has just one wiper, all driven by a clever mechanism to provide both coarse and fine adjustments with only one shaft.
> 
> In line art like this:
> 
> ----
>    x
>    x
>    x<-----
>    x      x
>    x      x<---
>    x      x
>    x<-----
>    x
>    x
> ----
> 
> Dave
> 
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