[sdiy] Tapped Pots?

[Louis van Dompselaar]

I have couple of centre-tapped Alpha's that have a "dead" point at the  
center tap;
same material as the outer points, splitting the resistance track in  
two.

I haven't used any of them yet, but my guess is that the usual way of  
connecting
them is to +/-Vcc with the centre tap going to ground.  That will give  
you an
accurate 0V at the centre point.


Op 3 jul 2009, om 14:38 heeft Tom Bugs het volgende geschreven:

> Hi all,
>
> I'm wondering if anyone can shed some light on pots that have an  
> extra lug for a tap point.
> I've not been able to locate any real info about - i) how the  
> resistance is 'arranged' within this setup ii) typical usage
> - have checked several datasheets and done some googling, but no  
> luck yet.
>
> The main thing that makes me look at them is for bipolar attenuators  
> -- I've used some centre-detent pots before but these tend to have  
> some slop in the middle and I generally have to use an onboard  
> trimmer to dial in the centre null point.
> Would tapped pots help?