[sdiy] RE: cross-fades (was ...)

[Neil Johnson]

Hi,

Ingo Debus <igg.debus at t-online.de> wrote: 
> 
> Am 15.01.2009 um 23:58 schrieb mark verbos:
> 
> >> Passive approach requires a ganged pot.
> >>
> >
> > or run both signals through resistors and after them have a single  
> > pot with it's ends on the signals, post resistor and wiper to  
> > ground. After this section, the two signals can be passively  
> > combined with 2 resistors. It would help to combine them with an  
> > opamp stage.
> 
> Can't you just feed the two signals into either ends of a pot and  
> grab the result from the wiper?

This only works if the two source impedances are zero.  Otherwise you'll never completely select one or the other source at the ends of pot travel.

Neil
--
http://www.njohnson.co.uk