[Harp-L] Re; Volume control issues

[Greg Heumann <greg@xxxxxxxxxxx>]

Wow -  Stephen Patrick Schneider must have been writing his post  
while I wrote mine. Excellent stuff and I agree with all of it. Thank  
you Stephen! For the record, the formula for the resistance of two  
resistors in parallel is "R1*R2/R1+R2". I also want to re-emphasize  
that, as said, crystal elements are very sensitive - make every  
effort to get the input impedance "high enough". Magnetic elements  
are not - even 100K is just fine for a volume control pot. More is  
not always better. If you use a 1M pot on a controlled magnetic  
element, the input impedance will indeed be higher but the control  
will have all of its useful range in the first 1/8 rotation of the  
knob. And because these elements are strong and stand up fine to a  
lower resistance pot, a lower value is better.

/Greg
http://www.blowsmeaway.com