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Old 10th January 2007, 02:46 AM   #1
SY847 is offline SY847  United States
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Default Question about potentiometers

Hey,

I was wondering if it was possible to put a potentiometer in parallel with the signal input instead of in series with the signal line. would the pot still atenuate correctly?

thanks
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Old 10th January 2007, 08:29 AM   #2
Elvee is offline Elvee  Belgium
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Default Re: Question about potentiometers

Quote:
Originally posted by SY847
Hey,

I was wondering if it was possible to put a potentiometer in parallel with the signal input instead of in series with the signal line. would the pot still atenuate correctly?

thanks
Basically, it will depend on the source impedance; if this impedance is sufficiently large, a variation will occur, but on active outputs, this will generally not work properly, as the impedance is very low, and the output circuit will not like being shorted when the volume setting is zero. This arrangement is often used on electric guitars, but even with passive sources there can be problems: in general, the impedance won't simply be resistive, which means the variation will also affect the frequency response.
Also note that potentiometers, are not simply put in series but in a potentiometric (surprise!) arrangement allowing for ~infinite attenuations.
LV
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