A504 500K 4-Pin Potentiometer

 

4-pin logarithmic potentiometer with 500K Ohm resistance value.

 

Logarithmic potentiometers are very popular, basically, types of non-linear or non-proportional potentiometers whose resistance varies logarithmically. Logarithmic or “log” potentiometers are commonly used as volume and gain controls in audio applications where attenuation varies as a logarithmic ratio in decibels. This is because the sensitivity of the human ear to sound levels has a logarithmic response and is therefore non-linear.