+ Post New Thread
Results 1 to 2 of 2
 29th August 2006, 06:52 #1
 Join Date
 Jul 2006
 Posts
 65
 Helped
 0 / 0
 Points
 2,073
 Level
 10
Difference between linear and logarithmic potentiometer
What is the difference between linear and logarithmic potentiometer
 29th August 2006, 06:52
 29th August 2006, 07:12 #2
 Join Date
 Oct 2004
 Location
 West Coast
 Posts
 7,942
 Helped
 2314 / 2314
 Points
 160,151
 Level
 95
Re: Difference between linear and logarithmic potentiometer
Linear potentiometers
A linear pot has a resistive element of constant crosssection, resulting in a device where the resistance between the wiper and one end terminal is proportional to the distance between them. Linear describes the electrical 'law' of the device, not the geometry of the resistive element.
Logarithmic potentiometers
A log pot has a resistive element that either 'tapers' in from one end to the other, or is made from a material whose resistivity varies from one end to the other. This results in a device where output voltage is a logarithmic (or inverse logarithmic depending on type) function of the mechanical angle of the pot.
Most (cheaper) "log" pots are actually not logarithmic, but use two regions of different, but constant, resistivity to approximate a logarithmic law. A log pot can also be simulated with a linear pot and an external resistor. True log pots are significantly more expensive.
http://en.wikipedia.org/wiki/Potentiometer
Regards,
IanP
+ Post New Thread
Please login
LinkBacks (?)

Untitled document
Refback This thread27th December 2013, 20:40