Exponential encoder, logarithmic type encoder, linear encoder type resistance changes
Encoder according to the resistance change law can be divided into exponential encoder, linear logarithmic type encoder, linear encoder.
Rotation Angle encoder resistance linear refers to the encoder (
And used as a divider when the relationship between the output voltage.
Rotary encoder of the resistance with the slide contact Angle and the changes of the division of this relationship in theory can be any functional form.
Resistance changes characteristic of the encoder is refers to the resistance value of the encoder with the activities of the length of the moving contact or axis of rotation Angle change, the relationship between the resistance characteristics of output function.
There are three commonly used: 1)
Exponential encoder resistance changes characteristics of exponential encoder to a change in the resistance changes with the moving contact position index.
Exponential encoder in resistance due to the uneven distribution of conductive material, encoder start turns, resistance changes slowly, the rotation Angle to travel during the second half, the resistance changes quickly.
Exponential encoder is suitable for the volume control circuit, because the person is the most acute hearing ear of the loudness of a sound, when volume reaches a certain degree, the gradual change of the auditory dull.
So, adjust the volume generally adopts the exponential encoder, make the change of sound appears smooth and comfortable.
Logarithmic type encoder resistance characteristics of logarithmic type encoder resistance changes with the change of the moving contact position several relations in pairs.
Logarithmic type encoder on the resistance due to the conductive material distribution is not uniform, the encoder start turns, resistance changes quickly, the rotation Angle to travel during the second half, the resistance changes slowly.
Logarithmic type encoder is suitable for the requirements and exponential encoder instead of electronic circuit, such as the contrast of the television control circuit, tone control circuit.
Linear type resistance changes characteristic of linear encoder type encoder resistance changes with a linear relationship with the change of the moving contact position.
Linear type encoder in resistance on conductive material uniform distribution, resistance per unit length is roughly equal.
It is suitable for regulation uniform required (
Such as voltage divider)
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