Exponential encoder, logarithmic type encoder, linear encoder
Encoder according to the resistance value can be divided into linear encoder, the change rule of exponential encoder and logarithmic type encoder.
For the definition of the three encoder and change rule, please see the following article to share, understand, we would not have chosen the wrong when choose encoder.
When we get the adjustable resistance or encoder, often see a B20K A100K, C50K this tag, the tag is refers to the resistance and linear encoder.
A, B, C is refers to the different 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 can be any functional form in theory, but the resistance of common encoder linear type has linear change [
Type, index change [
Type, logarithm change [
B: linear encoder conductive material on its resistance to uniform distribution, the resistance of unit length roughly equal, the rotation Angle encoder with the change of resistance in a straight line relationship, pressure for more point;
Resistance according to the uniform rotation Angle change, suitable for partial pressure, monotonous, etc.
More commonly used by linear encoder is this.
Type A exponential encoder, exponential (
Inversion of logarithmic type)
Encoder,, at the beginning of the rotational resistance changes a lot.
In the corner, the more resistance to the end, the smaller the resistance changes.
Inversion of logarithmic type)
Encoder, resistance according to the relation of rotation Angle according to the index, widely used in the volume control circuit such as radios, tape recorders, TV sets in the volume controller.
Because of the strength of the hearing the sound, is in accordance with the relationship between index change, if the volume change with resistance tolerance index modulation, so that the human ear hears voice it feels smooth and comfortable.
So this kind of encoder is suitable for the audio tone control circuit of the circuit.
C logarithmic type encoder, logarithmic type encoder, at the beginning of the rotational resistance to change is small, but in the corner, the more resistance to the end, the greater the resistance changes.
Resistance according to the rotation Angle according to the logarithmic relationship changes, use this type of encoder in instrument applies to the tone control circuit, the encoder in resistance on the uneven distribution of conductive material, started turning as resistance varies widely;
Small rotation Angle increases, the resistance of the change.
Rotation Angle of the change of resistance with encoder several relations in pairs, more for the volume control.
Because the human ear's sense of the volume and sound power of a linear relationship with logarithm roughly, namely sound increase since childhood, is sensitive to the human ear, but to a certain value, even if the sound power have greatly increased, but feel a little change to the human ear.
Visible resistance change law of logarithmic type encoder more conform to the human ear hearing characteristics, so in radio, TV and so on the volume control circuit, should choose the logarithmic type encoder.
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