When we choose the encoder will be asked to select resistance and linear encoder, some customers friends is not very clear about the concept of linear encoder resistance in this paper, to tell you about linear relation and the change, in order to help you understand this concept.
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.
Common type encoder linear supplying a logarithm change [
Type, linear change [
Type, index change [
Electronic resistance to concrete analysis about the three encoder linear change, specific content is as follows: C is logarithmic type, 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.
Type B for linear, 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 is exponential, 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.
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Value k - 1
1000 k and all kinds of linear)
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