Exponential encoder, linear encoder, what is the difference between the logarithmic type encoder?
How to choose?
The encoder curve (
Also some people called linear encoder)
There are many kinds of, more commonly used include A, B, C three kinds of linear encoder, for these three encoder -
Exponential encoder, linear encoder, the logarithmic type encoder, today we are going to concrete to explain their definitions.
A curve encoder for exponential and 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.
Curve B encoder for 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.
Encoder is logarithmic type C curve, 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.
Encoder type A, type B, type C is different: if the regulation requirements is not high, or can be replaced, but I still want to see the applications.
B curve for the vast majority of electronic product choice when selecting a linear, but everybody when picking curve also depends on whether their products with appropriate, if choose appropriate gm products better, such delivery all aspects will be better.
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