the price is  for 1 peice only

this item is DAC T Type SMD 21 Stepped Attenuator 20K ( Audio Log Type / stereo )

inside contact is golden plate

short before break Type 

Body Dia 21mm, 

Installation Dia 7mm 

thread Dia 6.5 mm, 

whole shaft length 20 mm,

shaft Dia 6 mm, 

thread length 7 mm approximate

 

 
 

We offer 10K / 20K / 50K /100K and 250K in store,

if you need others please email us. Thanks

 【3 different shaft length: 15mm， 20mm, 25mm (new) .    --------- Knurled shaft or D shape shaft are both available.  ---------with pin or without pin are both ok.】


The following measurement is a 50K potentiometer for reference









NOTE: the inside picture is old version:

now all are Nickel coating material of phosphor copper substrate

it does not make golden plated after Nickel plating anymore now


(1) in this pot, the volume increase is minimal from 0 to 10 levels, because the stepper potentiometer must be set up like this, it is different from the carbon film potentiometers, which has an infinite number of volume points.------For example, if the power of the two groups of signals is 1 milliwatt, the signal voltage of one group is 2V, another group is 20V, then the impedance of this 20V is high.

(2) --------High signal impedance means the signal voltage is high and small signal current, here should use a large K number potentiometer, if use a small K number potentiometer, the signal voltage will be pulled down a lot, which will cause distortion. 

--------Low signal impedance means low signal voltage and high signal current, here a small K potentiometer should be used, if a large K number potentiometer is used, the signal low voltage through the large K number of resistors will cause distortion. 

----------The potentiometer uses a large K number where the signal is weak, and a small K number where the signal is strong.    After replacing the potentiometer, the angle of twist and how loud the sound will be has little to do with the number of K of the potentiometer,    but has a lot to do with the voltage division ratio of the potentiometer,  and has a lot to do with type A or type B.  

--------- Conclusion is: The volume adjustment should be use A-type.

(3) If the rotation angle of a potentiometer is 300 degrees, then it is 15 degrees when it devided into 20 equal parts.  
--------Type A: The resistance value of the first few divisions does not change much as a small adjustment area, and the resistance value of each division changes with the increase of the torsion angle, so as to adapt to the perception of the equal sound of the human ear.    
---------Type B: The torsion angle is the same for each component. The 50K potentiometer is divided by 20 equal parts, and the resistance value of each equal division changes to 2.5K, and the tone is generally used, and if the volume is used, it is manifested as a small rotation of the potentiometer and the sound is loud.
--------Type C: Exactly the opposite of Type A