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Application of Precision Rotating Potentiometer
Date:2019-03-21 Views:438

Precision Rotating Potentiometer Use Notes:            

1. The resistors of potentiometers are mostly made of polycarbonate synthetic resins. They should avoid contact with ammonia, other amines, alkali aqueous solutions, aromatic hydrocarbons, ketones, lipid hydrocarbons, strong chemicals (high acid-base value), etc. Otherwise, their properties will be affected.            

2. The terminal of potentiometer should avoid using water-capacitive flux when welding, otherwise it will promote metal oxidation and material mildew; avoid using low-quality flux, poor soldering may cause tin difficulty, lead to poor contact or circuit break.            

3. If the welding temperature is too high or the welding time is too long, the terminal of the potentiometer may cause damage to the rotary potentiometer. Welding of pin-type terminals should be completed in 235 +5 C within 3 seconds. Welding should be over 1.5MM of the potentiometer body. No solder should be used to flow through the circuit board during welding. Welding of wire-type terminals should be completed in 350 +10 C within 3 seconds. And the terminal should avoid heavy pressure, otherwise it is easy to cause bad contact.    

        

4. When welding, the height of rosin (flux) entering the printing press plate should be adjusted properly, so flux should be avoided from intruding into the potentiometer. Otherwise, it will cause bad contact between brushes and resistors, resulting in INT and bad noise.            

5. Rotating potentiometer is best used in voltage adjustment structure, and the connection mode should be "1" foot grounding; current adjustment structure should be avoided, because the contact resistance between resistance and contact plate is not conducive to the passage of large current.            

6. The surface of rotary potentiometer should avoid condensation or water droplets, avoid using in wet places to prevent insulation deterioration or short circuit.            

7. When installing the "rotary" potentiometer to fix nuts, the strength should not be too tight to avoid destroying the screw teeth or poor rotation; when installing the "iron shell direct sliding" potentiometer, avoid using too long screw, otherwise it may hinder the movement of the sliding handle, or even directly damage the rotary potentiometer itself.           

 8. In the process of putting knob on potentiometer sleeve, the thrust force used should not be too large (not exceeding the parameters of the pulling force of the axis in the Specification), otherwise it may cause damage to potentiometer.  

9. The rotary operation force (rotation or sliding) of potentiometer will become lighter with the increase of temperature and tighter with the decrease of temperature. If the potentiometer is used in low temperature environment, it should be explained in order to use special low temperature resistant grease. 

10. The shorter the axis or sliding handle of potentiometer is, the better. The shorter the length of the shaft or sliding handle, the better and more stable the hand feel. On the contrary, the longer the shaking, the greater the change of hand feel.

11. The power of the potentiometer carbon film can withstand the ambient temperature of 70 C. When the temperature is higher than 70 C, it may lose its power.


Selection of Rotating Potentiometer:

First of all, you have to determine how much the output current is, if the current is relatively small, such as less than 10 mA, then you can use a general carbon film potentiometer. If the required output current is relatively large, the power of the potentiometer must be calculated by the formula P = ui. If your output current is 300 mA, the required power of the potentiometer is 7.2 W, choose 10W/10K. Generally, the maximum power of rotating potentiometer can reach 100W. It can be selected according to actual needs, and a certain power margin should be left when selecting.