In the process of using adjustable potentiometers, we sometimes need to replace potentiometers. After all, the life of the parts is limited and the problems need to be replaced. But many people are not very familiar with the replacement and use of digital adjustable resistor. The manufacturer of rotary potentiometers gives you a detailed description of the specific operation steps here:

(1) Remove the original adjustable variable resistor: Remove the fixed screw on the original potentiometer with screw screwdriver. Take care not to weld down the lead on the pin of the original potentiometer so that the lead is connected to the potentiometer.
(2) Install the new adjustable potentiometer: Install the new potentiometer and fix it. A lead is welded on the pin of the original potentiometer. The lead is welded on the pin corresponding to the new potentiometer. The new and IH potentiometers are welded in contrast. Then use the same method to weld the lead wires, pay attention to avoid the misplacement between the lead wires. For the non-linear potentiometer, the pins on the two fixtures can not be misconnected with each other, otherwise the control effect of the digital adjustable resistor in the circuit will be affected.

Operating method of potentiometer

This circuit has positive and negative symmetrical power supply. For example, when the central contact C of the potentiometer slides to the potentiometer A terminal, the output voltage of OUT is + 12V, and when the central contact C of the potentiometer slides to the potentiometer B terminal, the output voltage of OUT is - 12V. Single power supply control potential, output C has a range of 0- V regulation.

This is a connection of audio amplifier for volume control. It is loud when the central contact C of the potentiometer slides to potentiometer A. It is small when the central contact C of the potentiometer slides to potentiometer B. If the contact between the central contact C and B is bad, the volume will not shut down.

In the use of adjustable variable resistor, sometimes there are some faults, don't worry, at this time we need to try to clean the adjustable potentiometer, or can help you solve the problem, then how is the adjustable potentiometer clean? See the following instructions.

1. Use the screwdriver carefully to pry open the sealing cover of the digital adjustable resistor which is a fixed card, and then remove the cover.
2. Remove the fixed spring clip of the rotating shaft and pull out the rotating shaft.
3. Some adjustable potentiometers can not remove the rotating shaft. They can wipe the carbon film and the metal contacts on the rotating shaft directly with cotton ball and pure alcohol.
4. Adjust the position and angle of metal contact, change the contact position with carbon film and increase the pressure;
5. Apply some lubricating oil or special grease on the carbon film to prolong the service life.
6. Re-install and fix the metal cover.
Such as the above is a few common methods of cleaning adjustable variable resistor, in addition, we also need to pay attention to injecting electronic cleaning liquid or alcohol into the hole of the adjustable potentiometer to rotate again, drying by hairdryer, test machine! If it is not good, it can be repeated again!