The role of the volume potentiometer is just to adjust the volume, the problem is much simpler. But in fact, the volume potentiometer is the only way for the signal. Its importance is often underestimated. Audio technology has always been committed to creating components with zero distortion, but in reality this is a dream. What we are after is actually the lowest degree of compromise.
The name of VR is VARIABLE RESISTOR variable resistor. The general machine is used to adjust the size of the signal. It is used for volume control, balance on the left and right, high and low knobs on the audio ... all. This component is continuous. The adjustment step (sliding type) is very poor in stability and susceptible to instability caused by temperature and humidity. Please refer to the relevant instructions of the electronic component books for other. It is slower to detect, but after a period of time, you will feel that the sound of the left and right channels will drift, and the instrument cannot be accurately positioned.After a long time, there will be noise when rotating the potentiometer. Then you will suddenly understand, and the sound is overall It will get worse and worse, some people blame the East and West, change planes, change lines, and go to the doctor in a hurry. Also in vain.
The volume potentiometer can choose general potentiometer, such as ALPS.Noble and so on. Or buy a Swiss Elma rack and add 0.1% Holco precision resistors to form a progressive potentiometer (the rich person ’s choice, this potentiometer is two thousand oceans), or make a progressive volume switch yourself. The advantage of the former is that it is easy to buy, but the sound quality of general commercial products of dozens of yuan is not very ideal, and the error of the two channels is usually not small, which seems to be inconsistent with the spirit of HI-FI; if you buy high-end products, the price is quite The high-end expensive machine is seen here, so the 24k gold plated contact switch is welded with a fixed resistance ranging from 24 to 60 segments to ensure a more stable quality. The latter is a multi-band switch (usually more than 20 bands), welding resistors with different resistances, and mimicking the action of the potentiometer.The advantage is that the error of the two channels is very small, and when using a more advanced resistor, In contrast, the better the sound quality, the disadvantage is that the multi-band band switch is not easy to buy, and the quality is good, and the price is not cheap;
There is no doubt that this type of stepping resistor is better than potentiometer. It is generally like Cello, Krell, Mark Livinson, Jadis, MBL ... and the fixed resistance of the multi-stage series switch used by my MATISSE is welded. This design can greatly reduce the size of the parallel type and can have continuous Multi-segment volume switching (generally about 20 ~ 60 segments), the use is no different from traditional cheap VR, but the sound quality is indeed difficult to compare with VR, the disadvantage is that because the series is multi-stage, so the number of fixed resistors is amazing Hundreds cannot be run away, and the error of using ultra-precision resistors should be within 1%. You can use Holco, Vishy Dale, Philips ... resistors. At the same time, the quality of SW is better, which is why this kind of stuff sells you 3 to 6,000 yuan. You can buy finished products at various fever parts shops. If you use VR that is not the general specification, you must make it yourself. The formula that can be substituted into 20 Log Av can be stepped in about 0.5 ~ 0.8dB per segment.
Robot Vacuum Cleaners With Mopping
Robot Vacuum Cleaners With Moppin,Robot Vacuum Cleaner With Bluetooth ,Robot Vacuum Cleaner With Gyroscope,Cleaner Robot Ultrasonic Cleaner
NingBo CaiNiao Intelligent Technology Co., LTD , https://www.intelligentnewbot.com