Specification

Package   Knobs are packed into blister trays separately, which will not be damaged during transportation.

Product Features   Material: rotary knobs were made of aluminum, support customize to brass, stainless steel, steel, and other materials.   Size: knobs are made by precision machines, all sizes are supported customization, no need for extra mold cost.    Shaft hole: fit for smooth shaft, spline/teeth shaft, and D shaft/Half shaft as below:

The knob isn't a world-changing invention, but it can do what buttons can't.

As a mechanical structure, it is impossible to test which device the knob first appeared on. Maybe a telegraph from the last century? Or an oscilloscope recorder? It may also be a radio or a TV later. Like many buttons, it was naturally born on electronic devices, and then gradually became popular and became part of the electronic instrument panel, and has been used as a controller to this day.

The knob itself is very delicate. Unlike pressing a switch, which can only output one quantitative value, the knob may correspond to several quantitative values or a limited range such as "0-10". For example, the common volume knob will allow the user to arbitrarily adjust within a certain range of values, and the desired volume can be obtained with a slight turn, which cannot be achieved by pressing the up and down buttons all the time.

Because of this feature, when you turn the knob to adjust the volume, you don't look carefully at the scale information above (some even don't have a scale), maybe you don't care about the size of the numbers at all, but use both ears to "find" a sound that is just right.

A similar experience can also be felt from a desk lamp. We adjust the brightness by rotating, but in fact, we rely on our eyes to find the right light source, rather than focusing on a specific digital scale or color temperature range.

This is the immersive experience brought by the knob, which can make people focus on the information itself. In other words, under this continuous control, we will naturally produce this intuitive behavior, because our ears and eyes have responded to the results in advance.

But even with such an exquisite design, knobs have rarely appeared on products such as mobile phones or computers. Not to mention the common equipment now, smartphones and laptops, we basically can't see the knob. Even in an era before touchscreens became standard, knobs were not the preferred interaction solution for most products.

But the knob has not completely disappeared. You can still see it in some specific places, such as the ECG monitor in the hospital, or the mixer in the school broadcast room. Such professional instruments are still indispensable. Controllers of all sizes; and some consumer electronics products also recognize the intuitive, out-of-the-box nature behind the knob, so it also exists as an auxiliary interaction solution.

If the digital and graphical controllers pursue unity and efficiency, then the retention of knobs and the like maybe our original unconscious cognition of this mode of operation.