Custom Silver Electronic Organ Control Rotary Knob Bass Amplifier Volume Control Knob

Experts who have been in the audio industry for a long time, when they operate various power amplifier equipment, I don’t know if you have such a question: no matter whether the size of the equipment is huge or small, more than 90% of the equipment’s volume knob They all appear on it in a huge proportion. The protagonist of the entire device is the volume knob. Why do they have to make it so big? There must be a reason for everything. Today, I will talk to you about this inconspicuous volume silver fader control knobs that plays a fundamental role.

What does the volume control do?

Volume control is level transmission. Its function is to control the strength (size) of the signal, so that the output volume is easy to listen to. Generally, there are smooth and step types. It is controlled coaxially by a Potentiometer control knob, while most professional devices prefer a volume knob to control the volume of a single channel. Occasionally we can also see some potentiometers adopt a two-way coaxial design, and can also control two independently. channel volume.

We mentioned before that the hardware essence of the volume knob is a potentiometer. Its function is not to expand the signal as the novices understand it, but to attenuate the level signal. A potentiometer is an adjustable electronic component consisting of a resistive body and a rotating or sliding system. The potentiometers used in the frequency conversion speed regulation are all handle rotation speed regulation. The volume of common potentiometers is very small (some high-level and very high-precision potentiometers will be very large), but the cover that is often placed on it, that is, the volume 100k potentiometer with knob we usually say is very large, why is it in When everyone is pursuing simplicity and compactness, why does this thing have to do the opposite?

Why are the volume buttons so big?

Because these types of potentiometers use blue shells, they are also often referred to as "Alps blue shell potentiometers". Most of the entry-level equipment will use blue-shell potentiometers. Manufacturers think that they value the quality of potentiometers, which is quite good. Therefore, Chang Ai writes the use of Alps blue-shell potentiometers in the publicity copy.

Of course, there are also some manufacturers who actually make equipment that sound bad, but they also love to use this blue-shell potentiometer, so as to fool the novice into taking it as a high-quality product. You can't ignore it.

Alps also has top-level carbon film potentiometers RK40/50 series, which are specially designed for high-end audio. Of course, RK40/50 audio equipment can be used, and it has undoubtedly entered the ranks of mid-to-high-end Hi-Fi.

But what potentiometer does the Hi-End top equipment use? ——Finally here——The real powerful potentiometer is the stepper potentiometer.

What is a stepper potentiometer?

It does not slide on a whole piece of resistive film, but divides the resistance value into several levels, each level is welded with an independent resistance (the resistance values ​​used by the left and right channels are strictly matched), and then the silver contacts are used to connect them step by step. The resistance value of each stage is fixed.

The stepping potentiometer will never cause noise due to the falling off of the resistive film, nor will the volume of the left and right channels be inconsistent due to wear and aging, so it is the most reliable mechanical potentiometer for audio equipment.

In terms of volume adjustment, the shape of the rotary button is more exaggerated, but some portable devices do not use volume potentiometers or professional volume chips. Compared with the adjustment by changing the size of the resistance, the attenuation of the DAC is chosen to achieve this. It saves more money, saves PCB, and reduces the difficulty of wiring design. However, such a design is a test of the circuit engineer's mileage. If the design is not fully considered, it may cause greater drawbacks, especially if the electrical interference factors are not fully considered or done in detail, it will reduce the working stability of the DAC. To put it bluntly, it affects performance.

To sum up

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