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3SU1401-1BB50-3AA0 electrical component is an active-matrix liquid crystal display driven by thin-film transistors. It primarily uses current to stimulate liquid crystal molecules to generate points, lines, and planes, which combine with backlights to form images. IPS, TFT, and SLCD are all subclasses of LCD. Its operating principle is that, under the action of an electric field, the alignment direction of liquid crystal molecules changes, altering the transmittance (modulation) of external light sources to complete electro-optical conversion. Then, using different excitations of the R, G, and B primary color signals, it completes color reproduction in the time and spatial domains through red, green, and blue primary color filter films.

3SU1401-1BB50-3AA0 electrical component principle

Microphones have evolved from initial resistive acoustic-to-electrical conversion to inductive and capacitive conversion. Many new microphone technologies have gradually developed, including aluminum ribbon moving-coil microphones, as well as the currently widely used condenser microphones and electret microphones. The working principle of a moving-coil microphone is that human voice causes the diaphragm to vibrate through air, and then the electromagnetic coil winding on the diaphragm cuts the magnetic field formed by the magnet surrounding the moving-coil head, generating a weak fluctuating current. The current is transmitted to the loudspeaker, which converts the fluctuating current back into sound through the reverse process. For ribbon microphones, the aluminum ribbon serves as both the microphone diaphragm and the conductor moving in the magnetic field. The ribbon is usually made of aluminum foil. To achieve an ideal resonance frequency, the ribbon is corrugated to maintain a precise tension value. The ribbon, acting as both conductor and diaphragm, is suspended in the magnetic field between two magnetic poles, vibrating with the frequency of incident sound waves and generating a certain voltage output at both ends of the ribbon. A condenser microphone has two metal plates, one of which is coated with an electret film and grounded, while the other plate is connected to the gate of a field-effect transistor. A diode is connected between the gate and the source. The diaphragm of a condenser microphone is mostly made of fluorinated ethylene propylene, which has good humidity performance, generates more surface charge, and is less affected by humidity. Since this transducer also has a capacitive structure with high internal signal resistance, its output end must also use a field-effect transistor to extract and amplify the voltage signal generated by sound.

3SU1401-1BB50-3AA0 electrical component function

The main function of ferrite beads is to eliminate RF noise existing in transmission line structures (circuits). RF energy is the AC sinusoidal component superimposed on the DC transmission level, where the DC component is the required useful signal. To eliminate these unwanted signal energies, chip ferrite beads act as high-frequency resistors (attenuators). Ferrite beads have high resistivity and permeability; they are equivalent to a resistor and an inductor in series, but both resistance and inductance values vary with frequency. They have better high-frequency filtering characteristics than ordinary inductors, presenting resistive behavior at high frequencies, thus maintaining high impedance over a relatively wide frequency range to improve FM filtering effects. Inductors can be used for power supply filtering. The circuit symbol for a ferrite bead is that of an inductor, but the model number indicates it is a ferrite bead. In terms of circuit function, ferrite beads and inductors operate on the same principle, differing only in frequency characteristics. The DC component is the required useful signal, while RF RF energy is useless electromagnetic interference transmitting and radiating along the line. To eliminate these unwanted signal energies, chip ferrite beads act as high-frequency resistors (attenuators), allowing DC signals to pass while filtering out AC signals. Ferrite beads have high resistivity and permeability, equivalent to a resistor and an inductor in series. In the circuit, the wire simply passes through it. High-frequency current dissipates as heat within it; its equivalent circuit is an inductor and a resistor in series, with the values of both components proportional to the length of the ferrite bead. Some ferrite beads have multiple holes; passing the wire through them increases component impedance (proportional to the square of the number of times the wire passes through the bead). Ferrite beads can not only be used in power circuits to filter high-frequency noise (suitable for DC and AC outputs) but are also widely used in other circuits.

3SU1401-1BB50-3AA0 electrical component characteristics

Under normal circumstances, the actual static characteristic output of a sensor is a curve rather than a straight line. In practical work, to enable instruments to have uniformly scaled readings, a fitted straight line is often used to approximately represent the actual characteristic curve. Linearity (non-linear error) is a performance indicator of this degree of approximation. There are various methods for selecting the fitted straight line. For example, the theoretical straight line connecting the zero input and full-scale output points can be used as the fitted line; or the theoretical straight line with the minimum sum of squared deviations from each point on the characteristic curve can be used as the fitted line, known as the least squares fitted line.

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