schreier electrical components Germany schreier model schreier price

schreier electrical components are a new type of contactless switching device composed entirely of solid-state electronic components. It utilizes the switching characteristics of electronic components (such as switching transistors, triacs, and other semiconductor devices) to achieve contactless and spark-free circuit connection and disconnection, hence it is also known as a "contactless switch." A solid-state relay is a four-terminal active device, where two terminals are input control terminals and the other two are output controlled terminals. It has both amplification drive and isolation functions, making it very suitable for driving high-power switching actuators. Compared to electromagnetic relays, it offers higher reliability, is contactless, has a long service life, fast speed, and low external interference, and has been widely used [1].

schreier electrical components applications

Dedicated solid-state relays can feature short-circuit protection, overload protection, and overheat protection. When combined with hardwired combinational logic packaging, they can form intelligent modules tailored to user requirements for direct use in control systems. Solid-state relays are widely used in computer peripheral interface equipment, constant temperature systems, temperature regulation, electric furnace heating control, motor control, numerical control machinery, remote control systems, and industrial automation devices; signal lights, dimming, flashers, and stage lighting control systems; instruments and meters, medical devices, copiers, and automatic washing machines; automatic fire fighting and security systems, as well as switching switches for power capacitors used in grid power factor compensation. Additionally, they are extensively used in chemical, coal mining, and other environments requiring explosion-proof, moisture-proof, and corrosion-resistant properties.

schreier electrical components principle

The Hall voltage changes with the magnetic field strength; the stronger the magnetic field, the higher the voltage, and the weaker the magnetic field, the lower the voltage. The Hall voltage value is very small, typically only a few millivolts, but after amplification by an amplifier in an integrated circuit, the voltage can be amplified enough to output a stronger signal. To make the Hall integrated circuit act as a sensor, mechanical methods are needed to change the magnetic field strength. Using a rotating impeller as a switch to control magnetic flux, when the impeller blades are in the air gap between the magnet and the Hall integrated circuit, the magnetic field deviates from the integrated chip, and the Hall voltage disappears. Thus, the change in the output voltage of the Hall integrated circuit can indicate a certain position of the impeller drive shaft. Utilizing this working principle, the Hall integrated circuit chip can be used as an ignition timing sensor. Hall effect sensors belong to passive sensors; they require an external power supply to work, which allows them to detect low-speed operation conditions.

schreier electrical components structure

Common electrodynamic cone paper loudspeakers. Electrodynamic cone loudspeakers, formerly known as paper cone loudspeakers, although the diaphragm is still mainly made of paper cone, many polymer material diaphragms and metal diaphragms have appeared, so calling them cone loudspeakers is more accurate. Cone paper loudspeakers generally consist of three main parts: the magnetic circuit system (permanent magnet, core pillar, magnetic plate), the vibration system (paper cone, voice coil), and the support auxiliary system (centering spider, basket, surround). 1. Voice coil: The voice coil is the drive unit of the cone paper loudspeaker. It is made of very fine copper wire wound in two layers on a paper tube, usually with dozens of turns, also known as a coil, placed in the magnetic gap formed by the magnetic core pillar and the magnetic plate. The voice coil is fixed to the paper cone. When an audio current signal is passed through the voice coil, the voice coil vibrates, driving the paper cone to vibrate. 2. Paper cone: There are many types of materials used for the conical diaphragm of cone paper loudspeakers, generally divided into natural fibers and synthetic fibers. Natural fibers often include cotton, wood, wool, silk, etc., while synthetic fibers include rayon, nylon, fiberglass, etc. Since the paper cone is the sound radiation component of the loudspeaker, it largely determines the sound performance of the loudspeaker. Therefore, regardless of the type of paper cone, it must be lightweight and have good rigidity, and should not deform due to changes in environmental temperature and humidity. 3. Surround: The surround is designed to ensure the paper cone moves along the axial direction of the loudspeaker and restricts lateral movement, while also preventing the flow of air between the front and back of the paper cone. In addition to the materials commonly used for paper cones, the surround materials also include plastics and natural rubber, which are thermally bonded to the paper cone. 5. Centering spider: The centering spider supports the joint area of the voice coil and the paper cone, ensuring it remains vertical and not tilted. The centering spider has many concentric rings, allowing the voice coil to move freely up and down in the magnetic gap without lateral movement, ensuring the voice coil does not touch the magnetic plate. The dust cap on the centering spider prevents external dust from falling into the magnetic gap, avoiding friction between dust and the voice coil, which could cause abnormal sounds in the loudspeaker. Generally, a loudspeaker consists of: a magnet, frame, centering spider, molded surround, and cone paper cone.

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