telestar electrical components Germany telestar model telestar price

telestar electrical components are devices that convert optical signals into electrical signals. Their operating principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon where electrons in a material absorb photon energy when light strikes certain substances, resulting in corresponding electrical effects. Based on the different manifestations of the photoelectric effect, it is categorized into three types: external photoelectric effect, internal photoelectric effect, and photovoltaic effect. Photoelectric devices include phototubes, photomultiplier tubes, photoresistors, photodiodes, phototransistors, and solar cells. The performance and characteristic curves of photoelectric devices are analyzed.

telestar electrical component classification

a. By material: silicon transistors, germanium transistors. b. By structure: NPN, PNP. c. By function: switching transistors, power transistors, Darlington transistors, photosensitive transistors, etc. d. By power: low-power transistors, medium-power transistors, high-power transistors. e. By operating frequency: low-frequency transistors, high-frequency transistors, ultra-high-frequency transistors. f. By structural process: alloy transistors, planar transistors. g. By mounting method: through-hole transistors, surface-mount transistors.

telestar electrical component principle

The main principle of a diode is to utilize the unidirectional conductivity of the PN junction; adding leads and encapsulation to the PN junction forms a diode. A crystal diode consists of a PN junction formed by P-type semiconductor and N-type semiconductor, creating a space charge layer on both sides of the interface and establishing a built-in electric field. When no external voltage is applied, the diffusion current caused by the carrier concentration difference across the PN junction equals the drift current caused by the built-in electric field, resulting in an electrical equilibrium state. When a forward voltage bias is applied externally, the mutual cancellation between the external electric field and the built-in electric field increases the carrier diffusion current, causing a forward current. When a reverse voltage bias is applied externally, the external electric field and the built-in electric field are further strengthened, forming a reverse saturation current within a certain reverse voltage range that is independent of the reverse bias voltage value. When the applied reverse voltage reaches a certain level, the electric field strength in the space charge layer of the PN junction reaches a critical value, triggering a carrier multiplication process that generates a large number of electron-hole pairs, resulting in a significant reverse breakdown current, known as the diode breakdown phenomenon. Reverse breakdown of the PN junction is classified into Zener breakdown and avalanche breakdown.

telestar electrical component characteristics

(1) loudspeakers have two terminals (two leads). When a single loudspeaker is used, the two pins have no positive or negative polarity distinction; when multiple loudspeakers are used simultaneously, the two pins have polarity distinctions. (2) Loudspeakers have a paper cone, which is typically black, but can also be white. (3) Loudspeakers come in several shapes, including circular, square, and oval. (4) The back of the loudspeaker paper cone is a magnet. When touching the magnet of an external-magnet loudspeaker with a metal screwdriver, one can feel the presence of magnetism; internal-magnet loudspeakers do not exhibit this sensation, although there is indeed a magnet inside the housing. (5) Loudspeakers are mounted on machine panels or inside speaker enclosures.

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