DOSPEL electrical components Germany DOSPEL model DOSPEL price

DOSPEL electrical components refer to electronic components that generate resonant frequencies, commonly divided into quartz crystal resonators and ceramic resonators. They function to generate frequencies and feature stability and good anti-interference performance, making them widely used in various electronic products. The frequency accuracy of quartz crystal resonators is higher than that of ceramic resonators, but the cost is also higher. Resonators mainly serve the role of frequency control; all electronic products involving frequency transmission and reception require resonators. Resonator types can be divided into through-hole and surface-mount types based on their form factor.

DOSPEL electrical component classification

Based on structural differences, they are classified into full-availability trunks, partial-availability trunks, and link systems; based on service modes, they are classified into loss-system trunks and waiting-system trunks (see stochastic service systems); based on the number of traffic sources served, they are classified into infinite-source trunks and finite-source trunks. In telecommunication systems, equipment directly used for communication between users is mostly an infinite-source loss-system full-availability link system, while equipment used to control the connection process of communication devices is mostly an infinite-source waiting-system full-availability system. When the number of traffic sources is not very large relative to the trunk capacity, a finite-source full-availability system or partial-availability system is generally adopted. Based on the call behavior of traffic sources, i.e., whether users make new call attempts after a call failure, trunks can be divided into repeated-call systems and non-repeated-call systems. Actual communication systems all have repeated calls; non-repeated-call systems are an approximation of repeated-call systems. ① Full-availability trunks. If any service device (trunk line or selector) in the trunk can be used by any traffic source in the group of traffic sources it serves, such a trunk is called a full-availability trunk. ② Partial-availability trunks. If any traffic source in the traffic source group can only use part of the service devices in the trunk, such a trunk is called a partial-availability trunk. Partial-availability trunks divide the traffic source group into several subgroups, performing grading and multiple connections between the outlets of the traffic groups. This structure can be described by the example shown in the figure below.

DOSPEL electrical component principle

Electrodynamic loudspeakers, also known as moving-coil loudspeakers, are electroacoustic transducers applying the electrodynamic principle. They are the most frequently and widely used loudspeakers, primarily for three reasons: 1. Electrodynamic loudspeakers have a simple structure and are easy to manufacture. They do not require significant space, resulting in low prices and widespread adoption. 2. These loudspeakers can achieve excellent performance, obtaining a uniform frequency response in the mid-frequency range. 3. These loudspeakers are continuously improving. Decades of loudspeaker development history represent a history of continuous improvement in design, craftsmanship, and materials, as well as a history of performance keeping pace with the times. The shapes of electrodynamic loudspeakers are mostly conical or dome-shaped. The structure of a conical loudspeaker can be divided into three parts: 1. The vibration system includes the diaphragm, voice coil, spider, and dust cap. 2. The magnetic circuit system includes the upper pole plate, pole piece, lower pole plate, and magnet. 4. The auxiliary system includes the basket, surround, terminal board, and phase plug. According to Faraday's law, when a current-carrying conductor passes through a magnetic field, it experiences an electromagnetic force. Its direction conforms to Fleming's left-hand rule, with the force perpendicular to both the current and the magnetic field directions. The magnitude of the force is proportional to the current, wire length, and magnetic flux density. When an alternating audio current is input to the voice coil, the voice coil experiences an alternating driving force, generating alternating motion. This drives the paper cone to vibrate, repeatedly pushing air to produce sound.

DOSPEL electrical component classification

Classification by application: toggle switches, band switches, record/playback switches, power switches, selector switches, limit switches, control switches, changeover switches, isolating switches, travel switches, wall switches, intelligent fire protection switches, etc. Classification by structure: micro switches, rocker switches, toggle switches, slide switches, push-button switches, keypad switches, as well as fashionable thin-film switches and dot switches. Classification by contact type: Switches can be divided into a type contacts, b type contacts, and c type contacts based on contact type. Contact type refers to the relationship between the operating condition (switch pressed) and the contact state (contact closed). Suitable contact types must be selected based on the application. Classification by switch count: single-control switches, dual-control switches, multi-control switches, dimmer switches, speed control switches, splash-proof boxes, doorbell switches, sensor switches, touch switches, remote control switches, smart switches, card-operated power switches, and bathroom heater dedicated switches.

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