yamaha electrical components Germany yamaha model yamaha price

yamaha electrical components utilize the good conductivity and fluidity of mercury to control the opening and closing of electrical circuits. They consist of a glass tube, mercury, fixed electrodes, lead wires, etc. After evacuating the air from the tube, it is filled with various gases and sealed. It is suitable for environments with dust, oil, water vapor, and corrosive gases, and can also be used as an explosion-proof switch in places with explosive gases. Given the high surface tension and specific gravity of the mercury inside the tube, along with its fluidity, the position of the mercury changes immediately with even a slight tilt of the glass tube, and makes contact with the electrodes via surface contact, thus enabling the switching of high AC and DC currents. Additionally, this type of switch features a lifespan of several million cycles at rated current, small size, high sensitivity, no mechanical noise, and low cost, making it commonly used as a switch for automatic control.

yamaha electrical component characteristics

Sensitivity refers to the ratio of the change in output to the change in input of a sensor under steady-state operating conditions. It is the slope of the output-input characteristic curve. If the relationship between the sensor's output and input is linear, then the sensitivity S is a constant. Otherwise, it will vary with changes in the input quantity. The dimension of sensitivity is the ratio of the dimensions of the output and input quantities. When the dimensions of the sensor's output and input quantities are the same, sensitivity can be understood as the amplification factor. Increasing sensitivity yields higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range, and stability often deteriorates.

yamaha electrical component types

Commonly used thermocouples can be divided into two main categories: standard thermocouples and non-standard thermocouples. Standard thermocouples refer to those for which national standards specify the relationship between thermoelectric potential and temperature, permissible errors, and have a unified standard indexing table; matching display instruments are available for selection. Non-standardized thermocouples are inferior to standardized thermocouples in terms of usage range or magnitude, generally lack a unified indexing table, and are mainly used for measurements in certain special occasions. Theoretically, any two different conductors (or semiconductors) can be configured into a thermocouple, but as a practical temperature-measuring element, it faces multifaceted requirements. To ensure reliability in engineering technology and sufficient measurement accuracy, not all materials can form thermocouples. The basic requirements for thermocouple electrode materials are generally: 1, stable thermoelectric properties within the temperature measurement range, not changing over time, sufficient physical and chemical stability, and resistance to oxidation or corrosion; 2, small temperature coefficient of resistance, high electrical conductivity, and low specific heat; 3, large thermoelectric potential generated during temperature measurement, with a linear or nearly linear single-valued functional relationship between thermoelectric potential and temperature; 8, good material reproducibility, high mechanical strength, simple manufacturing process, and low price.

yamaha electrical component principle

P-type semiconductor is formed by doping a small amount of trivalent impurity elements, such as boron, into an intrinsic semiconductor (a completely pure, structurally perfect semiconductor crystal). Since a boron atom has only three valence electrons, it forms covalent bonds with surrounding silicon atoms. Due to the lack of one electron, a vacancy is created in the crystal. When electrons on adjacent covalent bonds gain energy, they may fill this vacancy, turning the boron atom into an immobile negative ion, while the covalent bond of the original silicon atom forms a hole due to the missing electron, but the entire semiconductor remains neutral. In this P-type semiconductor, conduction is primarily via holes; holes are the majority carriers, and free electrons are the minority carriers. The principle of formation for N-type semiconductors is similar to that of P-type. Pentavalent atoms, such as phosphorus, are doped into the intrinsic semiconductor. After doping, they form covalent bonds with silicon atoms, generating free electrons. In N-type semiconductors, electrons are the majority carriers, and holes are the minority carriers. Therefore, by doping trivalent and pentavalent impurity elements into two different regions of an intrinsic semiconductor, P-type and N-type regions are formed. Based on the characteristics of N-type and P-type semiconductors, a concentration difference of electrons and holes appears at their junction. Both electrons and holes diffuse from regions of high concentration to regions of low concentration. This diffusion disrupts the electrical neutrality at the original junction. PN junction unidirectional conductivity: When a forward voltage V is applied externally to the PN junction, the equilibrium state of the PN junction is broken under the influence of this external electric field. Holes in the P region and electrons in the N region both move towards the PN junction. Holes neutralize the negative ions in the P region of the PN junction, and electrons neutralize the positive ions in the N region of the PN junction, thereby narrowing the PN junction. As the external electric field increases, diffusion motion further intensifies, while drift motion weakens. When the external voltage exceeds the threshold voltage, the PN junction acts as a resistor with very low resistance, meaning the PN junction is conducting.

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