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HOMA electrical components: names for circuit boards include ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, wiring boards, PCB boards, aluminum substrate boards, high-frequency boards, thick copper boards, impedance boards, PCB, ultra-thin wiring boards, ultra-thin circuit boards, and printed (copper etching technology) circuit boards. Circuit boards miniaturize and visualize circuits, playing an important role in the mass production of fixed circuits and optimizing appliance layouts. Circuit boards may be referred to as printed wiring boards or printed circuit boards. Flexible wiring boards and flexible circuit boards are a type of highly reliable, highly flexible printed circuit board made using polyimide or polyester film as the base material. They feature high wiring density, light weight, thin profile, and good bendability.) and rigid-flex boards—the emergence and development of FPC and PCB gave rise to the new product category of rigid-flex boards. Therefore, rigid-flex boards are circuit boards formed by combining flexible wiring boards and rigid circuit boards through lamination and other processes according to relevant process requirements, resulting in a board with both FPC characteristics and PCB characteristics.

HOMA electrical component parameters

The main characteristic parameters of quartz crystal resonators include nominal frequency, adjustment tolerance, temperature tolerance, equivalent resistance, drive level, load capacitance, shunt capacitance, aging rate, and temperature range. (1) Nominal frequency is the specified center resonance frequency of the resonator under defined conditions. (2) Adjustment tolerance is the maximum deviation of the operating frequency from the nominal frequency at the reference temperature under defined conditions. (3) Temperature tolerance is the permissible deviation from the operating frequency at the reference temperature across the entire operating temperature range under defined conditions. (4) Reference temperature is the specified ambient temperature when measuring quartz crystal resonator parameters. For oven-controlled quartz crystal resonators, it is generally the midpoint of the operating temperature range; (5) Load resonance resistance is the resistance value at the load resonance frequency when the quartz crystal resonator is connected in series with a specified external capacitor. (6) Drive level refers to the effective power consumed by the quartz crystal resonator during operation; it is a measure of the excitation state applied to the quartz crystal element. In actual use, the drive level can be adjusted; strong excitation facilitates oscillation startup, while excessively weak excitation leads to poor frequency stability or even failure to oscillate. (7) Load capacitance refers to the effective external capacitance that, together with the quartz crystal resonator, determines the load resonance frequency. Load capacitance can be appropriately adjusted according to specific conditions; such adjustment generally allows tuning the resonator's operating frequency to the nominal value. (8) Shunt capacitance refers to the static capacitance between the two pins of the quartz crystal resonator. (9) Aging rate refers to the error generated by changes in the quartz crystal over time. (10) Temperature range refers to the permissible variation range of the ambient temperature during operation.

HOMA electrical component types

For different application scenarios, the purpose of using varistors varies, and the voltage/current applied to the varistor differs accordingly; therefore, the requirements for varistors also differ. Distinguishing these differences is crucial for correct usage. Based on the purpose of use, varistors can be divided into two main categories: (1) protection varistors and (2) circuit function varistors. Protection resistors: (1) Distinguish whether the varistor is for power supply protection or for signal line/data line protection, as they must meet different technical standard requirements. (2) Based on the different continuous operating voltages applied to the varistor, varistors used across power lines can be classified into AC types or DC types; varistors exhibit different aging characteristics under these two voltage stresses. (3) Based on the different abnormal overvoltage characteristics withstandable by the varistor, varistors can be classified into three types: surge suppression type, high-power type, and high-energy type. 1. Surge suppression type varistors refer to varistors used to suppress transient overvoltages such as lightning overvoltages and switching overvoltages. The occurrence of such transient overvoltages is random and non-periodic, and the peak current and voltage values can be very high. The vast majority of varistors belong to this category. 2. High-power type varistors refer to varistors used to absorb continuous pulse groups that appear periodically, such as varistors connected in parallel to switching power supply converters. Here, impulse voltages appear periodically with a known period, and the energy value can generally be calculated. Although the peak voltage is not very high, the average power is considerable due to the high frequency of occurrence. 9. High-energy type varistors refer to varistors used to absorb magnetic energy in large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the main technical indicator is energy absorption capacity. The protective function of varistors can be repeated multiple times in most application scenarios, but sometimes they are designed as "one-time" protective devices similar to current fuses. For example, varistors with short-circuit contacts connected in parallel to the loads of certain current transformers.

HOMA 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 sensor's output and input exhibit a linear relationship, then the sensitivity S is a constant. Otherwise, it will vary with changes in the input. 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 precision. However, the higher the sensitivity, the narrower the measurement range, and often the poorer the stability.

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