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coroplast electrical components are varactor diodes, also known as "variable reactance diodes," which are made using the characteristic that the junction capacitance of a PN junction changes with the applied voltage when reverse-biased. As the reverse bias voltage increases, the junction capacitance decreases; conversely, the junction capacitance increases. The capacitance of a varactor diode is generally small, with a maximum value ranging from tens of pF to hundreds of pF. It is mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, for example, as a variable capacitor in the tuning circuit of a television receiver. The main parameters are: zero-bias junction capacitance, zero-bias quality factor, reverse breakdown voltage, center reverse bias voltage, nominal capacitance, capacitance variation range (in picofarads), and cutoff frequency.

coroplast electrical component classification

Thermistor materials are generally divided into three categories: semiconductor, metal, and alloy: 1. Semiconductor thermistor materials include single-crystal semiconductors, polycrystalline semiconductors, glass semiconductors, organic semiconductors, and metal oxides. They all have very large temperature coefficients of resistance and high resistivity, resulting in high sensitivity for sensors made from them. Based on the temperature coefficient of resistance, they can also be divided into negative temperature coefficient (NTC) materials and positive temperature coefficient (PTC) materials. For instance, barium titanate ceramic is an ideal PTC semiconductor material. Both types of materials are widely used in temperature measurement, temperature control, temperature compensation, switching circuits, overload protection, and time delay applications, such as in the manufacture of thermistor thermometers, thermistor switches, and thermistor delay relays. Due to the exponential relationship between resistance and temperature, the temperature measurement range is narrow and uniformity is poor. 2. Metal thermistor materials are widely used as resistance temperature detectors (RTDs), current limiters, and automatic constant-temperature heating elements. Examples include platinum resistance thermometers, nickel resistance thermometers, and copper resistance thermometers. Among these, platinum temperature sensors exhibit high precision and high stability in various media, including corrosive environments. However, their widespread application is limited by the scarcity and high cost of platinum. Copper temperature sensors are less expensive, but long-term use in corrosive media can lead to significant changes in static characteristics and resistance values. Nickel temperature sensors are widely used abroad and are considered an ideal material due to their high sensitivity, satisfactory reproducibility, and stability. 3. Alloy thermistor materials, also known as thermistor alloys. This type of alloy has high resistivity and its resistance value is sensitive to temperature changes, making it a good material for manufacturing temperature-sensitive sensors. The performance requirements for thermistor alloys as temperature-sensitive sensors are as follows: (1) sufficiently high resistivity; (2) relatively high temperature coefficient of resistance; (3) linear expansion coefficient close to that of the experimental material; (4) low strain sensitivity coefficient; (9) good repeatability of the resistance-temperature curve during heating and cooling within the operating temperature range.

coroplast electrical component principle

A crystal diode consists of a p-n junction formed by p-type semiconductor and n-type semiconductor. A space charge layer is formed on both sides of the interface, establishing a built-in electric field. When no external voltage is applied, the diode is in electrical equilibrium because the diffusion current caused by the carrier concentration difference across the p-n junction equals the drift current caused by the built-in electric field. When a forward bias voltage is applied externally, the mutual cancellation of the external electric field and the built-in electric field increases the carrier diffusion current, resulting in a forward current. When a reverse bias voltage is applied externally, the external electric field further strengthens the built-in electric field, forming a reverse saturation current that is independent of the reverse bias voltage within a certain range. When the applied reverse voltage reaches a certain level, the electric field strength in the space charge layer of the p-n junction reaches a critical value, causing carrier multiplication. This generates a large number of electron-hole pairs, resulting in a large reverse breakdown current, known as the diode breakdown phenomenon.

coroplast electrical component function

Functions of capacitors: 1. Capacitors used in coupling circuits are called coupling capacitors. This type of capacitor circuit is widely used in RC-coupled amplifiers and other capacitor-coupled circuits to block DC and pass AC signals. 2. Capacitors used in filtering circuits are called filter capacitors. This type of capacitor circuit is used in power supply filters and various filter circuits to remove signals within a specific frequency band from the total signal. 2. Capacitors used in decoupling circuits are called decoupling capacitors. This type of capacitor circuit is used in the DC voltage supply circuits of multi-stage amplifiers to eliminate harmful low-frequency coupling between amplifier stages. 3. Capacitors used in high-frequency oscillation suppression circuits are called high-frequency suppression capacitors. In audio negative feedback amplifiers, this type of capacitor circuit is adopted to eliminate potential high-frequency self-excitation and prevent high-frequency squealing in the amplifier. 4. Capacitors used in LC resonant circuits are called resonant capacitors. This type of capacitor circuit is required in both LC parallel and series resonant circuits. 5. Capacitors used in bypass circuits are called bypass capacitors. If a specific frequency band needs to be removed from the signal in a circuit, a bypass capacitor circuit can be used. Depending on the frequency of the signal to be removed, there are full-band (all AC signals) bypass capacitor circuits and high-frequency bypass capacitor circuits. 6. Capacitors used in neutralization circuits are called neutralization capacitors. This type of neutralization capacitor circuit is used in RF and IF amplifiers of radios and RF amplifiers of televisions to eliminate self-excitation. 7. Capacitors used in timing circuits are called timing capacitors. Timing capacitor circuits are used in circuits where time control is achieved through capacitor charging and discharging; the capacitor controls the magnitude of the time constant. 8. Capacitors used in integration circuits are called integrating capacitors. In the synchronization separation circuit for potential field scanning, this type of integrating capacitor circuit is used to extract the field synchronization signal from the field composite synchronization signal. 9. Capacitors used in differentiation circuits are called differentiating capacitors. In flip-flop circuits, this type of differentiating capacitor circuit is used to obtain sharp trigger pulses from various signals (mainly rectangular pulses). 10. Capacitors used in compensation circuits are called compensation capacitors. In the bass compensation circuit of a cassette deck, this type of low-frequency compensation capacitor circuit is used to boost low-frequency signals in the audio output. There are also high-frequency compensation capacitor circuits. 11. Capacitors used in bootstrap circuits are called bootstrap capacitors. The common OTL power amplifier output stage circuit uses this type of bootstrap capacitor circuit to slightly increase the amplitude of the positive half-cycle of the signal through positive feedback. 12. Capacitors used in crossover networks are called crossover capacitors. In speaker crossover circuits, crossover capacitor circuits are used to ensure that high-frequency speakers operate in the high-frequency band, mid-range speakers operate in the mid-frequency band, and low-frequency speakers operate in the low-frequency band. 13. This refers to the effective external capacitance that, together with the quartz crystal resonator, determines the load resonant frequency. Common standard values for load capacitance are 16pF, 20pF, 30pF, 50pF, and 102pF. Load capacitance can be adjusted appropriately according to specific conditions; generally, adjusting it allows the resonator's operating frequency to be tuned to the nominal value.

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