1, electricityCapacitance is calculated as: C=C1*C2/ (C1 C2) Capacitance: capacitance (Capacitance), also known as "capacitance", refers to the amount of free charge stored at a given potential difference, denoted by C, SI unit is farad (F).
2, capacitors in parallel, that is, the total capacity of each capacitor: C=C1//C2//...... Cn is C=C1 C2...... E.g. 10uf 22uf=32uf...... The voltage tolerance of the shunt capacitor is limited to the lowest voltage tolerance of the shunt capacitor.
3, the capacitance can be increased in parallelThe amount is reduced in series. The capacity is reduced after the series, but it can increase his withstand voltage value. The formula is C=C1*C2/ (C1 C2). After parallel connection, the capacity is increased, but its withstand voltage value is unchanged. The formula is: C=C1 C2 (in any case, the opposite of the resistance) series voltage of the capacitor: the total voltage is equal to the sum of the voltages of the individual capacitors.
4, capacitor series calculation formula: 1/C=1/C1 1/C2... 1/Cn; Capacitor parallel calculation formula: C=C1 C2 C3... Cn. Capacitors in series, capacity reduction (total after seriesThe calculation of capacity, refer to the parallel method of resistance), the voltage increases, the parallel capacity of the capacitor increases (the sum of the capacities), and the voltage is measured by the smallest.
5, capacitor series calculation formula: 1/C=1/C1 1/C2... +1/Cn; Capacitor parallel calculation formula: C=C1 C2 C3... +Cn. Capacitance calculation formula: A capacitor, if with 1 library of electricity when the potential difference between the two stages is 1 volt, the capacitance of this capacitor is 1 farad, that is: C=Q/U. However, the size of the capacitor is not determined by Q (charge) or U (voltage), that is, the determination of the capacitor is C. Capacitance (or capacitance, Capacitance) refers to the wireless resonant capacitance calculated is the amount of charge stored at a given potential difference; It's called C, and the SI unit is farad (F). Generally speaking, the charge will be forced to move in the electric field, when there is a medium between the conductors, it prevents the charge from moving and makes the charge accumulate on the conductor; The most common example of this is two parallel metal plates.
Inductance: When the coil passes the current, the magnetic field induction is formed in the coil, and the induction magnetic field will generate induction current to resist the passThe current through the coil. This interaction between the current and the coil is called the inductive reactance of electricity, that is, inductance. Capacitance: The ratio of the power Q carried by the capacitor to the voltage U between the two poles of the capacitor is called the capacitance of the capacitor.
Capacitance refers to the ability to hold an electric field. Any electrostatic field is composed of many capacitors, there is an electrostatic field there is a capacitor, capacitor is described by electrostatic field. Capacitance (or capacitance) is a physical quantity that represents the capacity of a capacitor to hold charge. In physics, it is a static charge storage medium, and the charge may exist permanently, which is its characteristic. Let's label it C.
The definition of inductance is L=phi/i, the unit is Weber inductance and capacitance how to understand? Inductance is a property of a closed loop and is a physical quantity. When the coil is passed through the current, a magnetic field is formed in the coilThe induced magnetic field, in turn, generates an induced current to resist the current passing through the coil. This interaction between the current and the coil is called the inductive reactance of electricity, that is, the inductance, and the unit is "Henry (H)", named after the American scientist Joseph Henry.
RLC Series resonant circuit Wireless resonant capacitance calculation The resonant frequency depends on the inductance and capacitance values Wireless resonant capacitance calculation , and has no relationship with the DC resistance of the inductance wireless resonant capacitance calculation . The deviation is large for two reasons: the precision of inductors and capacitors is usually low, and the actual value differs greatly from the nominal value. If the inductor is with a magnetic core, then, because the permeability of the magnetic core is different at different frequencies, its inductance is also different, and this gap may lead to several times or even greater changes.
Resonant frequency refers to in a circuit containing capacitors and inductors, if the capacitor and inductor are in parallel, it may appear in a small period of time: the voltage of the capacitor gradually increases, while the current gradually decreases Wireless resonant capacitance calculation ; The current of the inductor gradually increases, and the voltage of the inductor gradually decreases. In another small period of time, the voltage of the capacitor gradually decreases, while the current gradually increases; The current of the inductor gradually decreases, and the voltage of the inductor gradually increases.
In a series circuit: the imaginary part of the total input impedance is equal to zero (resonance is outputIn an AC circuit with resistance R, inductor L, and capacitor C components, the voltage at both ends of the circuit is generally different from the current phase. If the wireless charge resonant capacitance is calculated We adjust the parameters or the power supply frequency of the circuit elements (L or C), they can be in the same phase, and the entire circuit appears to be purely resistive. This state of the circuit is called resonance.
Capacitors and inductors are energy storage components in circuits, and their impact on AC circuits is particularly significant. Changing the value of the capacitance or inductance can change the resonant frequency and impedance of the circuitAnd the phase difference. Taking the filter circuit as an example, by adjusting the size of the capacitor, we can control the cut-off frequency of the filter to achieve the screening of specific frequency signals. In an oscillating circuit, the matching of capacitance and inductance determines the stability of the oscillation and the output frequency.
The circuit conditions for series resonance are: when the circuit is in series resonance, the impedance of the circuit, the total impedance in the circuit is minimum, the current will reach the maximum, the impedance condition, the virtual part after resonance is equal to the opposite sign, the series impedance is equal to 0The parallel impedance is equal to infinity, that is, when resonant, the series circuit resonance current is infinite, and the parallel circuit resonance voltage is infinite (theoretical value).
The condition of series resonance is that when the capacitive reactance XC= inductive reactance XL is equal, XC=XL, that is, series resonance occurs. The characteristics of series resonance: the circuit is pure resistance, the terminal voltage and the total current are in phase, at this time the impedance is minimum, the current is maximum, and the inductance and capacitance may produce a high voltage many times larger than the power supply voltage.
Resonant damping due to energy loss in circuit conductors and coil conductors, leakage in capacitors. Actual harmonicVibration circuits (in which resonant conditions exist) are always used with external resonant sources (generators, AC networks, radio signals).
2, the general radio FM is between 88M-108MHz, the medium wave AM is about 525KHz-1610KHz, and the short wave is about 2MHz-22MHz. The range of frequencies received by different models of radio varies greatly, with better radios receiving much wider bands. If you want to know the receiver range of a certain type of radio, it is best to search for this type of product on X Treasure yourself, and then look at the baby details, there will be instructions.
3, China has only medium wave and short wave two large band radio broadcasting. Nakato HiroshiThe frequency band used for broadcasting is roughly 550kHz-1600kHz, mainly by ground wave propagation, but also accompanied by some sky waves; Shortwave broadcasting uses a frequency band of about 2MHz-24MHz, which is mainly propagated by sky waves, accompanied by ground waves at close range. FM radio broadcasting uses ultra-short wave (very high frequency) radio waves to transmit signals, using a frequency of about 88MHz-108MHz, mainly by space waves to transmit signals.
1, T, etc., such as 5 and a half turns, the actual inductance value is unknown. Generally, diy transmitters need homemade soup coils, and coil production is provided in the form of number of turns, and the inductance value bought may not be the same as the actual need. The 6 to 10MHz transmitter coil may require more turns than 5T, and the resonant capacitance is larger than the 30pF of the C10.
2, the transmission part also uses the frequency modulation transmission ASIC MC2833 to do the front stage oscillation, C2078 to do the final stage power amplification, so thatThe debugging of the transmitter is more simple and suitable for the majority of radio enthusiasts to assemble and debug themselves. The attached figure is the electrical schematic diagram of the machine.
3, the capacity is 0.27uF, 0.3uF, and 0.33uF.
4, hello because the radio transmission principle is high-frequency oscillation → modulation → power amplification → emission, in this process not only has the main frequency, there will be secondary waves, associated waves, mirror frequency waves, etc., interference clutter, these interference clutter not only affect the transmitter, transmitted out will also affect other frequencies and frequency bands in the air, causing interference with the normal of other frequency bands. A good transmitterNot only is an LC circuit set up at the end, but a filter is also added before the power amplifier.
5, MHz and 433MHz emission frequency is determined by the acoustic surface. The resonant output part adjusts the capacitance or inductance. If the resonance is not easy to cause vibration stop.