General capacitance in 1 p to 1000 p, choose according to filter frequency calculation of capacitance, filter types too much common ∏ type, R type, T.
Uf and uf electrolytic capacitor
capacity from 1 to 10000 large capacity, according to the different requirements of circuit to choose, but they all have one thing in common between them is pressure values in different circuit, selected according to the working voltage of the high and low.
Comprehensive the above features are both are essentially different, cannot confuse STH with STH else.
C1 is a 1000 mu F large capacity filter capacitor, C2 is a only 0.
In theory, at the same frequency capacitance of its small capacitive reactance, large capacity under such a big capacity after a two capacitors in parallel younger small capacitance C2 is not effective.
However, due to the large capacity capacitance impedance characteristics (
Instead, it under the condition of high frequency impedance is greater than that of low frequency capacitive reactance.
When high working frequency of the circuit, small capacitance C2 capacitive reactance is very small, so that high frequency interference signal is through a small capacitance C2 filter to the ground.
This circuit, the rectifier circuit output for the vast majority of the dc voltage is one-way pulsation frequency low communication components, components for these communication small capacitance does not work,
When is mainly large capacitance Cl in work, through the Cl is low frequency ac component.
For high frequency components, the frequency is higher, large capacitor C1 in the open circuit state rather than work, small capacitance C2 capacitive reactance is far less than the impedance of C1 and is in working status, is used to filter out all kinds of high frequency interference signals, so through the C2 is high frequency components.
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