On the condenser pressure value explanation, said the capacity of the capacitor?

Marked on capacitor & other; 25 v” Refers to the pressure value of the capacitance is 25 v. That is to say, the capacitance when use, add on both ends of the voltage cannot be more than 25 v, otherwise, the capacitance will be breakdown ( Breakdown of insulators atomic structure destroyed, insulators become conductor) Damage. For general nonpolar or tantalum capacitor, once the breakdown, the capacitance will be permanent damage. For aluminum electrolytic capacitors, if add on both ends of the capacitor voltage is not significantly higher than the breakdown voltage, then the aluminum electrolytic capacitor also have self-healing function. When coupled with the high voltage is removed, the aluminum electrolytic capacitor can also be back to normal.

in choosing capacitance pressure value, the general requirements of capacitive pressure value is greater than 1 highest on both ends of the capacitor voltage. 2 to 1. 5 times. For example, using LM7812 connect a 12 v regulated power supply, the output terminal filter capacitance should choose pressure value is at least 16 v capacitance.

capacitor on mark & other; 2200μ F” Means that the capacitance of electric capacity of 2200 & mu; F。 As we know, 1 f = 1000 mf ( Milli method) ,1 mf = 1000亩; F 1μ; F = 1000 nf, 1 nf = 1000 pf。 2200μ F the capacitance, the capacity is large. This kind of capacitor is usually aluminum electrolytic capacitor, generally in the electronic circuit as a power supply filter.

for new aluminum electrolytic capacitor, lead long to the anode. When used, aluminum electrolytic capacitors are negative can't meet the, otherwise it is easy to damage. If add reverse voltage lower on opposite sides of the aluminum electrolytic capacitor ( The following 1 ~ 2 v) , then the capacitor leakage current will increase significantly.

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