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 Capacitors: What Good Are They?
A capacitor is a passive electronic component that stores energy in the form of an electrostatic field.  In its simplest form, a capacitor consists of two conducting plates separated by an insulating material called the dielectric.  Capacitance is directly proportional to the surface areas of the plates, and is inversely proportional to the plates' separation. 
Capacitance also depends on the dielectric constant of the dielectric material separating the plates.

The standard units of Capacitance,
farad: F 
microfarad: µF (1 µF = 10-6 F) 
picofarad: pF (1 pF = 10-12 F)

555 Timer
 Capacitor as a Timing Element
 
 
 A.C. & D.C. Coupling 
Notice  Differentiation in the A.C. channel
 Capacitor as a Coupling Element
 
R.C. & D.C. Coupling 
Notice  Integration in the R.C. channel
Capacitor as a Filtering Element
 
Capacitor as a Power Supply "Bypassing" Element
Frequency Domain
Time Domain
Note the Effect of Lead Length & Capacitor Type on Power Rail NOISE

   
     
     

 
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