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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) 
nanofarad: nF (1 nF = 10-9 F) 
picofarad: pF (1 pF = 10-12 F)

555 Timer

"Click"& See me Move
--------------------------------------Animation Speed--------------------------------------
Fast
Med
Slow
Very Slow
 Capacitor as a Timing Element
 For more on the 555 timer check out our 555 Page
 
 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
 
Capacitors as Power Supply "Bypassing" Elements
------------Frequency Domain
----------Time Domain
 
Note the Effect of Lead Length & Capacitor Type on Power Rail NOISE
For more on Bypass Capacitors check out our Bypassing Page
Bypass Capacitors' Minimum Impedance at Self Resonance Paralleling Bypass Capacitors 
for Maximum Effectiveness

                                                               An illustration of the effects of Inductance due to Excessive 
Lead Length.
..
 LINKS:  Vendors:  
 Bypassing  Tantalum capacitors  
     
.
 
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