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Discussion:
 
Discussion:
  
The circuit above is very basic.  Practical circuits normally include filter capacitors on both the input and the output.  Most regulators protect against both over temperature and over current.  Regulators come in various voltages both positive and negative.  They also vary in maximum current output. There are also adjustable regulators, ways of using regular regulators as adjustable ones, and ways of boosting the current output.  The spec sheets often describe how to do these things.  Voltage regulators “use up” a couple of volts of the input voltage, low drop out regulators have use less, cost more.  It is a good idea to check the specification for any regulator you are going to use.  The LM78xx ( positive ) and LM79xx ( negative ) are quite common.  Most three terminal devices are "linear" they disappate the excess power in the input as heat, thus they are not very efficient.  Switching regulators can be much more efficient, but are not normally 3 terminal devices ( although you and make it one by putting the entire circuit in a box with just 3 wires coming out ).
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The circuit above is very basic.  Practical circuits normally include filter capacitors on both the input and the output.  Most regulators protect against both over temperature and over current.  Regulators come in various voltages both positive and negative.  They also vary in maximum current output. There are also adjustable regulators, ways of using regular regulators as adjustable ones, and ways of boosting the current output.  The spec sheets often describe how to do these things.  Voltage regulators “use up” a couple of volts of the input voltage, low drop out regulators have use less, cost more.  It is a good idea to check the specification for any regulator you are going to use.  The LM78xx ( positive ) and LM79xx ( negative ) are quite common.
  
 
More information:   
 
More information:   
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*[http://en.wikipedia.org/wiki/7805 7805 From Wikipedia, the free encyclopedia]
 
*[http://en.wikipedia.org/wiki/7805 7805 From Wikipedia, the free encyclopedia]
 
*[http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html Simple 5V power supply for digital circuits]
 
*[http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html Simple 5V power supply for digital circuits]
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== Transistor Low Side Switch ==
 
== Transistor Low Side Switch ==

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