Editing Driving Large Loads with the Arduino

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In some sense anything that can be used to drive a large load is an amplifier, a device with a output bigger than its input.  If you want loud sounds from a Arduino you can use some computer's amplified speakers, or a hi fi.  There are some cautions, but it is pretty basic, for most audio amplifiers the arduino outputs are close to what these audio amplifiers expect as inputs.  
 
In some sense anything that can be used to drive a large load is an amplifier, a device with a output bigger than its input.  If you want loud sounds from a Arduino you can use some computer's amplified speakers, or a hi fi.  There are some cautions, but it is pretty basic, for most audio amplifiers the arduino outputs are close to what these audio amplifiers expect as inputs.  
  
In many cases a simpler amplifier will do, many of these fall in the category of a low side switch ( [[http://www.opencircuits.com/Basic_Circuits_and_Circuit_Building_Blocks#Transistor_Low_Side_Switch |Transistor Low Side Switch ]] ).  Here is a schematic of one using a push button ( not useful for the arduino, because the arduino cannot press the switch ):
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In many cases a simpler amplifier will do, many of these fall in the category of a low side switch ( http://www.opencircuits.com/Basic_Circuits_and_Circuit_Building_Blocks#Transistor_Low_Side_Switch |Transistor Low Side Switch ]] ).  Here is a schematic of one using a push button ( not useful for the arduino, because the arduino cannot press the switch ):
  
<schematic here>
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schematic here
  
 
To be useful to the Arduino you need to replace the push button with something the Arduino can push:
 
To be useful to the Arduino you need to replace the push button with something the Arduino can push:
  
*Relay  
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*Relay  
*Transistor ( bipolar, but not too depressed )
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*Transistor ( bipolar, but not too depressed )
*Transistor ( fet, field effect )
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*Transistor ( fet, field effect )
*Triac
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*Triac
*Driver ICs
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*Driver ICs
  
 
== Relay  ==
 
== Relay  ==

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