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An op amp ("operational amplifier") is a very high gain voltage amplifier ( the normal type ) usually with differential input, and response from DC to 1 Meg Hz or more. Mostly used with negative feedback so that the characteristics of the circuit is determined by the mostly passive components in the feedback circuit. One of the most useful analog components in the frequency range where they work.
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An op amp ("operational amplifier") is ...
  
 
Great for amplifying weak signals from sensors to a more useful level. Also used in filters, integrators, etc.
 
Great for amplifying weak signals from sensors to a more useful level. Also used in filters, integrators, etc.
  
== Quick Summary ==
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== quick summary ==
  
 
* Many sensors need an amplifier to "buffer" their output signal. Often a single op amp is adequate. For very weak signals, you may want a "difference amplifier" or "instrumentation amplifier".
 
* Many sensors need an amplifier to "buffer" their output signal. Often a single op amp is adequate. For very weak signals, you may want a "difference amplifier" or "instrumentation amplifier".
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* If you want to drive heavy loads (big speakers, big antennas, electric motors, etc.), too heavy for typical op amps to drive, use op amps to amplify the signal to the desired voltage, followed by power transistors to drive the load [Veselinovic].
 
* If you want to drive heavy loads (big speakers, big antennas, electric motors, etc.), too heavy for typical op amps to drive, use op amps to amplify the signal to the desired voltage, followed by power transistors to drive the load [Veselinovic].
  
== Details ==
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== details ==
  
 
[[Suppliers]] such as Jameco, Digikey, and Newark each have pages and pages of fine print listing hundreds of op-amps, from "low-cost" quad op amps for under $0.40 each to "hi speed precision" op amps for well over $10 each.
 
[[Suppliers]] such as Jameco, Digikey, and Newark each have pages and pages of fine print listing hundreds of op-amps, from "low-cost" quad op amps for under $0.40 each to "hi speed precision" op amps for well over $10 each.
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* [http://www.maxim-ic.com/appnotes.cfm/appnote_number/738 "APPLICATION NOTE 738: Minimizing Component-Variation Sensitivity in Single Op Amp Filters"]
 
* [http://www.maxim-ic.com/appnotes.cfm/appnote_number/738 "APPLICATION NOTE 738: Minimizing Component-Variation Sensitivity in Single Op Amp Filters"]
 
=== CookBook of Circuits ( links ) ===
 
 
[[OpAmp Links]]
 
  
 
=== selecting the appropriate op amp out of the hundreds (thousands?) available ===
 
=== selecting the appropriate op amp out of the hundreds (thousands?) available ===

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