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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 == |
* 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 == |
[[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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"But in reality, there are only two important specifications that you should initially consider when selecting an op amp for your active, low-pass filter. ... Gain Bandwidth Product and Slew Rate." [Baker 2003] | "But in reality, there are only two important specifications that you should initially consider when selecting an op amp for your active, low-pass filter. ... Gain Bandwidth Product and Slew Rate." [Baker 2003] | ||
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=== designing the circuit around the op amp === | === designing the circuit around the op amp === | ||
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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"] | ||
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=== 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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* [http://www.epanorama.net/links/components.html Basic electronics components list] lists 10 of the most common op-amps. | * [http://www.epanorama.net/links/components.html Basic electronics components list] lists 10 of the most common op-amps. | ||
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| + | * [http://zero-distortion.com/tests/tweaking.htm "Tweaking" by Dejan V. Veselinovic] | ||
* [http://www.embedded.com/showArticle.jhtml?articleID=175400254 "How to choose the right bipolar op amp"] by J. Scott Elder 2005-12-23 | * [http://www.embedded.com/showArticle.jhtml?articleID=175400254 "How to choose the right bipolar op amp"] by J. Scott Elder 2005-12-23 | ||
