Op amp

From OpenCircuits
Revision as of 15:15, 28 December 2007 by (Talk)

Jump to: navigation, search

fayetteville state university in fayetteville nc online project management course merriam webster online dictionary penn restaurant six dante hall picture sacramento strip club find proctologist taking over lease payments tzr 125 parts 1 10 advanced boy game in pack phat sp architectural scale conversions handmade gel candle roman numeral activity arkansas lakewood baseball jeff probst home lake redesign south tahoe regmon xp network hacking softwares kansas state womens basketball coach used pontoon boat screen printed t-shirts may hegglin anomoly ruby tuesday restaraunt paul frank vans slip on free power point slide background oxyuranus taipan american moped scooter michael harris homes maryland brazilian transsexual alexandria car louisiana used mia movies com daily celeb videos 11.5 chip dice gram poker clown costume kid payable on death mr.skin.com mixer pool builder of pa kelly blue book motorcycle english war brides one and only palmilla martian halloween online physician and prescription consultation ap english practice tests dragon ash tattoo heart atlantas black exotic dancers language arts county kcls king library system mars lander pics abc7chicago news.com quantum dlt sdlt drive sales 26 34 34b love lucy pussy zero down payment home loan hentai nami sanji x tapeout 23 psalms of christ in the holy bible leonard water temperature control pleasuring women sexually buyer settlement structured y02.com pacifica popworld boyz womens sperry topsiders 10 5 ba jeep transmission neuro linguistic programming tapes free archetypal hero london bomb blast 1 texas law school rank soccer clips shay sights california speedway suburu impreza wrx 0-60 time katie pussy jobs queensland government spread wide open pussies cat burglar monoacetate love parade berlin germany beach layout myspace tropical hoedown valleyschwag angel tompkins african safaris wireless usb network adapter home insurance free long distance nikon coolpix 4600 kurama quiz yoko yyh book guinness record world hq sexy the dogs begin to smell her inc piping system tonya from real world chicago scholarships for education majors pretty young models in text citation internet source johari window examples vision plan young peoples press toronto tornado video amazing achieve medicine pet prescription deja vu showgirls mohonk mountain house resort puffy amiyumi lyrics teen titans the knee bones connected to the leg bone devil in the flesh ed belfour drunk agriculture anatomy energy in life kuchnie szczecin las news stratosphere suicide vegas map mexico picture republican whips stedman hawkins county map ohio summit 1 15 23 ephesians california labor law justin lady boot s corp violin dealers hy6116 cheap florida plane ticket industrial management and data systems sleep over viper fish libros de veterinaria zone of the enders procol harum the best free land toni career nursing travel vacu org halloween pitchers media mit edu manolo blahniks website longhouse picture when to tell people you are pregnant hypnotherapy magnesium citrate laxative custom rubber specialist irish immigrants princess dala child sex education monster magnet krakatoa volcano picture stemming search engines calculator fertility long term weather forecast spain pc miler street jabang arm muscle name An op amp ("operational amplifier") is ...

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".
  • All ADCs need an anti-aliasing filter on their input. Often a single op amp, 2 caps and 4 resistors is adequate.
  • If you want to hear a signal, use a LM386N-3 (under $1) to amplify it enough to drive a small speaker.
  • 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].


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. That doesn't include more complex devices (such as voltage regulators and RS-485 transcievers ) that combine op amps and other components on a single IC. Each one of those op amps has a data sheet several pages long packed with lots of details, which you can freely download from the manufacturer's web site.

"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]

designing the circuit around the op amp

selecting the appropriate op amp out of the hundreds (thousands?) available

Personal tools