How to find "the opamp that get the job done" - Page 1
Forum section: electronics / beginners

author: Lovely_Santa
author_rank: Contributor
timestamp: April 05, 2016, 08:12:07 am
content: Hello EEVbloggers!Maybe a stupid question... When I make a circuit by myself I usualy go for OpAmps that I used before, by that I mean: OpAmps that I have in stock...But like now for example: I have a circuit that needs a new OpAmp (becose it's broken)... In this example it was an MC34071. So I looked for the OpAmp on my supply website, but they don't sell it.. So I went looking for a similar OpAmp with this (critical) specs:Single supply >12VRail to rail input and outputHigh slew rate (like >10V/µs)Bandwidth not so importantShort circuit protectionDIL8 packageSold onconradSo how I do it, I go to digikey and select the specs, and look what kind of opamps that are usefull for the job...Then I look them up in conrad, to see if they sell it (and the price for it)So how do you find your opamps for a job?Greets,Lovely santa

author: hammy
author_rank: Unknown
timestamp: April 05, 2016, 09:09:11 am
content: Have a look athttp://parts.io/There is a category for OpAmps:http://parts.io/search/Class-Amplifier%20Circuits/Category-Operational%20AmplifiersGot to "Show All Filters" (grey box in the middle of the site) and enter the needed values.The Bloghttp://blog.parts.io/contains several "how to use parts.io" stories.Another old school method are Books.Cheershammy

author: hammy
author_rank: Unknown
timestamp: April 05, 2016, 09:15:01 am
content: Dear SantaQuote from: Lovely_Santa on April 05, 2016, 08:12:07 amGive it a try on Amazon.www.amazon.de-> There are "MC34071PG IC OPAMP SGL SUPPLY 4.5MHZ 8DIP 34071 MC34071" available.www.amazon.com-> there are many availableCheershammy

author: Lovely_Santa
author_rank: Contributor
timestamp: April 05, 2016, 09:36:02 am
content: Quote from: hammy on April 05, 2016, 09:15:01 amThat is my problem: I like to stick with conrad, becose of the shipping costsQuote from: hammy on April 05, 2016, 09:09:11 amThanksI'll try that

author: MrSlack
author_rank: Frequent Contributor
timestamp: April 05, 2016, 09:42:42 am
content: Quote from: hammy on April 05, 2016, 09:09:11 amDidn't know about parts.io - rather good. Throwing my towers transistor selector in the bin now

author: hammy
author_rank: Unknown
timestamp: April 05, 2016, 09:59:35 am
content: Quote from: MrSlack on April 05, 2016, 09:42:42 amA lot of these old databooks are free available as PDF. Sometimes, repairing old hardware, these PDFs are worth their weight in gold.

author: danadak
author_rank: Super Contributor
timestamp: April 05, 2016, 10:01:51 am
content: Generally speaking by going to a specific vendors website, like TI, LTC, Fairchild,ST.... they have part filterable selector tools. More importantly their selector guidesare updated for product viability, eg. is it recommended for new designs.Vendors, like most businesses, get the majority of their income from a small # users,and when the high volume guy goes away marketing re-evaluates keeping product inproduction vs drop it and have their sales focused on latest part, with more features,and usually more price.Just a thought.Regards, Dana.