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Author Topic: 3v regulator needed  (Read 578 times)
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hi, i've made an arduino stripboard and need to connect a nrf24l01 that needs a maximum of 3.6v.
What's the best/cheapest regulator i can use to go from 5v to 3.3v or approximately ?

thanks
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I have uses an A033 regulator to get 3V3 from 5V.
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Is it this one http://pdf1.alldatasheet.com/datasheet-pdf/view/111555/ROHM/BA033T.html ?
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Any of these should do, provided their maximum input voltage is sufficient for whatever power supply you are using: http://uk.farnell.com/jsp/search/browse.jsp?N=2031+202724+110164907+110154309+110029860+110154305&Ns=P_PRICE_FARNELL_UK%7C0&Ntk=gensearch&Ntt=voltage+regulator&Ntx=mode+matchallpartial&locale=en_UK&appliedparametrics=true&getResults=true&suppressRedirect=true&isRedirect=&originalQueryURL=/jsp/search/browse.jsp%3FN%3D2031%2B202724%26Ntk%3Dgensearch%26Ntt%3Dvoltage%2Bregulator%26Ntx%3Dmode%2Bmatchallpartial%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_UK%26divisionLocale%3Den_UK%26catalogId%3D%26skipManufacturer%3Dfalse%26skipParametricAttributeId%3D%26prevNValues%3D2031%2B202724.
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The last thing you did is where you should start looking.
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You can use:


* 3.2.jpg (229.46 KB, 1284x427 - viewed 22 times.)
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The way you have it in your schematic isn't the same as how you have it wired up! That goes for me too.

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Quote
You can use:
You can but the regulation  is not very good and I would at least include some capacitors.
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Note:


* 3V.jpg (169.93 KB, 1193x435 - viewed 12 times.)
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The way you have it in your schematic isn't the same as how you have it wired up! That goes for me too.

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What's the best/cheapest regulator i can use to go from 5v to 3.3v or approximately ?

I am 100% sure that they are not the best, but the 1117s are the cheapest and crappiest regulator that gets the job done.
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If you actually look at the datasheet for a 1N400x diode, you'll see it's forward
drop varies from about 0.6V @ 50mA to about 0.8V at 250mA, so the output
of the 3 diode ckt will vary from about 3.2V to 2.6V with those loads. I'd go
with an LM1117, or other v.reg as mentioned, instead.
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