SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-29T07:47:43-06:00SparkFun ElectronicsCustomer #358675 on COM-00527 - Voltage Regulator - AdjustableCustomer #358675urn:uuid:dabaacec-f20c-87c6-0ebc-95070ee7e5e42016-07-25T11:45:21-06:00<p>Need to fix the calculator link..</p>
jcholton on COM-00527 - Voltage Regulator - Adjustablejcholtonurn:uuid:c63b765d-b8bd-8848-e05e-ac3856ed595c2014-08-31T19:16:49-06:00<p>Hey guys. I made a pretty cool tutorial demonstrating the ability to adjust the voltage of one of these by simply using a potentiometer. Check it out: http://www.instructables.com/id/Easy-Adjustable-Speed-Pocket-Fan/</p>
M-Short on COM-00527 - Voltage Regulator - AdjustableM-Shorturn:uuid:33e27e01-4aca-b2ec-8253-e600e43f24e82014-07-22T08:32:58-06:00<p>Connecting the output of 2 power sources is never really a good idea even if they are suppose to be the same value (they never are, between resistor tolerances and regulator tolerances). If you need 1.5A I would recommend finding an adjustable voltage regulator that can do 1.5A. While this is the only one we carry, try Digikey, they will probably have what you need.</p>
Customer #476838 on COM-00527 - Voltage Regulator - AdjustableCustomer #476838urn:uuid:b28cfb85-bd0d-0505-918a-30917ae9ac312014-07-21T19:51:56-06:00<p>can these be put in parallel if more than 1.5A is needed?</p>
Mark Fickett on COM-00527 - Voltage Regulator - AdjustableMark Ficketturn:uuid:6a3b22e7-3e82-bb73-db3d-af81ba3a9a4f2014-05-23T21:44:26-06:00<p>I think this is it: http://www.onsemi.com/pub_link/Collateral/LM317-D.PDF</p>
incyi on COM-00527 - Voltage Regulator - Adjustableincyiurn:uuid:0109c137-6bf4-2801-10df-ad1d3185fc082014-05-09T08:52:10-06:00<p>Link to datasheet doesn't work. Can somebody help me with the correct link ?</p>
Customer #500261 on COM-00527 - Voltage Regulator - AdjustableCustomer #500261urn:uuid:5c534bed-5567-2a00-a081-69c79d0ddc232014-04-23T11:53:46-06:00<p>Datasheet link is a 404</p>
rben13 on COM-00527 - Voltage Regulator - Adjustablerben13urn:uuid:a6ffd8b3-22a2-7365-e82e-2124ca7f9a242012-10-10T19:10:33-06:00<p>The top piece serves 3 functions:
* It provides a way to secure the IC
* It is a heat sink
* It is also connected to the output. The reason it's connected to the output is so it can do the best job possible of removing heat from the actual chip. If you are mounting this chip to something metal, using the screw hole, you should be sure to use a T-220 mounting kit or a mica insulator, especially if the piece of metal is grounded or electrically connected to any other part of the circuit.</p>
rben13 on COM-00527 - Voltage Regulator - Adjustablerben13urn:uuid:7c52cf25-f6f3-acac-78b0-1ff46933e8052012-10-10T19:07:42-06:00<p>Shouldn't you carry the LM337, as well, so you provide a regulator that can be used for negative voltage power supplies?</p>
tolik777 on COM-00527 - Voltage Regulator - Adjustabletolik777urn:uuid:9d0489fa-9e00-9b1d-4417-68c847b18e852012-08-21T22:54:09-06:00<p>I found other lm317t calc: <a href="http://english.cxem.net/calc/lm317_calc.php" rel="nofollow">LM317/LM350/LM338 Calculator</a><p>I think it's best on-line calculator for 317</p></p>
ATtiny Fan on COM-00527 - Voltage Regulator - AdjustableATtiny Fanurn:uuid:c3ec3ed3-def3-53e4-e6bf-c8e93b6c7a102012-05-02T17:55:41-06:00<p>Just because it can go up to 37V doesn't mean you should use that much, especially without a heatsink.</p>
Lefty4000 on COM-00527 - Voltage Regulator - AdjustableLefty4000urn:uuid:1ba32660-1cc6-4fc5-7b4b-a70abc3c4d3b2012-01-08T14:17:14-07:00<p>The data sheet says that the Vout is the top metal piece and then the middle pin. Whats the top piece for? I always thought it was just a screw hole.</p>
BikeLighting on COM-00527 - Voltage Regulator - AdjustableBikeLightingurn:uuid:dde08aeb-52da-dc28-494a-aeac6c10e9922011-11-26T22:23:21-07:00<pre><code> Can anyone suggest the bare minimum beside the two resistors to give me a 1 amp max output current?
To charge an LI battery at 4.2V, the calculator shows me I should use R2=570 ohms. But how can I determine how much current this will pass to the batteries? Specs on this list a 1.5A output current. I need to limit charge current to 1.0 Amps for safety, as per standard lithium ion safe practices.
</code><p>Would it be simple as calculating the correct RsubS value shown under load regulation on page 8 of the spec sheet? Is there an equation or calculator to determine RsubS?
I'm severely limited on space too, no larger than what the Sparkfun Lipoly USB basic charger takes up, and no taller than a 2.1mm barrer connector.
tia,
Barry, bike light designer at Barry Beams Bicycle Lights</p></pre>
Comrad_Durandal on COM-00527 - Voltage Regulator - AdjustableComrad_Durandalurn:uuid:c170261c-1bb0-7f33-8ed2-4afe1f4adc3b2011-11-25T12:17:15-07:00<p>Now that would be a wake up call - TADA! 40V right in the input!<p>I'd imagine when you design your circuit - you'd design it so that no load connected to the supply, you pull at least the minimum draw somehow - lights, resistor, etc?</p></p>
BenjB on COM-00527 - Voltage Regulator - AdjustableBenjBurn:uuid:78bb023e-5a56-0327-c3e0-9536015ce3712011-08-30T13:07:28-06:00<p>The data sheet gives a minimum current draw to maintain regulation. Does anyone know what behavior to expect if this current isn't being drawn? I'm picturing some disaster like having it power an Arduino that is temporarily turned off, and then when it's turned on, awaking to 40 volts.</p>
Mark D. on COM-00527 - Voltage Regulator - AdjustableMark D.urn:uuid:65e6173f-4b5e-2099-6cfd-8b059a4c52672011-04-19T23:12:56-06:00<p>1.2/R1 * (R1 + R2) = Vout<br>
Or, the website's mathematical equivalent formula:<br>
VOUT = 1.25 * ( 1 + R2/R1 )<br>
Neither of them are that hard to do.</p>
carpii on COM-00527 - Voltage Regulator - Adjustablecarpiiurn:uuid:d873bc58-b2a7-5a15-63a4-f41eca18aa822011-01-17T14:23:08-07:00<p>I know the 'LM317 Calculator' is a third party site, not run by SparkFun.<br>
but this calculator only lets you input R1 and R1 and get output voltage, whereas I needed to input VOUT and R1, to get R2<br>
Could I recommend this link?<br>
http://www.reuk.co.uk/LM317-Voltage-Calculator.htm<br>
The site isnt as pretty as the existing one, but has two calculators depending on your needs :)</p>
PresidentOfAwesomeness on COM-00527 - Voltage Regulator - AdjustablePresidentOfAwesomenessurn:uuid:95dc3011-7a9e-ef95-ae80-18c51f42d1322010-05-02T06:50:58-06:00<p>Uh... datasheet says output is adjustable from 1.25 volts to 37 volts, not 25.</p>
Dragon2 on COM-00527 - Voltage Regulator - AdjustableDragon2urn:uuid:aa345384-cf5a-1486-f212-129ab49817ed2010-03-15T13:06:29-06:00<p>No the input voltage must be 1.5v higher then the output voltage therefore you would not get 9 volts with a 9 volt battery the most you would get is 7.5 volts. Also if you wanted 9 volts from a wall wart you would need a 10.5 volt one but a 12 volt would be the best</p>
Szechuan on COM-00527 - Voltage Regulator - AdjustableSzechuanurn:uuid:aacbd907-69fd-6de2-1f27-984962b49f182010-01-23T17:14:29-07:00<p>If I wanted this to be able to supply 9 volts, for when I have a dc jack and 9V battery connected, would it still supply 9V if I removed the jack?</p>