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Old 1st October 2011, 11:02 AM   #1
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Default simple adjustable voltage regulator?

anyone have a schematic floating around to build a simple adjustable voltage regulator? what i ahve to work with is about 18vdc, and i want to be able to adjust it between 10.5 and 16. right now, i'm implementing a 16v shunt, but i would rather step away from shunt, and adjust. btw, i need to handle 10a, though i may build another at much higher amperage. just don't have time to research it right now.
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Old 1st October 2011, 09:32 PM   #2
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Doing a google search would not take much time and could hardly be called research....! E
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Old 1st October 2011, 11:04 PM   #3
Enzo is offline Enzo  United States
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Especially since "adjustable voltage regulator" is a common type of component already.
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Old 1st October 2011, 11:56 PM   #4
infinia is offline infinia  United States
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Currents of 10A and higher is never simple! check the ESP site for the battery charger project. A few resistors will need to be changed on the V adj circuit. Read it and I could answer any Q.note> I'm guessing 16 V out maybe an issue with only 18V DC input depending on exact transformer used resulting from output current and ripple voltage. ie If you can use higher Vin-Vout this relatively simple circuit will be fine.
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Last edited by infinia; 2nd October 2011 at 12:00 AM.
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Old 2nd October 2011, 02:11 AM   #5
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sorry to bother with something so simple..... i just hop on the plane to work wed. i was just looking to put together something tried and true. that esp charger project took a bit to find, but i got it. i'm going to order the parts, and build it when i get back home, but for now, i'm going to try and put together an lm350, or 317based setup and try to sinc 4, or 6 of them to get me buy on crappy nte parts(local option) thanks for the flogging and help.
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Old 4th October 2011, 01:21 AM   #6
Enzo is offline Enzo  United States
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If you look at the data sheets and application notes for the various adjustable regulators, many show circuit for higher currents. The essense of it is using the LM317 with a large pass transistor added to carry the current. The 317 controls the transistor.
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Old 4th October 2011, 01:23 PM   #7
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i may just do that... time is running short before i get to work, so i may introduce an array of 4, or more power transistiors, using a single 317 as a driver. have 3 weeks to get it sorted, now....plenty of time for some research/design...thanks.
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Old 2nd July 2012, 12:23 PM   #8
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Check out this resource:

How to Connect an Adjustable Voltage Regulator

It shows how to connect a LM317 adjustable voltage regulator. All you have to do is
change the output resistors to adjust it to the level that you want to. The formula to output the 10.5 to 16V you want to is also on the page above.
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