simple adjustable voltage regulator?

AKHeathen · 1st October 2011, 11:02 AM

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.

mickeymoose · 1st October 2011, 09:32 PM

Doing a google search would not take much time and could hardly be called research....! E

Enzo · 1st October 2011, 11:04 PM

Especially since "adjustable voltage regulator" is a common type of component already.

infinia · 12:00 AM

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.

AKHeathen · 2nd October 2011, 02:11 AM

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.

Enzo · 4th October 2011, 01:21 AM

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.

AKHeathen · 4th October 2011, 01:23 PM

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.

1st October 2011, 11:02 AM	#1
AKHeathen diyAudio Member Join Date: Apr 2011 Location: Anchorage AK	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.

1st October 2011, 11:56 PM	#4
infinia diyAudio Member Join Date: May 2005 Location: Californication	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. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust Last edited by infinia; 2nd October 2011 at 12:00 AM.

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1st October 2011, 09:32 PM	#2
mickeymoose diyAudio Member Join Date: Nov 2008	Doing a google search would not take much time and could hardly be called research....! E

1st October 2011, 11:04 PM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Especially since "adjustable voltage regulator" is a common type of component already.

2nd October 2011, 02:11 AM	#5
AKHeathen diyAudio Member Join Date: Apr 2011 Location: Anchorage AK	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.

4th October 2011, 01:21 AM	#6
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	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.

4th October 2011, 01:23 PM	#7
AKHeathen diyAudio Member Join Date: Apr 2011 Location: Anchorage AK	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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