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Linear regulator PCB (LM317, LT1085, LM338, LT1083)
Linear regulator PCB (LM317, LT1085, LM338, LT1083)
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Old 7th May 2015, 12:56 AM   #71
johngalt47 is offline johngalt47  United States
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Linear regulator PCB (LM317, LT1085, LM338, LT1083)
Quote:
Originally Posted by mravlca View Post
Hi John,

you can't use LM337. This PCB only accepts positive regulators. If you look few posts up you can see how to connect two of these PCBs to get syxmmetrical power supply.

Best Regards,
Aleš
If I do it this way, do I use the same type device in both boards (i.e., LM317)?
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Old 11th May 2015, 09:16 AM   #72
mravlca is offline mravlca  Slovenia
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Quote:
Originally Posted by Christensen View Post
Aleš -I need 3.3V out. Do you have a proposal for components? and do you sell components?
Hi,

use usual components, but use only one red LED instead of two, if you still won't be able to set Vout to 3.3V, try using LED with small forward voltage.
I do not provide components for this PCB.

Quote:
Originally Posted by djonesii View Post
On your e-bay site, it says the boards will take DC as input. Would this be an option to use a SMPS to run a gainclone?
Yes, it can be an option. You would improve ripple rejection from SMPS and normally you would have better voltage regulation (depends on what kind of SMPS you are using). You should disregard rectifying diodes and you shouldn't use so big filtering capacitor. 2200uF-3300uF value should be sufficient.

Quote:
Originally Posted by johngalt47 View Post
If I do it this way, do I use the same type device in both boards (i.e., LM317)?
Yes, you use LM317 on both boards, but as mentioned before you need to use transformer with dual voltage output and not center tapped one.

Best Regards,
Aleš
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Old 26th May 2015, 05:10 PM   #73
aradan is offline aradan  Singapore
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Hi Ales,

Thank you for the great boards. I have received mine a while ago and building a 12v regulator now.

I have a question, based on the description on ebay there is a C2 SMD component which is required, although I am not able to find the place for it on the board. It looks like the PCB layout on ebay page and the one I have is slightly different.

I have C20, C4

The pcb on ebay has

LOW Noise Power Supply PCB FOR LT1083 LT1084 LT1085 LM317 LM338 1pcs TPA3116 | eBay


C1: 10000uF 35V ok, looks like it is called C20 on my board

C2: 100nF 50V 1206 SMD - where should this one be placed ?

C3: 10uF 50V 1206 SMD (optional component, but will improve ripple rejection) - where should this one be placed ?

C4: 100uF 35V - is OK, still have it

Thanks for your reply looking forward to finish the board soon !
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Old 26th May 2015, 09:39 PM   #74
mravlca is offline mravlca  Slovenia
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Quote:
Originally Posted by aradan View Post
Hi Ales,

Thank you for the great boards. I have received mine a while ago and building a 12v regulator now.

I have a question, based on the description on ebay there is a C2 SMD component which is required, although I am not able to find the place for it on the board. It looks like the PCB layout on ebay page and the one I have is slightly different.

I have C20, C4

The pcb on ebay has

LOW Noise Power Supply PCB FOR LT1083 LT1084 LT1085 LM317 LM338 1pcs TPA3116 | eBay


C1: 10000uF 35V ok, looks like it is called C20 on my board

C2: 100nF 50V 1206 SMD - where should this one be placed ?

C3: 10uF 50V 1206 SMD (optional component, but will improve ripple rejection) - where should this one be placed ?

C4: 100uF 35V - is OK, still have it

Thanks for your reply looking forward to finish the board soon !
Hi aradan,

some of these PCBs had silkscreen error, but nothing wrong with PCB itself.

C20 = C1
C2 should be placed under C1, on your PCB under C20.
C3 capacitor is on the bottom side of the PCB, between R2 trimmer and diode D6.

Best Regards,
Aleš
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Old 26th June 2015, 12:51 PM   #75
mravlca is offline mravlca  Slovenia
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Hey guys,

these PCB are back in stock and available. Black color only.

Best Regards,
Aleš
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Old 4th August 2015, 03:07 AM   #76
acg is offline acg  Australia
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Location: Sunshine State
Hi ales,

Boards have arrived. All looks good. Thanks for your help.

Cheers,

Anthony
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Old 22nd September 2015, 03:18 PM   #77
mravlca is offline mravlca  Slovenia
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Default LOWEST PRICE EVER!

You can now buy PCBs directly from dirtypcbs.

CLICK HERE TO BUY PCBS

What is this?
This is a universal power supply for regulators such as LM317, LM338, LM1084, LM1085, LT1086, LT1085, LT1084, LT1083 and other that have same pinout and their output voltage is configured same way.
Attached Images
File Type: jpg LM_LT_xx_V3_schematic.JPG (84.3 KB, 3264 views)
File Type: jpg LM_LT_xx_V3_silkscreen.JPG (163.6 KB, 3085 views)
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Old 9th November 2015, 08:55 PM   #78
mcandmar is offline mcandmar
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Sweet. I used one of your earlier versions in a recent build and it worked great, just found this searching for more

Cheers!
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Old 10th November 2015, 02:58 AM   #79
marcus1 is offline marcus1
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Just found this - thanks mravica.
I can never get the right parts when ordering - anyone do an order from Mouser or Digikey that details the correct part numbers?

Thanks

Quote:
Originally Posted by mravlca View Post
You can now buy PCBs directly from dirtypcbs.

CLICK HERE TO BUY PCBS

What is this?
This is a universal power supply for regulators such as LM317, LM338, LM1084, LM1085, LT1086, LT1085, LT1084, LT1083 and other that have same pinout and their output voltage is configured same way.
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Old 11th November 2015, 07:02 AM   #80
euforia is offline euforia  Sweden
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Join Date: Nov 2005
Location: Vächöttaslätta
You mention in your first post that you can use this as a preregulator, would it be possible to connect two of these board together to get even better ripple rejection?

I looked at the datasheet for LT1084 and could not find any suggestions for a dual setup for a tracking preregulating circiut as compared to datasheet for LM338 which has this pointed out, the regulators are not quite placed in series but rather in a parallel way and thus helping each-other.

Do you have any thoughts on this?

I found your PCB today and I really like the small form factor, my goal is to build a clean enough PSU for a MiniDSP 12v 1,5A and wonder if this might do the job? I have read about newer and more exotic regulator circuits using SMD mounted IC's but they all are limited to max 1A which isn't enough in this case.
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