Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

low noise Pre-Amp / DAC power supply MJE15034 TL072 Regulator based on STUDER 900
low noise Pre-Amp / DAC power supply MJE15034 TL072 Regulator based on STUDER 900
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th February 2019, 06:56 PM   #51
nikolacigo is offline nikolacigo  Croatia
diyAudio Member
 
Join Date: Nov 2018
I am really confused about this board.
Same pictures...same board on audiophonics,ebay,aliexpress...but different info abut max current...from 1A to 2A.
I can see some people say it can do 3A.
Attached Images
File Type: jpg Slika zaslona 2019-02-06 u 20.39.19.jpg (183.7 KB, 668 views)
File Type: jpg Slika zaslona 2019-02-06 u 20.32.52.jpg (131.7 KB, 665 views)

Last edited by nikolacigo; 6th February 2019 at 06:58 PM.
  Reply With Quote
Old 6th February 2019, 07:24 PM   #52
jonners is offline jonners  United Kingdom
diyAudio Member
 
jonners's Avatar
 
Join Date: Jan 2007
Location: Gloucestershire
@nikolacigo

You can't trust the specs. because they don't state the voltage at which the stated current is available. The ebay merchants are mostly re-sellers who don't know much about the board at all.
With an appropriate AC input you should be able to get 1.5A at 5V. If you want a continuous 1.5A you would probably need bigger heatsinks.
I'm successfully using a 5V boxed version to supply my RPi 3B+ (slightly underclocked and under-voltage). I had to fit a lower current-limiting resistor to get enough current. The MJE15034 transistor is heatsinked to the case, which gets only slightly warm.
  Reply With Quote
Old 6th February 2019, 09:10 PM   #53
nikolacigo is offline nikolacigo  Croatia
diyAudio Member
 
Join Date: Nov 2018
Thank you jonners.
You helped me many times.
I've read in this tread what you did and I am glad you have solve the problem.
Cheers
  Reply With Quote
Old 7th February 2019, 09:00 AM   #54
CallMeMike is online now CallMeMike  United Kingdom
diyAudio Member
 
Join Date: Jul 2016
Victor, If you use this board as a main PSU for the Katana kit supplying 12AC to it it is no suprise that the small heatsing cannot cope with the dissipation of a large amount of heat created... 12VAC x 1.41 = 16.92VCC after rectification and smoothing... meaning a drop of 12VCC to regulatory 5VCC. If you multiply 12VCC with the value of the current required for the task you'd get a self-explaining figure measured in 'watts'. A bigger heatsink or a quiet fan would help a lot in such cases. Are you sure that you've supplied 6VAC during the 'successful' trial...? It's a bit too low to work properly, I believe, maybe it was 9VAC...
  Reply With Quote
Old 7th February 2019, 03:56 PM   #55
vitorio is offline vitorio  Spain
diyAudio Member
 
Join Date: May 2010
Quote:
Originally Posted by nikolacigo View Post
Hi vitorio!
What model of Rpi do you have!?
Raspberry Pi 2 model B

Quote:
Originally Posted by jonners View Post
I'm surprised that it can work with as little as 6V ac. The Studer circuit (see pdf linked to in this thread) shows 10V across the TL072. Perhaps the actual output of your transformer is more than 6V?
Hi Jonners

You are right. Transformer label says 6+6 volts, but I measured it and actually is 7.0V ac under load. Output 5.0V dc and 6mV ac (standard multimeter). Heatsink is just warm, I can keep my finger on it.
Do you think 7.0V ac is too low for regulator? Can I expect improvement going to 12V ac again? If I do, I should change heatsink.

Thanks
Victor

Quote:
Originally Posted by CallMeMike View Post
Victor, If you use this board as a main PSU for the Katana kit supplying 12AC to it it is no suprise that the small heatsing cannot cope with the dissipation of a large amount of heat created... 12VAC x 1.41 = 16.92VCC after rectification and smoothing... meaning a drop of 12VCC to regulatory 5VCC. If you multiply 12VCC with the value of the current required for the task you'd get a self-explaining figure measured in 'watts'. A bigger heatsink or a quiet fan would help a lot in such cases. Are you sure that you've supplied 6VAC during the 'successful' trial...? It's a bit too low to work properly, I believe, maybe it was 9VAC...
You explain it perfecty. I didn't my homework and had to fix it later
  Reply With Quote
Old 7th February 2019, 05:04 PM   #56
jonners is offline jonners  United Kingdom
diyAudio Member
 
jonners's Avatar
 
Join Date: Jan 2007
Location: Gloucestershire
Quote:
Originally Posted by vitorio View Post
Do you think 7.0V ac is too low for regulator? Can I expect improvement going to 12V ac again? If I do, I should change heatsink.
If it's supplying a fairly steady 5V when the RPi boots up it's probably OK. I think 12V ac would be too much.
  Reply With Quote
Old 14th February 2019, 08:44 AM   #57
AlexScan is offline AlexScan  France
diyAudio Member
 
Join Date: Jun 2011
Location: Near Paris too
Hi all,

I need to build a power supply 12V-2A for my Terratec DMX6Fire, this board can match with my wish but the specs is not clear ...

How much ampere the board can output with 12V out ?
  Reply With Quote
Old 14th February 2019, 03:58 PM   #58
vitorio is offline vitorio  Spain
diyAudio Member
 
Join Date: May 2010
Alexcan
I think it can provide 2A. But check power dissipation.
CallMeMike explains it very well in a previous post.
  Reply With Quote
Old 20th February 2019, 03:29 PM   #59
jimk04 is offline jimk04  United Kingdom
diyAudio Member
 
Join Date: Jul 2018
Location: North Notts
Interesting psu, think I shall try one on my Google Chromecast and dac.
  Reply With Quote
Old 1st March 2019, 09:10 AM   #60
kotlarix is offline kotlarix  Norway
diyAudio Member
 
Join Date: Feb 2019
I recently purchased this Sturder KIT, I soldiered it and have few issues.

1. Toroidal transformer have 6V AC output (after connecting Sturder psu have 7.3V DC at the output)

2. Led are not glowing

3. It cannot regulate voltage (tinny screw)

4. By soldiering L/M/H contracts nothing change, it gives voltage at the output also when not soldiered
  Reply With Quote

Reply


low noise Pre-Amp / DAC power supply MJE15034 TL072 Regulator based on STUDER 900Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gerbers - Low noise Power Supply for pre-amp type circuits mlee Power Supplies 0 9th July 2014 08:38 PM
TL072 based Electret mic pre-amp not working correctly... Tinny and quiet. fraseyboy Chip Amps 29 12th May 2014 04:31 AM
Low Noise Linear regulator power supply leonm12 Power Supplies 13 13th June 2011 03:50 PM
preamp supply LOW power LOW noise LOW cost drdagor Power Supplies 1 13th September 2010 11:39 PM
Simple and Low noise Pre-regulators for DAC machinow Digital Source 2 10th September 2004 01:04 PM


New To Site? Need Help?

All times are GMT. The time now is 04:39 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki