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

Simple, low noise power supply
Simple, low noise power supply
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
Thread Tools Search this Thread
Old 15th November 2012, 01:56 AM   #1
Zoodle is offline Zoodle  Australia
diyAudio Member
Join Date: Jun 2009
Default Simple, low noise power supply

For a first project, I built an ESP P05B (dual rail). It works nicely, but I also need a 9v single rail supply (for a condenser microphone) and 12v single rail for a phono preamp. They are to replace a battery in the first case, and a cheap 'wall wart' in the second case.

Can I use just the + side of another P05B? Or is there something even simpler that I can put together as a point-to-point? I found some designs, but I don't know enough to identify which will be best soundwise. What do you think?


Last edited by Zoodle; 15th November 2012 at 03:17 AM.
  Reply With Quote
Old 15th November 2012, 03:43 AM   #2
gmphadte is offline gmphadte  India
diyAudio Member
Join Date: Jul 2003
Location: Dona paula, Goa
Yes, u can always use the + side...

If u want low noise, look for LT series adjustable regulators by Linear Tech. U will find application circuits on their datasheet.

You can also construct a shunt regulator with discretes and will be the best.

Gajanan Phadte
  Reply With Quote
Old 15th November 2012, 10:09 PM   #3
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
Join Date: Nov 2005
Simple, low noise power supply
that LM317 is easy to hardwire on proto matrix board, and easy
you only need to know the adjust values to get the right voltage
but no problem
I did this a few weeks ago, first time
nothing fancy, but its a fun and easy project

btw very small print trafos doesn't cost much
and I would suggest some bigger caps after the reg(4x 1000uf maybe ?)

I would suggest two boards
one with fuse/trafo, bridge and first smoothing
and another boardwith reg and 'cap battery'

trafo away from sensitive curcuit
and reg closer
Attached Images
File Type: jpg IMG_7706.JPG (189.5 KB, 484 views)
File Type: jpg IMG_7714.JPG (188.4 KB, 460 views)
  Reply With Quote
Old 18th November 2012, 01:39 AM   #4
zlab is offline zlab  Hong Kong
diyAudio Member
Join Date: Jul 2009
Hum, the suggested cap after the reg is relative small compare with the value you suggested, will it affected the response speed?
  Reply With Quote
Old 18th November 2012, 02:20 AM   #5
Andrew Eckhardt is offline Andrew Eckhardt  United States
diyAudio Member
Join Date: Nov 2005
With bigger output caps I be sure to add the output to input diode (D1, note E in the TI datasheet). This seems to ward off evil spirits. Looks like Tinitus' hand wire job has it.

Last edited by Andrew Eckhardt; 18th November 2012 at 02:22 AM.
  Reply With Quote
Old 18th November 2012, 09:05 AM   #6
metalsculptor is offline metalsculptor  Australia
diyAudio Member
Join Date: Sep 2010
Location: Melbourne
The diode is to prevent the capacitor after the regulator from driving the regulator in reverse it the main supply collapses for whatever reason.

Placing a capacitor after the reg will not affect the regulator response speed, that is set by the internals of the regulator, on the contrary it will slow the rate of load change thereby reducing the speed that the regulator has to respond to a change in load.
  Reply With Quote


Simple, low noise power supplyHide 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
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
LC Audio low noise DC power supply VT67 Power Supplies 6 17th March 2010 06:01 PM
Scavenging ultra low noise power supply jackinnj Power Supplies 3 7th September 2008 04:32 PM
power supply low noise GIPIONE Solid State 0 16th April 2005 03:33 PM

New To Site? Need Help?

All times are GMT. The time now is 06:25 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio