Universal Guitar Padal power supply - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 27th August 2014, 05:50 PM   #1
diyAudio Member
 
Join Date: Aug 2011
Exclamation Universal Guitar Padal power supply

Today I built a Universal 9volt dc power supply. It works fine. But i got some humming. Please rectify my circuits
Attached Images
File Type: jpg 001.jpg (493.2 KB, 34 views)
  Reply With Quote
Old 27th August 2014, 06:24 PM   #2
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
There's nothing wrong with your circuit.

Have you used fairly heavy wire for all the 0V connections ?
  Reply With Quote
Old 27th August 2014, 06:26 PM   #3
rayma is offline rayma  United States
diyAudio Member
 
Join Date: Apr 2011
Location: Upper midwest
Quote:
Originally Posted by rohansinha2000 View Post
Today I built a Universal 9volt dc power supply. It works fine. But i got some humming. Please rectify my circuits
You should measure around 16 VDC at the rectifier side. If it's much lower than that, the 4700uF capacitor could be bad.
The 4700uF capacitor should also be close to the rectifier's output.

Maybe there's rectifier noise coupling between the rectifier/4700uF part of the circuit and the regulator part.
The regulator's ground pin and the other caps should be all connected together separately from the rectifier/4700uF parts,
and a pair of +/- wires run to the 4700uF, twisted together if possible, connecting close to the capacitor's body, not farther down its leads.
There are current pulses flowing through the leads of the 4700uF from the rectifier, and the farther from the capacitor's body that you connect
the leads from the regulator, the more noise you will couple into it.

Last edited by rayma; 27th August 2014 at 06:50 PM.
  Reply With Quote
Old 27th August 2014, 06:49 PM   #4
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
Blog Entries: 1
Can you be sure the hum originates from the supply? I suspect it is in the guitar signal, as is usual with many guitars.

To reiterate, the "weakest link" for the introduction of hum into an electric guitar signal is the guitar itself. The supply however good, will never improve a noisy electric guitar signal.
__________________
Every new piece of knowledge pushes something else out of my brain - Homer.....................Simpson

Last edited by mondogenerator; 27th August 2014 at 06:51 PM.
  Reply With Quote
Old Yesterday, 07:36 AM   #5
diyAudio Member
 
Join Date: Feb 2013
Location: Soest
The problem with connecting multiple effect units to a single power supply is the additional audio/power ground connections that are created. Ground loops or a better way of explaining it might be parallel ground/return routing.

If this is the problem, you could try to build individual DC power supplies connected to single AC source. keeping all the ground connections separate.
__________________
Regards Mark.

Last edited by Mark Whitney; Yesterday at 07:44 AM.
  Reply With Quote
Old Yesterday, 05:43 PM   #6
zintolo is offline zintolo  Italy
diyAudio Member
 
Join Date: Sep 2012
Seems a typical ground loop.
All modern power supplies for guitar/bass stomp boxes have separeted grounds for each (group of) outlet.


Sent from abroad. At least.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ultra clean universal guitar pedal power supply rohansinha2000 Power Supplies 2 27th August 2014 10:49 PM
Universal Power Supply PCB Peter Daniel Audio Sector 73 1st October 2013 09:03 PM
ACA with Universal Power Supply bnorrish Pass Labs 4 24th November 2012 09:58 PM
Universal power supply board for audio amplifier siliconray Siliconray Online Electronics Store 11 13th February 2012 05:24 AM
My (almost universal) power supply Yoshy Power Supplies 0 7th September 2008 12:18 AM


New To Site? Need Help?

All times are GMT. The time now is 12:37 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2