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

AKSA Builders of market proven kits and modules at sound quality to rival the best in high end

Reply
 
Thread Tools Search this Thread
Old 20th August 2019, 03:36 PM   #1
saf is offline saf  Portugal
diyAudio Member
 
Join Date: Sep 2009
Location: Porto
Default LED hum on toroidal trannie

This forum has been quiet. Too quiet.
Hugh whats up with the news flash ? How is Aspen Business ? What are you selling now ?

Let me just post something make chit chat.
I have been lurking on my LifeForce55 this week, finishing the casework and handles, plus i wanted to install a new LED light connected to DC output from the PSupply.

Problem is, when i connect the LED the transformer (toroid from AVelLindberg) they start generating a pretty considerable hum/rattle. Typically oscillating. I know there are better toroids but i am trying to keep costs low and use these i already have.
This is not too strong, but enough to notice the difference with LED vs without it.

Strange for a LED light to induce the transformer rattle...no ?
Anyway, i just wanted an excuse to shake up the forum !
Cheers
Filipe
  Reply With Quote
Old 21st August 2019, 08:09 AM   #2
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Hi Filipe,
Thanks for your post, sorry for your issue with the LED.
Try putting 10uF 10VW (or higher) across the LED.
Should stop the noise.........
Still selling Mayas! I will give you more information privately.

Cheers,
Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 21st August 2019, 10:51 AM   #3
saf is offline saf  Portugal
diyAudio Member
 
Join Date: Sep 2009
Location: Porto
Hi High,
Film cap non polarized right?
  Reply With Quote
Old 21st August 2019, 02:15 PM   #4
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Hmm, Filipe, an electro preferably but a film cap would work though quite large........

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 22nd August 2019, 10:08 PM   #5
saf is offline saf  Portugal
diyAudio Member
 
Join Date: Sep 2009
Location: Porto
Solved it with a 20UF 50V Eletro Alu cap.
Thank you Hugh
  Reply With Quote
Old 23rd August 2019, 12:38 AM   #6
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Aha, a wonderful happy ending!
We don't have many of them in audio!
Thank you very much for giving me a response Filipe, this tells me that any blue LED should have a small electro around it to remove noise where it might enter the signal path.........
I owe you a long email today, give me a couple of hours.
Cheers,
Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 16th September 2019, 10:04 PM   #7
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Quote:
Originally Posted by AKSA View Post
this tells me that any blue LED should have a small electro around it to remove noise where it might enter the signal path.........
Very interesting, Hugh. Is this only for blue LEDs ... or also the red & yellow ones that I use?

Andy
  Reply With Quote
Old 17th September 2019, 12:39 AM   #8
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
This does not happen with green LED, Andy, but it begs the question: do other LEDs create noise? We know blue does, but I would expect orange and white. I'm not convinced red is an issue however.

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 17th September 2019, 01:02 AM   #9
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Quote:
Originally Posted by AKSA View Post
This does not happen with green LED, Andy, but it begs the question: do other LEDs create noise? We know blue does, but I would expect orange and white. I'm not convinced red is an issue however.

Hugh
Thanks, Hugh. I've certainly never noticed any transformer noise in all the amps I've built, using red & yellow LEDs to show DC rail power 'on'.

Strange that Felipe found that the (blue) LED caused his power traffo to make a noise. I could understand that a LED might cause HF hash in the signal you hear from the speakers (by, say, causing oscillations on the DC rail) but a power traffo!

Andy
  Reply With Quote
Old 17th September 2019, 04:19 AM   #10
suresh is offline suresh  India
diyAudio Member
 
suresh's Avatar
 
Join Date: Jun 2005
Location: cuddalore
i have used 3mm blue led in my maya modules . i never had this problem. my amp is dead silent.
__________________
R.Suresh.
  Reply With Quote

Reply


LED hum on toroidal trannieHide 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
Identifying Power Trannie from Sub? Freecrowder Power Supplies 2 28th August 2013 10:25 PM
The Right Tube & TRannie IRON AND GLASS Tubes / Valves 4 19th January 2012 08:19 PM
unknown output trannie gja Tubes / Valves 1 12th September 2007 02:49 PM
power trannie then_dude Power Supplies 2 30th May 2007 03:02 PM
surplus Trannie pinkmouse Parts 3 14th October 2002 10:37 PM


New To Site? Need Help?

All times are GMT. The time now is 05:07 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki