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

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Flickering bathroom LEDs / Dodgy transformer?
Flickering bathroom LEDs / Dodgy transformer?
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 12th September 2017, 01:52 PM   #1
Hemisphere is offline Hemisphere
diyAudio Member
 
Join Date: Aug 2009
Default Flickering bathroom LEDs / Dodgy transformer?

Just wondered if there are any bright sparks knocking about who can help me diagnose a domestic headscratcher!

Been having some problems with the bathroom lights - A couple of little LEDs in a bathroom mirror in the flat I'm staying at. Connected to a regular 240v AC lightswitch, and run through a little transformer box.

I've been long convinced that the issue was with the electric lightswitch, as it's clearly ancient with rust on the inside and the plastic parts are falling apart, so I tried a couple of times to fix it via the switch, with some apparently limited success (flickering stopped for a few minutes before resuming), that cemented my suspicion that it was the fault of the AC switch.

But now that switch has been completely replaced with another from another part of the flat and the problem persists, so I had a look at the transformer box - opened up the back panel (not of the transformer itself, but the area it was housed in), and jiggled the wires about. Success! The lights stopped flickering, again for a good 5 minutes at least. Again I convinced myself loose wiring was at fault and that I'd solved it (I was able to give the whole mirror box a decent whack and the light still stayed on).

So I closed it all back up again....and again it starts flickering!

It's not like a constant rate flicker but a much more sporadic one, varying in frequency and intensity. Does anyone know what might be causing this and is there anything I can do besides replacing the transformer altogether? (something I wouldn't want to do unless I knew it would fix the problem).

The other thing to note is that there were two bulbs initially. The first one blew and shortly after the second began to flicker. Is it possible the transformer is simply operating below it's minimum threshold of current draw with just one little LED to power and getting the second light refitted would fix the problem? I went to replace both bulbs initially but the second one is much more tightly sealed into it's housing so I've left it for now, but I will probably try replacing the second bulb before replacing the transformer.
  Reply With Quote
Old 12th September 2017, 02:07 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
diyAudio Member
 
JonSnell Electronic's Avatar
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
LED transformers produce a constant current. If one LED fails, it may overdrive the remaining LED and cause damage to the LED.
Alternatively you may find Clive has an answer for you; YouTube
__________________
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
  Reply With Quote
Old 12th September 2017, 02:07 PM   #3
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
If by "transformer" you actually mean SMPS PSU then they often have a minimum current below which they misbehave. In some cases people replace halogen bulbs with LEDs but leave the halogen 'transformer' in place; this rarely works - a trick is to add one halogen bulb in parallel with as many LEDs as you need.

Quote:
LED transformers produce a constant current.
That may be true for some, but others are constant voltage.

Last edited by DF96; 12th September 2017 at 02:09 PM. Reason: extend
  Reply With Quote
Old 13th September 2017, 02:09 AM   #4
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
If you suspect the light switch on the wall, take the unit elsewhere and plug it in. Does it work OK there?
  Reply With Quote

Reply


Flickering bathroom LEDs / Dodgy transformer?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Bathroom speaker and Reverb concerns RuRu Multi-Way 6 12th October 2016 11:56 PM
24V transformer with 4 VU drivers and LEDs PhantomBox Construction Tips 1 25th December 2013 12:03 AM
Help required for bathroom audio project the_chase1 Class D 8 15th November 2008 06:32 PM
Trade my blue LEDs for White LEDs CaliforniaBob Swap Meet 7 26th March 2004 08:28 AM


New To Site? Need Help?

All times are GMT. The time now is 03:24 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki