Noise when people turn off lights - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 26th June 2004, 07:45 PM   #1
whee is offline whee  Norway
diyAudio Member
 
Join Date: Jan 2004
Location: Oslo
Default Noise when people turn off lights

I'm just finished my amplifier, but i have one problem. Every time someone in my my building, or in my own apartment, turn off their lights, i hear a "click" in my speakers....
I don't understand it. The powersupply is "made by the book", and the ampilfier is earthed. I even tried to connect a AC filter.

Can someone help me??
  Reply With Quote
Old 26th June 2004, 08:19 PM   #2
lucpes is offline lucpes  Europe
diyAudio Member
 
Join Date: Dec 2003
Location: Iasi
Send a message via Yahoo to lucpes
Try using a 250V MOV (Metal Oxide Varistor) paralleled to your mains.
__________________
Deep down inside.
  Reply With Quote
Old 28th June 2004, 07:59 AM   #3
AndersP is offline AndersP  Sweden
diyAudio Member
 
Join Date: Aug 2002
Location: Middle Sweden
I had the same problem when I lived in Norway. I tried with a simple net filter for PC,s but did not succeed. When I moved home to Sweden after 9 years the problem was gone.

I know that the power system in Norway is pretty unique and that net filters have to be designed especially for norwegian conditions.

I would recommend you to contact someone at Electrocompaniet or Dynamic Precision and ask them.
  Reply With Quote
Old 28th June 2004, 09:05 AM   #4
hjelm is offline hjelm  Sweden
diyAudio Member
 
hjelm's Avatar
 
Join Date: Nov 2003
Location: Västerås
What more exactly is the uniqueness of the nowegian power system.
Just curious.
__________________
Hjelm
  Reply With Quote
Old 28th June 2004, 09:05 AM   #5
diyAudio Member
 
ashok's Avatar
 
Join Date: Jun 2002
Location: 3RS
Default RF?

There are two ways the 'switch' noise could get into your amp.
One is through the transformer --- also try inverting the polarity of the mains cable.
The other is due to RF sensitivity. Some amps are sensitive and some are not. Of the several amps and preamps I have built , some have this problem and others don't. All in the same room.
It has baffled me and I can only think of the two reasons given above.
Does anyone else have an explanation.
Poor household wiring also has a part to play. If the return path of the wiring is not done well it is possible to 'lift' the neutral terminal by several volts when switching something else. I've seen this happen at some locations.
Cheers.
__________________
AM
  Reply With Quote
Old 4th July 2004, 07:36 PM   #6
diyAudio Member
 
Graham Maynard's Avatar
 
Join Date: Dec 2003
Location: UK
Hi whee.

Are your loudspeaker cables picking up stray voltage fields ?

Use a portable AM receiver tuned between 150kHz and 1MHz, but not to a radio station, to check for power cable routes, then make sure that your audio cables are nowhere near them.

You could try a second Zobel network across the output terminals, say 2.2 ohms and 22nF in series.

You could also try looping both output and LS return cables together two or three times through a ferrite ring.

Cheers ................ Graham.
  Reply With Quote
Old 4th July 2004, 07:52 PM   #7
Account Disabled
 
Join Date: Apr 2003
Location: US
Quote:
Originally posted by Graham Maynard
Cheers ................ Graham.

Hi, Graham: welcome back. I don't want to lose you for good for the 3rd time.

anything to report on your first cycle distortion?
  Reply With Quote
Old 5th July 2004, 05:45 AM   #8
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
This happened to my old amplifier before, got worse and worse with time. Not so much just for lights though but appliances turning on like the fridge would make a loud pop on the speakers. This sometimes occurs even on my computer speakers!! So it's not just the amp that was dying. I had posted about this to a repair forum and they told me to replace all my transistors saying the isolation barrier was degrading and this was a very common thing with time. I didn't bother doing as they said. I was at first convinced it was the Y caps so I tried disconnecting them and it didn't help. That amp is a pile of parts now..

One thing I discovered after it was too late was a few cracked solder joints on the reservoir caps. I was told this these cracked solder joints could act as a sort of rectifier, which made sense, but these line surges shouldnt' be making it that far anyway? Doesn't hurt to make sure all your solder joints are top notch anyway.

Hope you have better luck than I did.

Chris
  Reply With Quote
Old 5th July 2004, 07:53 PM   #9
diyAudio Member
 
Graham Maynard's Avatar
 
Join Date: Dec 2003
Location: UK
Hi Millwood,

Its already been appearing in print in Electronics World. Submitted text is way past 20,000 words already. If you get the chance to read it you'll realise why it is more than I can put in this little window.

Cheers ....... Graham.
  Reply With Quote
Old 5th December 2004, 06:34 PM   #10
whee is offline whee  Norway
diyAudio Member
 
Join Date: Jan 2004
Location: Oslo
Quote:
Originally posted by lucpes
Try using a 250V MOV (Metal Oxide Varistor) paralleled to your mains.
Witch of these is best?

http://www.elfa.se/pdf/60/06029573.pdf


Thanks to all for answers
  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
i get hiss noise when the treble is turn up on high?? prorms Solid State 1 7th April 2008 11:00 PM
Why do people listen to people from the industry?? Magura Everything Else 60 14th April 2004 01:34 AM
How can I reduce mechanical turn on and turn off noise? soundNERD Chip Amps 8 28th October 2003 01:43 AM
turn on noise junglejuice Solid State 5 27th October 2002 06:49 AM


New To Site? Need Help?

All times are GMT. The time now is 08:24 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