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??
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??
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.
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.
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.
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.
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.
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.
Graham Maynard said:
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?
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
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
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.
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.
lucpes said:
Witch of these is best?
http://www.elfa.se/pdf/60/06029573.pdf
Thanks to all for answers🙂🙂
I have a loud "pop" everytime a fluorescent light in the next room gets turned on or off.Doesn't matter which amp I'm using,I always hear it.
I've tried: A decent homebrew power filter built in a 6-outlet strip, a R/C (100 ohms .01uf) across the switch,varistors,etc..
It's always there and I can't get it to go away!
The only thing I havn't tried is replacing the fixture,which may happen soon.
Beware of fluorescent lights,and dimmers,they are noisy creatures!
Infact,a few weeks ago a friend was over and we were playing with something on the scope,and we could see noise on the trace from all the dimmers around the house! just a "notch" on the 60hz background noise..the "notch" would move up and down theside of the sine wave depending on the brightness setting of the dimmer.
I've tried: A decent homebrew power filter built in a 6-outlet strip, a R/C (100 ohms .01uf) across the switch,varistors,etc..
It's always there and I can't get it to go away!
The only thing I havn't tried is replacing the fixture,which may happen soon.
Beware of fluorescent lights,and dimmers,they are noisy creatures!
Infact,a few weeks ago a friend was over and we were playing with something on the scope,and we could see noise on the trace from all the dimmers around the house! just a "notch" on the 60hz background noise..the "notch" would move up and down theside of the sine wave depending on the brightness setting of the dimmer.
Hi.
I hear this "pop"noise when lights, which are switched by an "Current draw switch"[stromstoßschalter, Eltako, i don't know the right word], are turned on or off
karahara
I hear this "pop"noise when lights, which are switched by an "Current draw switch"[stromstoßschalter, Eltako, i don't know the right word], are turned on or off
karahara
I had this problem on my computer speakers
try to place a ferrite core around the mains cable, and the same with the input cable (if the cable is thin enough, make some turns around the ferrite)
it worked for me
try to place a ferrite core around the mains cable, and the same with the input cable (if the cable is thin enough, make some turns around the ferrite)
it worked for me
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