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Old 21st September 2013, 07:21 PM   #1
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Default "Noisy Transformer (Clicking)"

I'm Building an f5 using an Antek AS-4218 transformer (18V, 400VA). I was hooking up the power supply for testing and the transformer makes a clicking noise that sounds like electricity arcing when my ear is a couple feet away. The clicking has a frequency of a few clicks per second. I unhooked everything but the transformer and it still makes the noise with no load on it. I tried moving the amp to a different outlet and the noise is still there. I sent Antek an e-mail a couple days ago but haven't heard back.
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Old 21st September 2013, 07:55 PM   #2
kevinkr is offline kevinkr  United States
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The clicking could be symptom of a mains transient issue or an intermittent internal connection, or maybe internal arcing between a winding.

Do you have any other toroids, and if so are they silent when plugged into the same outlet?

Do you have a scope?

I've used a lot of Antek transformers in my projects over the course of nearly a decade and have not had a problem with any of their transformers. QC problems seem quite rare.
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Old 21st September 2013, 08:59 PM   #3
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I have an EI transformer which I hooked up and it makes the same clicking noise. (should have tried that earlier).

Yes I have scope, but what am I looking for.
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Old 21st September 2013, 09:10 PM   #4
kevinkr is offline kevinkr  United States
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Take a look at the secondary and see what happens when you get that clicking. You should see some sort of pulse.

This indicates that the Antek is ok, and problem lies either in your house wiring or something nearby. Something arcing on a regular basis could cause this sort of behavior and could be a cause for serious concern.

Single family house you own, condo, apartment?

May want to consult with the local power company and an electrician.
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Old 21st September 2013, 10:00 PM   #5
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It's a single family house that we own.

I'm realizing there is a problem with the electricity in the house. I'm sure there's nothing wrong with the transformer. Maybe this thread should be deleted.

Now that I'm aware of it I can hear the clicking on the stereo if I turn it all the way up. I can hear it in the TV as well.

I'm thinking it must be something outside the house because I can turn off all the breakers except the one with the stereo on it and still hear the clicking.
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Old 21st September 2013, 10:04 PM   #6
kevinkr is offline kevinkr  United States
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Definitely time to contact the power company, they should be able to figure out the source of this interference. It might be something wrong on the high voltage side of your local distribution system.

In terms of diagnostics technique this is a useful thread I think. Might want to move it somewhere else.. I think power supplies and if you select a new name I can make that happen if you PM me.
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Old 22nd September 2013, 12:11 AM   #7
kevinkr is offline kevinkr  United States
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KevinHeem and I discussed this privately and we thought there might be some useful information here for others, so this was moved from the Pass Labs Forum to here.
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Old 22nd September 2013, 01:19 PM   #8
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Do you still have a battery powered AM radio? If so tune it off-channel near the low end of the band and walk around your neighborhood near the power company's poles. It could be a high-voltage insulator arcing.
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Old 22nd September 2013, 09:26 PM   #9
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It could be medical, check if your partner can hear it.
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Old 23rd September 2013, 10:14 AM   #10
AndrewT is offline AndrewT  Scotland
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Is this a single blind test, or a double blind test?

The results could be declared invalid by those that like to argue.
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