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Old 26th April 2013, 09:28 PM   #1
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Default Humming toriodal transformer....?

Is it "normal" for a toriodal to hum when turned on and drawing high current? Any methods of preventing this humming to couple onto the output?
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Old 26th April 2013, 09:35 PM   #2
pdul is offline pdul  Denmark
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you probably need a dc trap on the mains side (primary) the humming is from dc in your mains supply
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Old 26th April 2013, 09:39 PM   #3
pdul is offline pdul  Denmark
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two anti paralell diodes paralell to a big electrolytic capacitor, and in series with the live wire just before the toriodal should solve it.
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Old 26th April 2013, 09:41 PM   #4
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Quote:
Originally Posted by pdul View Post
two anti paralell diodes paralell to a big electrolytic capacitor, and in series with the live wire just before the toriodal should solve it.
Can you post a ms-paint schematic? IM not sure what you mean by anti-parallel diodes. Do you mean back to anode to cathode and cathode-to-annode?
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Old 26th April 2013, 09:45 PM   #5
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Nevermind I just googled the schematic of a DC trap, I'll give it a try, thanks.
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Old 26th April 2013, 10:11 PM   #6
pdul is offline pdul  Denmark
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sorry i had to visit the boys room
Attached Files
File Type: pdf Main DC Filter 10 variations[1].pdf (61.4 KB, 189 views)
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Old 26th April 2013, 10:45 PM   #7
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PTC used to limit inrush?
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Old 26th April 2013, 11:10 PM   #8
pdul is offline pdul  Denmark
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Yes. What are you using the toroidial for?
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Old 27th April 2013, 12:23 AM   #9
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Audio by Van Alstine AVA HumDinger DC Blocker.
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Old 27th April 2013, 12:48 AM   #10
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Quote:
Originally Posted by pdul View Post
Yes. What are you using the toroidial for?
Class A amp.
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