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-   -   Humming toriodal transformer....? (http://www.diyaudio.com/forums/solid-state/234897-humming-toriodal-transformer.html)

Fusion916 26th April 2013 09:28 PM

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?

pdul 26th April 2013 09:35 PM

you probably need a dc trap on the mains side (primary) the humming is from dc in your mains supply:)

pdul 26th April 2013 09:39 PM

two anti paralell diodes paralell to a big electrolytic capacitor, and in series with the live wire just before the toriodal should solve it.

Fusion916 26th April 2013 09:41 PM

Quote:

Originally Posted by pdul (Post 3469553)
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?

Fusion916 26th April 2013 09:45 PM

Nevermind I just googled the schematic of a DC trap, I'll give it a try, thanks.

pdul 26th April 2013 10:11 PM

1 Attachment(s)
sorry i had to visit the boys room:D

Fusion916 26th April 2013 10:45 PM

PTC used to limit inrush?

pdul 26th April 2013 11:10 PM

Yes. What are you using the toroidial for?

audiostar 27th April 2013 12:23 AM

Audio by Van Alstine AVA HumDinger DC Blocker.

Fusion916 27th April 2013 12:48 AM

Quote:

Originally Posted by pdul (Post 3469604)
Yes. What are you using the toroidial for?

Class A amp.


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