Antiparallel diodes as power line filter : how do they work ??

ygg-it · 4th July 2008, 06:47 AM

Please check the following schema with two antiparallel diodes for both power line conductors (on the left)

http://www.degenonline.de/hifi/index.html#dcfilter

The purpose is to create a power line audio conditioner.
I tryed by myself and it changes dramatically the soundstage (not better, not worse, just change...)

But I don't understand:
1) how they works
2) do capacitor in parallell useful. Which value ?
3) the wave spectrogram of 50 Hz power line doen't change, nor the THD nor the SNR so I relly don't understand how the work.

Probably, I think they should not coduct in the crossover part (+- 0,7 volt)?? So in that time period the trasformers doesn't work??

Can you please clarify?

Mooly · 4th July 2008, 06:52 AM

Hi,
Seen this kind of thing before. The idea is to prevent any DC on the mains (harmonics etc that are causing the mains to be non sinusoidal) from causing magnetizing currents in the transformer primary. I think the main reason is to try and stop trannies buzzing under said conditions.
Never tried it

Christer · 4th July 2008, 07:04 AM

The purpose of the capacitors are to block any DC component om the mains.

Usually the DC component is very low voltage so the diodes will not conduct, but if there is too much DC, they will conduct to protect the capacitors. Of course, the filter no longer blocks the DC if there is so much DC that the diodes conduct.

4th July 2008, 06:47 AM	#1
ygg-it diyAudio Member Join Date: Feb 2008	Antiparallel diodes as power line filter : how do they work ?? Please check the following schema with two antiparallel diodes for both power line conductors (on the left) http://www.degenonline.de/hifi/index.html#dcfilter The purpose is to create a power line audio conditioner. I tryed by myself and it changes dramatically the soundstage (not better, not worse, just change...) But I don't understand: 1) how they works 2) do capacitor in parallell useful. Which value ? 3) the wave spectrogram of 50 Hz power line doen't change, nor the THD nor the SNR so I relly don't understand how the work. Probably, I think they should not coduct in the crossover part (+- 0,7 volt)?? So in that time period the trasformers doesn't work?? Can you please clarify? __________________ My projects (G.G. Italy)

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4th July 2008, 06:52 AM	#2
Mooly diyAudio Member Join Date: Sep 2007	Hi, Seen this kind of thing before. The idea is to prevent any DC on the mains (harmonics etc that are causing the mains to be non sinusoidal) from causing magnetizing currents in the transformer primary. I think the main reason is to try and stop trannies buzzing under said conditions. Never tried it

4th July 2008, 07:04 AM	#3
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	The purpose of the capacitors are to block any DC component om the mains. Usually the DC component is very low voltage so the diodes will not conduct, but if there is too much DC, they will conduct to protect the capacitors. Of course, the filter no longer blocks the DC if there is so much DC that the diodes conduct.

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