DIY AC Line Filter & Surge Supressor

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Beitrag

msb1
Stammgast

#1 erstellt: 13. Feb 2007, 09:10

Here are some photos of an AC Line Filter & Surge Supressor I built. It has 2 dedicated AC Lines from the main distribution board and 2 seperate filter circuits - 1 for the Digital and 1 for everything else.

The basic design and schematic is from Jon Risch:

http://www.geocities.com/jonrisch/surge.htm

The parts and connectors are all cryogenically treated and sourced
from:

www.cryo-parts.com

The results of adding this filter were tremendous with darker and much quieter backgrounds (due to reduced EMI and RF). It also lowered the noise floor and firmed up the low and mid sections. The circuit also offers very good surge suppression and protection.

This is a project worth undertaking but since there is lethal volatge involved, please make absolutely sure you know what you are doing!!

paj4x4
Ist häufiger hier

#2 erstellt: 13. Feb 2007, 09:39

Great stuff msb1! Quite impressive. Build quality looks solid.

How long did it take you to build the unit? Any plans to sell it commercially? I'd be interested to get 2 units

msb1
Stammgast

#3 erstellt: 13. Feb 2007, 09:52

Hi, I had the box made by a carpenter out of solid wood. Everything else was done by me. Took about 1/2 a day to fit and wire. Been over a year now since I built it.

Unfortunately don't have time to make them commercially. Also, getting all the parts together was a bit of a pain. I think Lee at cryo-parts.com has some parts for sale. You can contact him.

Amp_Nut
Inventar

#4 erstellt: 13. Feb 2007, 19:36

Hi msb.

Where are you located ?

If in Mumbai, I would love to audition it...

paj4x4
Ist häufiger hier

#5 erstellt: 14. Feb 2007, 06:47

Hi msb1. Noted and understood. If you'll oblige Amp_Nut's request I'd be glad to join in. I'm also based in Mumbai.

CR

msb1
Stammgast

#6 erstellt: 14. Feb 2007, 07:08

Don't live in Mumbai. Am originally from Mumbai but live way up North in Amritsar since the last 5-6 years.

ani
Stammgast

#7 erstellt: 14. Feb 2007, 08:11

Hi,

Nice job MSB, are you using it for your power amps too?

AmpNut I am using a filter based on Elektor design for source and pre. It makes use of a current balanced inductor(common mode choke), so for balanced current there is no inductance. It has given good results for me and like any power conditioning the equipment and quality of input power do play major role.

If you are interested I can send you the schematic diagram and my construction details.

Regards

Anil

[Beitrag von ani am 14. Feb 2007, 08:16 bearbeitet]

msb1
Stammgast

#8 erstellt: 14. Feb 2007, 08:41

4 outputs - 1 to CDP, 1 to Pre and 2 to monoblock power amps. I have bypassed the inductors for the outputs to the power amps. This is to prevent loss of dynamics as inductors are known to 'choke' the AC.

Also I am using Icepower based amps which benifit from balanced AC power. I am getting a balanced transformer made which will be placed afer the filter. If sucessful will make one for the digital as well.

Here's some more data on balanced power supply:

http://www.equitech.com/articles/widescreen.html

http://www.equitech.com/articles/bpng.html

http://www.equitech.com/articles/articles.html

Anil, post your schematic.

Behram
Ist häufiger hier

#9 erstellt: 14. Feb 2007, 09:54

Having gone thru these articles, have a query. Will any centre tap secondary transformer do or is there a special "bifilar winding" technology transformer available ?

Also if more than one audio / source equipment is plugged in, the reactive currents may then interfere with one another, in that case do RF filters require to be plugged in series of each of these mains outlets.

Behram.

msb1
Stammgast

#10 erstellt: 14. Feb 2007, 10:09

Hi Behram,

From my understanding the basic requirement is that the opposite legs should be out of phase of each other. I spoke to a local transformer manufacturer and he says that is the case on any centre tapped AC tranformer. Since these are pretty inexpensive, I have asked him to make a small 100W one (110 - 0 -110) and will get it checked on an oscilloscope. Will report.

I assume the reactive currents go to ground (centre tap) which is connected to a physical earth point. In my case I have a dedicated earth for my audio setup. However, if this may be an issue you can use multiple transformers given that the cost factor is not high.

Here's a DIY link for this:

http://www.geocities.com/jonrisch/catch2.htm

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