need help with audio isolation transformers

azira · 18th June 2004, 02:58 AM

I have my VCR, XBOX, PS2 and Gamecube connected to my receiver through a switchbox. It hums pretty loudly so I got to thinking that maybe I have a ground loop issue. So I want to put together a couple audio isolation transformers inbetween the RCA connectors and see if that solves the problem. The trouble is that the only ones I can find are these from Radio Shack.

http://www.radioshack.com/product.as...ct_id=273-1374

They freq response on those kind of sucks. Would it be better if I put two in series? Or where can I find some better ones?
thanks.
--
Danny

li_gangyi · 18th June 2004, 03:12 AM

you could try finding the groudloop by eliminating each source slowly, it would get you to your goal without the expense of using an isolation transformer...a suitably rated one with good response would be hard to come by and expensive...

serengetiplains · 18th June 2004, 04:30 AM

Here's a transformer for you. $250 starting price, and current headroom galore:

Yowsa

li_gangyi · 18th June 2004, 04:36 AM

lolx...the only problem is that it ain't an Audio transformer...or maybe iut will work to 60Hz...

serengetiplains · 18th June 2004, 04:44 AM

On a more serious note, here's one you might consider. Xentek transformers look to me like repackaged MGE Topaz transformers and in any event give you about 150dB isolation. This one's rated at 1kVA and is plug and PLAY:

Pick Me!

Happy gaming.

azira · 18th June 2004, 03:19 PM

So maybe I worded what I'm looking for wrong... When we had these problems in my band, we throw on a DI box and click the ground lift switch.

I could buy a pair of Behringer Ultra-DI boxes with FR from 10Hz-93KHz for $32/ea but I gotta believe that the transformers alone are cheaper than that...

http://cgi.ebay.com/ws/eBayISAPI.dll...730163745&rd=1

I'm not looking for AC line filters, I'm looking for a 1:1 transformer that I put between the RCAs coming out of my switchbox and the RCAs going into my amplifier...
--
Danny

serengetiplains · 18th June 2004, 04:16 PM

Danny, take a look at this thread. Might help.

input transformers

SY · 18th June 2004, 04:19 PM

You absolutely want to read and understand Bill Whitlock's papers on the Jensen Transformers site. IIRC, there was one in particular on troubleshooting ground loops.

Steve Eddy · 18th June 2004, 05:40 PM

Quote:

Originally posted by SY
You absolutely want to read and understand Bill Whitlock's papers on the Jensen Transformers site. IIRC, there was one in particular on troubleshooting ground loops.

That would be this one: Hum & Buzz in Unbalanced Interconnect Systems

se

azira · 18th June 2004, 09:44 PM

Thanks everyone for some good tips. I'll have to reevaluate my system and see what I've done.

18th June 2004, 02:58 AM	#1
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	need help with audio isolation transformers I have my VCR, XBOX, PS2 and Gamecube connected to my receiver through a switchbox. It hums pretty loudly so I got to thinking that maybe I have a ground loop issue. So I want to put together a couple audio isolation transformers inbetween the RCA connectors and see if that solves the problem. The trouble is that the only ones I can find are these from Radio Shack. http://www.radioshack.com/product.as...ct_id=273-1374 They freq response on those kind of sucks. Would it be better if I put two in series? Or where can I find some better ones? thanks. -- Danny

18th June 2004, 03:12 AM	#2
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	you could try finding the groudloop by eliminating each source slowly, it would get you to your goal without the expense of using an isolation transformer...a suitably rated one with good response would be hard to come by and expensive... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

18th June 2004, 04:36 AM	#4
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	lolx...the only problem is that it ain't an Audio transformer...or maybe iut will work to 60Hz... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

18th June 2004, 04:19 PM	#8
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You absolutely want to read and understand Bill Whitlock's papers on the Jensen Transformers site. IIRC, there was one in particular on troubleshooting ground loops. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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18th June 2004, 04:30 AM	#3
serengetiplains diyAudio Member Join Date: Feb 2004 Location: Canada	Here's a transformer for you. $250 starting price, and current headroom galore: Yowsa

18th June 2004, 04:44 AM	#5
serengetiplains diyAudio Member Join Date: Feb 2004 Location: Canada	On a more serious note, here's one you might consider. Xentek transformers look to me like repackaged MGE Topaz transformers and in any event give you about 150dB isolation. This one's rated at 1kVA and is plug and PLAY: Pick Me! Happy gaming.

18th June 2004, 03:19 PM	#6
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	So maybe I worded what I'm looking for wrong... When we had these problems in my band, we throw on a DI box and click the ground lift switch. I could buy a pair of Behringer Ultra-DI boxes with FR from 10Hz-93KHz for $32/ea but I gotta believe that the transformers alone are cheaper than that... http://cgi.ebay.com/ws/eBayISAPI.dll...730163745&rd=1 I'm not looking for AC line filters, I'm looking for a 1:1 transformer that I put between the RCAs coming out of my switchbox and the RCAs going into my amplifier... -- Danny

18th June 2004, 04:16 PM	#7
serengetiplains diyAudio Member Join Date: Feb 2004 Location: Canada	Danny, take a look at this thread. Might help. input transformers

18th June 2004, 09:44 PM	#10
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	Thanks everyone for some good tips. I'll have to reevaluate my system and see what I've done.

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