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Old 16th July 2009, 05:41 AM   #911
data is offline data  Australia
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I have these Quad Filar transformers working, but there is a bit of background hiss?

I have 100ohm resistors on the primaries with 1.5n caps across them. The secondaries just have 10k loads across them.

Any suggestions for getting rid of the hiss/buzz, noise?
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Old 16th July 2009, 10:10 PM   #912
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Quote:
Did e-mail digitec too but they never replied.
I think, you will not find a homepage from this Digitec SA, as the company is no longer existing.

Franz
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Old 16th July 2009, 11:37 PM   #913
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Hmm...changed the 100ohm resistors on the primaries to 1k and it is sounding better, but I still have the background noise.
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Old 16th July 2009, 11:46 PM   #914
johnm is offline johnm  United Kingdom
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http://www.digitec.com.ec/

??
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Old 17th July 2009, 03:10 AM   #915
Mush is offline Mush  United States
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Data,
Do you have the output ground (barrel of the RCA outs) attached to the board's signal ground?



I'm not waiting a month for the Edcor 600:600. I'm very fond of the UTC. The Edcor 10k:15k are nice but the UTC are a serious cut above.
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Old 17th July 2009, 04:19 AM   #916
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Hay, mush.

I have the board grounded via the center wire on the voltage input, so the ground comes from the -out from the DAC through the transformers and to the - on the RCA.
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Old 17th July 2009, 04:29 AM   #917
Mush is offline Mush  United States
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Try grounding it the barrels of the on board RCAs.
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Old 17th July 2009, 04:43 AM   #918
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That seems to have helped a bit, the remaining is more than likely a noisy transistor in my amp...

Oh!.........how do I test for DC on the outputs?

Cheers
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Old 17th July 2009, 07:17 AM   #919
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Quote:
Post #914
http://www.digitec.com.ec/
No, not an telecom equipment supplier from Ecuador

Again: it was a french company, producing together with Studer (and later owned by Studer) professional audio equipment in the 90ies and it does not exist anymore.

We recently dumped the old documentation, hundrets of kilo paper. No chance to search for the datasheet, wich was never published before.

Franz
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Old 17th July 2009, 10:12 AM   #920
anbello is offline anbello  Italy
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Hi,
i'am not a transformer expert and i would like to know which is better for this application between this two Edcor transfomers:
XSM600/600 http://www.edcorusa.com/Products/Sho...ct.aspx?ID=327
XS1100 http://www.edcorusa.com/Products/Sho...ct.aspx?ID=547

ciao
andrea
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