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Old 10th November 2005, 01:51 AM   #1
YUTK is offline YUTK  Thailand
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Default very low noise balance to unbalance converter

I design Amplifier with current feedback topology ,by this topology I can't use mode balance differential input and now I looking for very low noise balance to unbalance converter if any body have solution pls help
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Old 10th November 2005, 03:50 AM   #2
jcx is offline jcx  United States
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very low noise balance to unbalance converter = transformer
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Old 10th November 2005, 07:20 AM   #3
YUTK is offline YUTK  Thailand
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Good tranformer it very so expensive
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Old 10th November 2005, 04:32 PM   #4
anatech is offline anatech  Canada
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It's either a transformer, or SSM2142. A good transformer is better for S/N. A cheap transformer will sound bad.

-Chris
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Old 10th November 2005, 05:19 PM   #5
00940 is offline 00940  Belgium
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A ssm2142 turns a single ended signal into a balanced one. He wants the opposite.

See the TI's INA134.
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Ben.
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Old 10th November 2005, 05:21 PM   #6
anatech is offline anatech  Canada
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Hi ben,
Sorry, then SSM2141 or SSM2143. Different gain.

-Chris
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Old 11th November 2005, 06:55 PM   #7
chrisr is offline chrisr  United States
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what happened to connecting one side of the balanced output to ground. wouldn't this be the lowest noise solution?
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Old 11th November 2005, 07:12 PM   #8
anatech is offline anatech  Canada
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Hi chrisr,
That depends. Many sources are active these days. Grounding one side would create lot's of distortion and crosstalk. If the other end were transformer coupled then, maybe. You would eliminate the noise cancellation that is one of the big benefits of balanced lines.

-Chris
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Old 12th November 2005, 03:58 PM   #9
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The subject is balanced to unbalanced? If noise cancelling is wanted it is the receiving end that needs to be differential. The sending end is of less importance. Please, take o look at www.jensen-transformers.com/an/an003.pdf .
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Old 12th November 2005, 04:58 PM   #10
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If you want some good quality transformers at flea market prices, look around for some old Altec/Peerless 15335As. I've seen them on eBay for less than $10. These are a 1:1 15k:15k bridging transformer and of very good quality.

If you can't find any or it's still not cheap enough for you, just make a simple XLR to RCA adaptor cable. Center pin of RCA to XLR pin 2 (or 3 depending how it's wired for positive versus negative) and the ground of the RCA to XLR pin 1. If you're using a shielded cable, terminate the shield only at pin 1 on the XLR end.

Done deal. No chips. No power supplies. No hassle.

se
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