very low noise balance to unbalance converter

YUTK · 10th November 2005, 01:51 AM

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

jcx · 10th November 2005, 03:50 AM

very low noise balance to unbalance converter = transformer

YUTK · 10th November 2005, 07:20 AM

Good tranformer it very so expensive

anatech · 10th November 2005, 04:32 PM

It's either a transformer, or SSM2142. A good transformer is better for S/N. A cheap transformer will sound bad.

-Chris

00940 · 10th November 2005, 05:19 PM

A ssm2142 turns a single ended signal into a balanced one. He wants the opposite.

See the TI's INA134.

anatech · 10th November 2005, 05:21 PM

Hi ben,
Sorry, then SSM2141 or SSM2143. Different gain.

-Chris

chrisr · 11th November 2005, 06:55 PM

what happened to connecting one side of the balanced output to ground. wouldn't this be the lowest noise solution?

anatech · 11th November 2005, 07:12 PM

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

RogerGustavsson · 12th November 2005, 03:58 PM

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 .

Steve Eddy · 12th November 2005, 04:58 PM

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

10th November 2005, 01:51 AM	#1
YUTK diyAudio Member Join Date: Jan 2005 Location: BANKKOK	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

10th November 2005, 05:19 PM	#5
00940 diyAudio Member Join Date: Sep 2003 Location: Paris	A ssm2142 turns a single ended signal into a balanced one. He wants the opposite. See the TI's INA134. __________________ Ben.

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10th November 2005, 03:50 AM	#2
jcx diyAudio Member Join Date: Feb 2003 Location: ..	very low noise balance to unbalance converter = transformer

10th November 2005, 07:20 AM	#3
YUTK diyAudio Member Join Date: Jan 2005 Location: BANKKOK	Good tranformer it very so expensive

10th November 2005, 04:32 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	It's either a transformer, or SSM2142. A good transformer is better for S/N. A cheap transformer will sound bad. -Chris

10th November 2005, 05:21 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi ben, Sorry, then SSM2141 or SSM2143. Different gain. -Chris

11th November 2005, 06:55 PM	#7
chrisr diyAudio Member Join Date: Feb 2005 Location: n/a	what happened to connecting one side of the balanced output to ground. wouldn't this be the lowest noise solution?

11th November 2005, 07:12 PM	#8
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

12th November 2005, 03:58 PM	#9
RogerGustavsson diyAudio Member Join Date: Aug 2004 Location: Huskvarna	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 .

12th November 2005, 04:58 PM	#10
Steve Eddy diyAudio Member Join Date: Sep 2002 Location: Sacramento, CA	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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