Differential output

Keruskerfuerst · 19th June 2007, 12:29 PM

I have a audio power amp with a symetrical input.

What´s the best way to turn a asymetrical output into a symetrical output?

I known the integrated line drivers like BB OPA134PA and Analog Devices SSM2142.

Fox · 21st June 2007, 11:12 AM

With a transformer (e.g. Lundahl).

Gordy · 17th July 2007, 11:03 PM

If you do not want to use a transformer as suggested, and still need an answer at this time, I suggest posting a question in the Solid State section of the forum.

LineSource · 18th July 2007, 12:25 AM

I've used three different solutions:

1) Turn your symmetrical input amp into a single ended input by grounding one of the inputs(typically the inverting, but check your owner's manual). If you are using short interconnect cables this solution is often the best sounding....no junk in the signal path. Some amps do not really use a true symmetrical circuit topology, and put an extra diff-amp in front of their "real" amp to support symmetrical inputs from PRO audio(long cable folks). Check your owner's manual.

2) Use a BB OPA134PA opamp, or you can find a couple JFET input and bipolar output circuits with a DIYaudio search. I've build a couple myself. Never use two ordinary opamps in series to create + and - polarity.

3) Use a transformer for both isolation and symmetrical signal generation. JENSON has several application notes on the topic. This is common in PRO audio.

19th June 2007, 12:29 PM	#1
Keruskerfuerst diyAudio Member Join Date: May 2007	Differential output I have a audio power amp with a symetrical input. What´s the best way to turn a asymetrical output into a symetrical output? I known the integrated line drivers like BB OPA134PA and Analog Devices SSM2142. __________________ Houston, we have a problem!

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21st June 2007, 11:12 AM	#2
Fox diyAudio Member Join Date: Dec 2002 Location: The Netherlands	With a transformer (e.g. Lundahl).

17th July 2007, 11:03 PM	#3
Gordy diyAudio Member Join Date: Nov 2006	If you do not want to use a transformer as suggested, and still need an answer at this time, I suggest posting a question in the Solid State section of the forum.

18th July 2007, 12:25 AM	#4
LineSource diyAudio Member Join Date: Sep 2003 Location: SiliconValley	I've used three different solutions: 1) Turn your symmetrical input amp into a single ended input by grounding one of the inputs(typically the inverting, but check your owner's manual). If you are using short interconnect cables this solution is often the best sounding....no junk in the signal path. Some amps do not really use a true symmetrical circuit topology, and put an extra diff-amp in front of their "real" amp to support symmetrical inputs from PRO audio(long cable folks). Check your owner's manual. 2) Use a BB OPA134PA opamp, or you can find a couple JFET input and bipolar output circuits with a DIYaudio search. I've build a couple myself. Never use two ordinary opamps in series to create + and - polarity. 3) Use a transformer for both isolation and symmetrical signal generation. JENSON has several application notes on the topic. This is common in PRO audio.

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