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Zedman
Joined: 13 Oct 2003
Posts: 281
Helped: 2
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 23 Jul 2004 12:02 Balanced audio signal with OpAmps |
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I would like to get balanced audio signal from
unbalanced and transmit it with UTP cable's
twisted pairs over 60-100 meters.
I can't get balun transformers here in the stores,
or if they have, it's in the price of gold...
I found these schematics with OpAmps, and would
like to know if they work? Will they work with
single supply OpAmps (LM358 for example)?
thanks in advance,
Zed
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batdin
Joined: 03 Jun 2004
Posts: 181
Helped: 3
Location: Bulgaria
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| 23 Jul 2004 20:02 Re: Balanced audio signal with OpAmps |
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It should work.
I would use a simpler differential amp at the receiving end.
I would also use dual voltage power supply to simplify the design.
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Zedman
Joined: 13 Oct 2003
Posts: 281
Helped: 2
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| 26 Jul 2004 9:25 Balanced audio signal with OpAmps |
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As I know LM358 is has internal biasing, will it need
more external parts?
Can you please show me the simplier design you
mentoined for the receiver?
thanks,
Zed
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FoxyRick
Joined: 09 Jan 2004
Posts: 598
Helped: 35
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| 26 Jul 2004 11:28 Re: Balanced audio signal with OpAmps |
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Texas Instuments make a couple of opamps intended for balanced audio - see here:
Line Driver: http://focus.ti.com/docs/prod/folders/print/drv134.html
Line Receiver: http://focus.ti.com/docs/prod/folders/print/ina2137.html
Hope this helps,
FoxyRick.
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Zedman
Joined: 13 Oct 2003
Posts: 281
Helped: 2
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| 26 Jul 2004 14:31 Re: Balanced audio signal with OpAmps |
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Thanks FoxyRick,
but i need to go cheap, because I have to put it
in 60 to 100 clients, and the opamp version seems
8 times cheaper according to the stores here 
But the INA2137 seems to be a good solution for
the receiver side (there will be just 1 receiver).
any other ideas?
thanks in advance,
Zed
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aslak
Joined: 04 Nov 2001
Posts: 29
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| 27 Jul 2004 6:44 Re: Balanced audio signal with OpAmps |
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Hi,
SSM2142 driver from Analog Devices is a complete solution. Check also:
http://www.jensen-transformers.com/an/an003.pdf.
Regards,
Aslsk
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