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Old 7th March 2006, 01:07 PM   #1
roger-k is offline roger-k  Norway
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Default RIAA with balanced output?

I want to build a RIAA-preamp with balanced output,
based on OP-amps.

Do you people know where I can find some schematics
or datasheets with any exemplifyes?

I have find many but not with balanced output.
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Old 26th April 2010, 03:19 PM   #2
FdW is offline FdW  Netherlands
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Maybe this thread can help

Balanced input all DC coupled RIAA preamp

Regards,
Frans de Wit
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Old 26th April 2010, 04:46 PM   #3
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by FdW View Post
Maybe this thread can help

Balanced input all DC coupled RIAA preamp

Regards,
Frans de Wit
Oops, that's wrong, I misread 'input' for 'output', sorry
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Old 26th April 2010, 05:00 PM   #4
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Quote:
Originally Posted by roger-k View Post
I want to build a RIAA-preamp with balanced output,
based on OP-amps.

Do you people know where I can find some schematics
or datasheets with any exemplifyes?

I have find many but not with balanced output.
So you add a balanced line driver like a DRV-134 or SSM2142 or you could just use a dual opamp for each channel with one amp as an inverter. The gains need to be identical so don't forget the gain of the inverting amp is the ratio of the resistors but the non-inverting gain is that same ratio plus 1.

Check out the DRV or SSM datasheets for details using line driver chips.

G
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Old 1st May 2010, 11:27 PM   #5
Yonzie is offline Yonzie  Denmark
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You could use a TI OPA1632 differential opamp.
You can find a schematic on page 21 here (but I haven't checked if the amplification is 1x or something else to better suit the rest of the circuit):
http://focus.ti.com/lit/ug/slau288/slau288.pdf
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