INA134-DRV134 balanced preamp - diyAudio
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Old 30th April 2012, 05:07 PM   #1
raul_77 is offline raul_77  Europe
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Default INA134-DRV134 balanced preamp

I want to build a balanced preamplifier, as I don't need gain I think to use the INA134 and the DRV134, with a volume potentiometer between them.

I can use the suggestions of circuits from the pdf's:

Or I can use this designs:

Electronique - Realisations - Symetriseur audio 006

Electronique - Realisations - Desymetriseur audio 005

The question is that, in the datasheet of the DRV134, say that need be feeding for a low impedance source, so are need a buffer between the potentiometer and the DRV134.

I can made one... as I can made a hole in a box and hold a sepaker, yes, sounds, but the problem is optimize, same thing happens to me with the buffer.

Any suggestions for the design of buffer between the potentiometer and the DRV134? Any scheme? Or someone has the whole scheme of a preamp like this?

As power supply I think use something like this:

Aunt Corey's Homemade Buffered Passive Preamplifier Schematics |

Anticipated thanks.
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Old 1st May 2012, 02:25 PM   #2
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What is the purpose of this preamp? I/O impdances, levels, balanced or not? Do a single-line diagram to enlighten us. E
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Old 1st May 2012, 07:32 PM   #3
raul_77 is offline raul_77  Europe
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Hi mickeymoose,

I have a pair of active monitors and I added balanced outputs to my cd player. All balanced preamplifiers are extremely expensive, so I want to make one.

I have the components to make it, I can just add a potentiometer between the INA134 and DRV134. But I want to do well.

Surely a balanced preamplifier may be of interest to more people, active speakers are good and cheaper than the HiFi speakers, If anyone has any suggestions, please, put it here.

Happy days
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Old 1st May 2012, 11:27 PM   #4
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This schematic of one of the sites you mentioned should work for you: Electronique - Realisations - Preampli micro 007
The SSM2017/2142 are the equivalents to the INA/DRV134. Leave out all the parts needed for the phantom power and replace R5 with a pot to give the desired gain. E
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Old 2nd May 2012, 12:23 AM   #5
gootee is offline gootee  United States
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You should also read Chapter 6 of ADI - Analog Dialogue | Op Amp Applications Handbook

And reading Chapter 7 would be a very good idea, too.
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Old 2nd May 2012, 12:52 AM   #6
tomchr is offline tomchr  Canada
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Have a look at the LME49724. It does exactly what you want and is optimized for audio.

Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits.
Neurochrome : : Audio - - Engineering : : Done : : Right
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Old 3rd May 2012, 01:47 PM   #7
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The LME49724 is a nice part, but where dos t he pot go? E
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Old 4th May 2012, 12:30 AM   #8
raul_77 is offline raul_77  Europe
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Thanks for your responses, but I have in mind simple use a opamp, well adapted to the circuit.

The zip file attached show the basic idea, are for simulated in Tina TI. Tina TI can be download here:

SPICE-Based Analog Simulation Program - TINA-TI - TI Tool Folder

Happy days
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