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Balanced to unbalanced with op-amp

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arash rezaee

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Hi every one.
How can I convert balanced audio signal to unbalanced signal with simple op-amp like TL072? I search a lot and I tested 2 circuit samples but non of them was acceptable. the balanced input is for example 12volt(P-P) but at the output I have 20volt(p-p). Please let me know if you have a good solution for converting balanced to unbalanced.

Regards
Arash
 

Hi,
an excellent resouce on this is **broken link removed**.
If you want a dedicated device for this purpose see (for example) TI INA134.
 

Hi, Thanks for reply. I Did figure 2 of what you suggested. But steel the output is larger than input. Input is 5volt(p-p) but the output is 15volt(p-p). What should I do? Should I reduce the output by dividing it?
 

If you make an op amp differential input circuit with four equal value resistors it will have a gain of one.
 

The shown differential amplifiers have a gain of 1, that means the differential voltage magnitude is kept. I don't know how you are measuring input voltage, you should measure the differential voltage.

I don't see however, how how you would get a threefold magnitude. I expect a circuit error.
 

Hi. there was a problem with OP-AMP IC. I replace it and every thing is fine. Thanks in advance.
 

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