Balance input with Gain

Circuit with electronic symmetrical input, with possibility of regulation of the gain from the pontesometer RV1 and the level of signal with the RV2. The quality of pontesometer RV1 (as other material), should be very good, in order to we avoid annoying noises and voids in the regulation of gain. Beyond the types IC that I give, it can be used any other type, is enough it fills the characteristics that should, as low noise, distortion etc. With the prices of circuit, the input resistance are near in the 2K?, with result, it's suitable for amplification of low level of signal (Microphone). For higher level signals, it will be supposed it is used attenuation the signal, with resistances, and for the two input sect?on, decreasing with this way, the regulation margins of gain, with the RV1.
Balance input with Gain - schematic

Part List R1-2= 2.2Kohms metal film 1% C1-2= 68pF ceramic OR milar ICI= NE5532 -TL072 R3= 22Kohms metal film 1% C3= 47uF 25V RV1= 10Kohms Log. R4= 6.8Kohmsmetal film 1% C4= 10uF 25V RV2= 47Kohms Log. R5= 100ohms C5-6= 100nF100V cer. OR mkt J1= Female CANNON plug R6-7= 47Kohms C7= 10uF25V .

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