Stereo Balanced to Unbalanced Audio Converter

  • Rajkumar Sharma
  • 494
    Views
  • moderate
  • Tested

The primary role of this project is to convert a differential input audio signal into a single-ended output signal while rejecting noise that is common to both inputs (common-mode noise).

The circuit presented here is a differential amplifier intended to receive balanced line inputs in audio applications requiring a high level of noise immunity and optimum common-mode rejection. The circuit typically achieves an extremely high common-mode rejection ratio (CMRR) of 91 dB while maintaining an ultra-low THD+N of –120 dB at 1 kHz for 22-dBu signal levels. Precision matching of on-chip resistors gives the circuit an excellent CMRR performance. Operating supply range +/-12V to +/-15V. Connection of a stereo balanced line input via 2 x female XLRs to a stereo unbalanced output on RCA connectors. The circuit includes D1 power LED, Ferrite beads L1, L2 on the supply line to provide noise immunity. Ferrite Beads at input signals to reduce the RFI/EMI noise.

Features

  • Supply +/-12V to +/-15V DC @ 40mA
  • 2 x Female XLR Connector for Balanced Audio Input
  • 2 x RCA Connector Single-Ended Audio Output
  • EMI circuit on inputs reduce the noise
  • High Input Impedance: 1-MΩ Differential
  • Short-Circuit Protection -Chip
  • D1 Power LED
  • PCB Dimensions 72.07 x 47.47 mm

Schematic

Parts List

NOQNTY.REF.DESCMANUFACTURERSUPPLIERSUPPLIER PART NO
11CN14 PIN MALE HEADERWURTHDIGIKEY732-5317-ND
22CN2,CN4XLR FSWITCH CRAFTDIGIKEYSC1906-ND
32CN3,CN5RCACUI DEVICESDIGIKEYCP-1459-2-ND
46C1,C4,C6,C8,C9,C1110uF/50V SMD SIZE 1206MURATA/YAGEODIGIKEY
52C2,C50.1uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
64C3,C7,C10,C1210uF/50V NON POLARNICHICONDIGIKEY493-10835-3-ND
76C13,C14,C15,C16,C17,C18100PF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
81D1LED SMD SIZE 0805LITE ONDIGIKEY160-1427-1-ND
96L1,L2,R14,R15,R16,R17F-BEAD SMD SIZE 0805TDKDIGIKEY445-6180-1-ND
101R11K 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
117R2,R3,R5,R6,R7,R8,R10100K 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
122R4,R949.9E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
131R110E SMD SIZE 0805MURATA/YAGEODIGIKEY
142R12,R131M 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
151U1INA1650TIDIGIKEY296-45339-1-ND

Connections



Gerber View

Photos

 

Video


INA1650 Datasheet

ina1650

PCB

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