Ground Isolation Audio Amplifier for Automotive Applications

  • Rajkumar Sharma
  • 221 Views
  • moderate
  • Tested
  • SKU: EL135434
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This Ground Isolation Amplifier is developed for car and automotive applications. The board efficiently eliminates problems caused by wiring resistance and removes noise generated by other electrical devices used in automobile environment. In a car or automotive the audio system is grounded to the car body. For this reason, electrical noise generated by the car electrical system can enter the power amplifier input through the chassis and become audible. The BA3123F utilizes the common-mode rejection characteristics of an OPAMP to eliminate this noise. 4 x RCA connectors are provided for easy audio interface. 2x pin header connector is provided for chassis ground.

Features

  • Power Supply 4V to 18V DC
  • Quiescent Current 9mA
  • High Common-mode Rejection Ratio(1Khz) 57dB
  • Low Noise
  • Low Distortion THD 0.002% (Vout 0.7V)
  • Frequency Response 20Hz to 20Khz
  • PCB Dimensions 58.58 x 41.28mm
  • 4 x 2.5mm Mounting Holes

Connections and Other Details

  • CN1: Pin 1,2 = VCC 4V to 18V, Pin 3,4=GND
  • CN2: Connect it to Car Chassis
  • CN3: Connect it to Car Chassis
  • J1: RCA Female Audio Output (Right Channel)
  • J2: RCA Female Audio Output (Left Channel)
  • J3: RCA Female Audio Input (Left Channel)
  • J4: RCA Female Audio Input (Right Channel)
  • D1: Power LED

Schematic

Parts List

NOQNTY.REF.DESC.MANUFACTURERSUPPLIERSUPPLIER'S PART NO
11CN14 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5317-ND
21CN22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
31CN32 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
44C1,C4,C7,C84.7uF/35V SMD ELECTROLYTICPANASONICDIGIKEYPCE4296CT-ND
51C2100uF/25V SMD ELECTROLYTICUNITEC CHEMIDIGIKEY565-EMVE250ARA101MF80GCT-ND
61C3100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
71C522uF/25V SMD ELECTROLYTICNICHICONDIGIKEY493-10060-1-ND
81C610uF/35V SMD ELECTROLYTICUNITEC CHEMIDIGIKEY565-EMVH350ARA100MF60GTR-ND
91D1LED RED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
104J1,J2,J3,J4RCA JACKCUI AUDIODIGIKEYCP-1418-ND
111R147E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
121R21K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
131R3620E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
143R4,R6,R80E SMD SIZE 0805YAGEO/MURATADIGIKEY
152R5,R71.8K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
161U1BA3123 SOIC8ROHMDIGIKEY846-BA3123F-E2TR-ND

Application Diagram

Connections

Gerber View

Photos

Video

BA3123F Datasheet

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