So, I have successfully made a mono TDA2030 amplifier using a single-power-supply which worked flawlessly without any noise. But when I tried to design a stereo circuit with 2 TDA 2030 ICs, both of the speakers are having very high noise . Here is the circuit I have tried.


simulate this circuit – Schematic created using CircuitLab

Please note that the both TDA 2030 circuits given above, are connected to a 12-0 volt DC (Non center tapped Transformer with full bridge rectifier) not 12-0-12.

So, where did I make a mistake? Please point me the mistake with proper schematic and markings also please describe the issue.

Thanks for your precious time...

  • 3
    \$\begingroup\$ bypass and decoupling on 12vdc?? \$\endgroup\$
    – Pete W
    Jan 23, 2021 at 16:12
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    \$\begingroup\$ Download the data sheet and read it. You will find it is very susceptible to feedback and that the output needs to have a filter network. Pay attention to the section labeled practical considerations especially decoupling. If the power supply is not well decoupled it will feed back by that route as well. There are DC bias requirements you are not meeting. Try again but use there schematic and add more decoupling. \$\endgroup\$
    – Gil
    Jan 23, 2021 at 16:24
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    \$\begingroup\$ You are using the negative supply rail as also your signal ground reference and that means the signal ground reference rail is also carry large speaker currents. That means, trouble unless you know how to properly stop signal tracks carrying speaker currents. With + and - supplies, signal ground is isolated from a rail that carries speaker currents much more easily. \$\endgroup\$
    – Andy aka
    Jan 23, 2021 at 18:07
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    \$\begingroup\$ @Subha Jeet Sikdar -- I mean capacitors to stiffen the supply voltage to each active device \$\endgroup\$
    – Pete W
    Jan 23, 2021 at 18:57
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    \$\begingroup\$ "So, where did I make a mistake?" some aspects of your circuit are not good, but your 'mistake' may actually be in the construction. Please show us a photo of the setup, showing all wiring. \$\endgroup\$ Jan 23, 2021 at 19:27


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