I have finished my amplifier using the LA4597 chip following the schematic below. So far everything's working fine.

However, I noticed something. Some songs crackle the speakers (probably because of their frequencies). But if I disconnect one speaker, the crackling sounds disappear on the other. I tested it to both of the speakers to check if one of them is blown or damaged but nope, both speakers sounded clean whenever the other one is disconnected. Btw, the volume was the same on every test that I did.

What is happening? Can this be resolved?


  • 4
    \$\begingroup\$ Show the schematic! \$\endgroup\$ – Olin Lathrop Sep 26 '18 at 11:53
  • 1
    \$\begingroup\$ Are the inputs connected to your audio source through 10uF capacitors? What is the AC input voltage reaching each channel? It helps to have a frequency generator for testing. \$\endgroup\$ – rdtsc Sep 26 '18 at 12:14
  • 3
    \$\begingroup\$ My first guess is your power supply cannot supply the current to drive both speakers. Does it happen only at high volume? \$\endgroup\$ – Janka Sep 26 '18 at 12:36
  • 3
    \$\begingroup\$ Perceived loudness doesn't necessarily equate to power needed. Also 12VDC doesn't say anything about the power it can deliver, What amp can it support? \$\endgroup\$ – ratchet freak Sep 26 '18 at 13:18
  • 1
    \$\begingroup\$ Put 10uF caps between both inputs and see if it helps. \$\endgroup\$ – rdtsc Sep 26 '18 at 17:30

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.