I made an audio amplifier with a 6283 IC.

When I power the amplifier with a 12V battery it works fine without any hum.

When I power the amplifier amp with a 12V powered transformer, hum comes from speaker from the transformer.

  • What should I do?
  • How do I fix the hum from the amplifier?
  • 6
    \$\begingroup\$ Please post schematics of everything you made, and if you're really nice, a link to the datasheet as well. Your question will be more likely to be answered. \$\endgroup\$ – Ananas_hoi Dec 17 '20 at 9:03
  • 1
    \$\begingroup\$ You likely need to add a big capacitor after your rectifier. The hum IMO is probably "ripple". electronics-tutorials.ws/diode/diode_6.html \$\endgroup\$ – Kyle B Dec 17 '20 at 9:27
  • \$\begingroup\$ Big meaning upwards of 1000uF, and keep increasing it until the hum is as low as you want. \$\endgroup\$ – user_1818839 Dec 17 '20 at 12:18

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