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Dual op amp IC that works at 2.4V


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Hi Xtp,
Opamps don't supply much current. There are some tiny surface-mount power amp ICs for earphones that operate from a low voltage and use a voltage doubler circuit for their power supply. They are nearly impossible to solder.
You could use an MC34119 8-pin ordinary-size IC that has two power amps bridged for fairly high power at a supply voltage down to 2V. I think you will use it with 3V or more for your earphones to be loud enough. ;D


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