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7/5/2019 6:03:58 AM
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Back in the early days of radio, 60 cycle hum was a problem  because of insufficient power supply filtering getting in the audio stages of the vacuum tube radio.  Someone cleverly injected an out-of-phase 60 cycle signal in series with the speaker drive called a hum-bucking-coil.

Don't forget the most popular technique invented by Alexander Bell and widely used today, twisted wires.

A few others: current mirrors, diffrential amplifiers, using a diode to compensate for a base-emitter voltage

On the mechanical side, don't grandfather clocks use a combinaton of alloys and linkages in the pendulum to keep the length constant over temperature?


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