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Old 6th July 2008, 05:14 AM   #1
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Default Amp power supply

I'm very new at this, so this question may be very stupid.
While researching, I found many circuits for amps and filters that people made where the power supply provided only a positive voltage in addition to ground. I was under the impression that the sound signal from the computer was composed of sine waves, which have both positive and negative components. How can a circuit or chip that only has a positive rail amplify both the positive and negative parts of the signal?
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Old 6th July 2008, 12:36 PM   #2
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By using the ground as the negative rail and creating a virtual ground at half the positive rails voltage.

Nationals application notes usually offer one example of how to do that with a transistor and a few resistors and capacitors. Some ICs, e. g. TDA2030 have that circuitry built in.
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