Amp power supply

siming.guo · 6th July 2008, 04:14 AM

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?

pacificblue · 6th July 2008, 11:36 AM

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.

6th July 2008, 04:14 AM	#1
siming.guo diyAudio Member Join Date: Jun 2008	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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6th July 2008, 11:36 AM	#2
pacificblue diyAudio Member Join Date: May 2008	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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