One example of use is on bridged amplifiers, where there are two amplifiers 180º out of phase supplying the signal to a common speaker. Both outputs are connected to the speaker that way. The purpose of this is to have twice the gain of each amplifier and the output power doubled, keeping the supply voltage low.Why have to produce a 180 degrees out of phase with the input signal? What is the usage?
Can I bring to your attention the section on negative feedback in Volume III: http://www.allaboutcircuits.com/vol_3/chpt_8/4.htmlWhat is the function of Inverting amplifier?
Why negative feedback is required?
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