06-06-2017, 01:46 PM
The output power will always be less than the power input from the supply simply because of conservation of energy.
Beyond that there are limitations for each type of circuit. For example a Class A amplifier where the valve(s) or transistor(s) are always conducting can never be more than 50% effiicient. That's at full output. At zero output the efficiency is zero. Class B is much better and some switching amplifiers (class D etc) can approach 100% efficiency.
Finally no amplifier will achieve the theoretical maximum effiiciency for its type due to imperfect components. Such as ordinary ohmic losses in the output transformer.
This article is quite good: http://www.audioholics.com/audio-amplifi...er-classes
Beyond that there are limitations for each type of circuit. For example a Class A amplifier where the valve(s) or transistor(s) are always conducting can never be more than 50% effiicient. That's at full output. At zero output the efficiency is zero. Class B is much better and some switching amplifiers (class D etc) can approach 100% efficiency.
Finally no amplifier will achieve the theoretical maximum effiiciency for its type due to imperfect components. Such as ordinary ohmic losses in the output transformer.
This article is quite good: http://www.audioholics.com/audio-amplifi...er-classes
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
