Audio Power Amplifier Efficiency

The class a b ab c and d amplifier designations are standardized fully defined and widely recognized.

Audio power amplifier efficiency. Output power is the second important factor to calculate the efficiency of an amplifier. It embeds 4 audio channels able to deliver a maximum power of 50 w each it can drive loads as low as 2 w and operate from 6 to 18 v without popping or interruption. Power amplifier circuits output stages are classified as a b ab and c for analog designs and class d and e for switching designs. This does give up some efficiency when operating at low levels but still ensures that the amplifier doesn t turn into a furnace when delivering large amounts of power.

It takes in a weak electrical signal waveform and reproduces a similar stronger waveform at the output by using an external power source. With a class a amp the efficiency falls with reduced power until at zero output power efficiency is 0. While not everyone will have the lab grade equipment used in this video. The image of the conduction angle derives from amplifying a sinusoidal signal.

An example of a class a b circuit left. This will give you the output power. The stpa008 is the latest automotive grade class ab analog input power amplifier of the stpa family designed to enrich the car audio listening experience. Take the formula p v 2 r where v is the output voltage and r is the resistance.

Class d is now the dominant audio amplifier approach for pc audio cards mobile devices and automotive audio systems because of its attractive combination of performance efficiency and small size. Another type of class a amplifier uses the same circuit as figure 1 but the transistors are biased to around the peak speaker current. An amplifier is an electronic device used to increase the magnitude of voltage current power of an input signal. Depending on the changes it makes to the input signal amplifiers are broadly classified into current.

Sourced from wikipedia and the emotiva xpa 1l class a b amplifier that operates in pure class a mode up to the first 35w right. Learn how to calculate the efficiency of a car amplifier in this tutorial from one of kicker s global trainers john myers. The classes are based on the proportion of each input cycle conduction angle during which an amplifying device passes current.