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Please explain functionality of each part in this cicuit

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tanbakoo

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Hi every body,
This is a opamp output voltage booster schematic but I can not understand how each part work ,if any one can analysis this circuit please explain it for me in detail.

2xxv_pp.jpg
 

It is a very simple audio power amplifier circuit with a differential input. You need to learn about the basics of transistors to understand how each part works.
 
It contains sections which are typical in an op amp. As Audioguru states, it has the differential input (long-tail pair).

The rightmost two transistors are a half-bridge. This resembles the final output stage of an op amp. The correct biasing comes from the section in the center (diodes, resistors, transistor).
 

It is a very simple audio power amplifier circuit with a differential input

I know it is a power amplifier I can't analyze center part of this circuit
 

An amplifier is usually destroyed if it is playing and the output is shorted because then the output current will become much too high. Diodes D3 and D4 were added to limit the maximum output current like this:
 

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