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how to understand the functionality of circuit

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audio:
Sir,                                                                                                   
Is there any way to include current limit indicator circuit. PFA.

xavier60:
One way is to use another BJT to sense the voltage between pins 2 and 3 with a resistor in series with the Base. The best resistor value might need to be found by testing. A 1K to start with.
The indication can never be trusted to be precise.

I guess it wouldn't hurt to drive an LED with a few mA using the REF pin as the supply.

xavier60:
There is a chance that the indicator BJT might never turn on enough. To fix it, a high value resistor might need to be connected from the REF pin to the Base of the indicator BJT.

audio:
Hi to all,

           How this circuit is having control on Current????
 
                                  R11 should be 240ohm or 120 ohm but in the circuit it is 4.7K. does this affect the q current of regulator.

          what is the function of T1,T2,T3,D8,D9 in current regulation???

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