I can get hold of the LT1085 and the TIP142 (Is this suitable).
If possible would someone be able to provide a basic circuit i can then expand on. Mainly the basic layout for these two components above and any more that may be needed to get some sort of working circuit.
The voltage across R1 Turn on Q1 B-E junction and Transistor Turned on.
For calculation of R1 Resistor,When you want to turn on Q1,(at desired Regulator current)
you should calculate according the equation,For example if maximum current of regulator is 3A,and
you want to turn on Q1 @ 2.5 A,and after that Q1 provide current,