Hi,
[...] but i have a small problem that i cant understand the values of the components of the resistors and and capacitors (the unites are not mentioned) , so please if any body can help me with that , i numbered the components in the attached circuit to make it easy for help ..
As
galantthegreat told you, the values are in ohms and µF where no multiplier is mentioned, making the one you call R6 = 680
Ohm etc. The 0.05 Ohm resistor is used in the current limiter section and it
should be 0.05 Ohm (50mOhm), which at 2.2A will develop a potential of 110mV which is going directly to the current limiter.
C1 is 0.033 µF = 33nF
C2 is 4.7µF Tantalum, but unless you can get a
dry electrolyte tantalum (they are easy discernable from electrolytes by being much heavier - don't use tantalum drop shaped capacitors, they'll die soon) a 10µF to 22µF regular electrolyte will somewhat replace it. However, tantalum is used to get a low ESR (Equivalent Serial Resistance) and since there is a 100µF cap as well, it would be better to replace these two caps with 4 x 33µF electrolytes (sharing values over more caps will lower the ESR).
The formula for selecting the resistors in the feedback loop to set the output voltage cannot be calculated without knowing what output you want. The formula is right under the schematic in the pic you posted. Values around 100kOhm for R1 is a good place to start, but you could just replace them both with a trimming potentiometer of 100kOhm to 250kOhm and adjust it to the voltage you want.
All that aside, I don't see why you would bother boosting a low power regulator when
you can just get a 3 pin (LDO if needed) regulator that can handle the current??
