thanks ante ur too good man. one more help i needed here. iam connecting this power supply (3v 200ma from a 12v 2.5A lead acid battery) to a RF transmitter.is it ok imean as this circuit uses inductor this might effect the RF. so what is ur openion.is it ok to go with MAX724 or LT1074 or linear type regulators imean lm317,L200 etc