Thanks for the replies.
And yes Bullet.., you are right; In digital-electronics high and low can merely differ by small unit of voltages.
and I till date have never used the LDO regulators, need to have a look at those.
I was disappointed in one of my approaches to make a digital switch, where i used a NPN transistor with 5vdc from Collector and 3.45 vdc from arduino to BASE, i had my load at the emitter, i did manage to get a good amount of current but the voltage was still not to my expectation, then i tried cascading more than one of these transistors but every time the voltage was disappointing, and my relays won't respond.
Anyways I'll try the LDO regulators now, consequently if anyone of you more experienced ppl out there, have any other ideas please enlighten me.
Thanks All, Thanks a lot.
regards,
BlueRat.