Serious Help Needed-Tried a Lot & Now I am Here

[Megahertz]

Have you seen this?
http://www.doctronics.co.uk/4013.htm

Thanks Mackrackit for the link. My circuit is similar but my problem is of not knowing what component to put in place of BC547B to drive LEDs without affecting their brightness. BC547b seems for small loads upto 100mA (Source - Datasheet)