I am trying to manufacture strobe lights for some purpose which has to be as cheap as possible.. The cheapest thing which can be done is with 2 bc 547 transistors..
But the problem is I want it to blink twice.. that is 30ms-ON 30ms-OFF 30ms-ON 100ms-OFF that will be O O O O O O O O
so for this I thought using a 555 and a cd4017...
In what other cheapest way can it be done so that I can make little more profit and bring the cost down little more..