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in order to make ir rays travel longer distances from an ir led which circuit is appropriate

either a multivibrator or an oscillator circuit input which will be to an ir led

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Look at boosting your AMPLIFICATION of the return signal, rather than concentrating on the transmittter.

Think about it, a TV remote can trigger a TV at least 10 metres away.
rickharris2 years ago
The light will travel Vast distances - In a straight line.

However it will weaken by the inverse square law.

You can focus the light with a lens OR improve he sensitivity of the receiver.

sandiri (author)  rickharris2 years ago
sir but i don't have an idea regarding how should we mount a lens system
http://en.wikipedia.org/wiki/Lens_%28optics%29

As I know nothing about your set up

Your problem

Your capability I can't answer your question - You put a lens in front of the transmitter IR LED and or the receiving device How you do this depends on a lot but shouldn't be that hard.

Practice with a LED you can see so you know what is happening and search focusing light beams.
Re-design2 years ago
Neither will. Use a lens to focus the ir beam and a lens at the receiver to collect more of the beam.