How to increase IR transmitting distance?

[dhanasingaraja]

  I’m doing a bidirectional visitor counter.i m using TSOP 1738 at receiver side,and 38KHZ astable multivibrator at transmitter side.everything works fine.but it can’t work if the distance between Tx,Rx is above 8cm.It’s very short distance,so i can’t use it in real time.I picked up sony IR LED from my old TV remote.now also it can’t works for long diastance.I have attached my circuit diagram.I have used R1=1k,R2=1.394k,c=0.01up.

please…… help me!

[GANEEV SINGH]

Hi

Try working with a high output IR LED (something like this http://www.adafruit.com/product/387)

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