INFRARED SWITCH

Hello friends !
I have finally managed long range wireless remote with a range of about 15 meters ! Infra-red switch/proximity detector/obstacle detector/remote e.t.c.

CIRCUIT DISCRIPTION
Transmitter:
I have used two ic 555 both in astable mode, one is used to produce a carrier of approximately 38 KHz nearly 50% duty cycle and the second another is used to produce data signal nearly 20 Hz alternate 1 and 0
Nearly 50 % duty cycle. The output of the data signal generator is connected to the reset pin of the carrier ic producing 38 KHz carrier to produce small bursts at the rate of 20 Hz.
Receiver:
Receiver is the most important part of this chain, I have used TSOP1738 (very sensitive) as the detector, read the datasheet before using it, the TSOP1738 is immune to unmodulated carrier 38khz infra-red, hence the 20 Hz data signal is used to modulate the carrier.The output of the TSOP1738 is given to a missing pulse detector which is basically IC 555 in monostable mode having time constant 1.1RC greater than 1/20 sec
Schematics and pictures are shown below