TSOP1738 is Infrared IR Sensor Receiver used in IR receivers to get signals. This is because it is sensitive to 38 kHz.
Its a IR receiver with 3 pin GND, +v, Data-Out which inturn should be connected to Decoder to read the inputgenerally used in TV / DVD players
Having a built-in ir transmitter receiver is a fabulous idea
Bum hole
Infrared (IR) is a type of wave on the Electromagnetic Spectrum. Infrared is also a technology which is most popularly used in remotes. TV remotes use a IR blaster to send IR signals to an IR receiver on the television.
IR= Infrared Receiver/emiter= a technology used for wireless connection, so there is no cable for it because it uses infrared light usually invisible to the naked eye like your tv remote controller(your emiter) when you change channels you do not see the beam shooting in to your tv(your tv have the IR or Infrared Receiver).
In 1738 38 is 38mhz.
data reciver
FIXYA.com has the answer under Toshiba 36af42
To block an infrared (IR) signal effectively, you can use materials that are opaque to IR radiation, such as certain types of plastics, glass, or metal. Creating a physical barrier between the IR source and receiver can help block the signal. Additionally, using specialized IR-blocking films or coatings can also be effective in preventing IR transmission.
The 555 is a timer and oscillator chip capable of sourcing and sinking 200 milliamperes, and is useful for pulsing an infrared LED to power an infrared transmitter. It can be pulse width modulated or otherwise controlled via the various control pins. See: http://talkingelectronics.com/FreeProjects/555/555-P3.html in most cases the IR detector used is TSOP sensors which works only on a specified frequency of 38KHz. So by using 555 timer, we can design the circuit very easly to work @ 38KHz. dats why in 555 is used in many IR txns.
If you want to experiment with these, your local Radio Shack should have IR transmitters and receivers in stock.
TSOP sensor is aminiaturized receivers for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter. The demodulated output signal can directly be decoded by a microprocessor. TSOP is the standard IR remote control receiver series, supporting all major transmission codes.