Irda Help

[PrivateTester]

Has anyone out there has an Irda schematic diagram that doesn't use any irda transceiver like tfdu4100 or tfdu4500 and the likes?

Transceiver like mentioned above is very very hard to get/buy and the optional irda set are the led types. :'(

thanks for your future response.  :)

[Theatronics]

I don't have a schematic but I can give you a hint.
The modules usually transmit a 38-40khz signal.

the transmitter is just an IR led and the receiver is a IR sensitive Photo transistor.
An amp and a Phase Locked Loop pick up the signal from the transmitter.

The data being sent is transmitted at a very low frequency.  If you send on/off
pulses too fast you will begin having trouble with the carrier freq (38-40khz)

When set up correctly, a high signal into the transmitter will begin sending the high freq IR signal through the LED. The receiver will pick it up and output a high signal because the PLL matches the signal being sent.

Turn off the transmitter and the output of the receiver also goes low.

Hope that helps.

-Mike