I’m trying to build a simple IR tranmitter/reciever. The DIY kits are too big for my application. Any tips?

The transmitter is not as big as the reciever though. This has to fit on a motorbike brake lamp and I’m trying to reduce its size. What’s the simplest way to make a 12V IR tranmitter and reciever?

This is about as simple as it gets:
http://www.aaroncake.net/circuits/irremote.asp
OK, they are not for 12 Volt, but if you are smart enough to build these, then you should also know how to make it work at 12V.

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