Thanks for all these infos, skimask.

I've started a simple remote control project.

The TX side is not an issue curently.

For the RX side, I found some "old" phototransitors (could be SFH309).

The problem I see now, is the reception sensitivity.

I use my TV remote as test IR generator and can measure some signal for a maximum of 30 centimeters away from the phototransistor. above this distance, I can't se any more signal.

Is there any trick to make the receiver more "sensible"???