I've designed the following IR remote control circuit. I need to put 2 LEDs on it so I can physically, simultaneously point the remote at my wall mounted TV and my VCR, etc which is all situated much lower down.
I am planning to put these LEDs in series with no current limiting resistors given the voltage drop of 1.5V across each. I think this is more efficient than having them in parallel as each will then need a resistor.
I'm not regulating any voltage from the cells as the diagram shows. I've set the fuses on the MCU accordingly and the crystal running it is at 8MHz (not shown). I will probably turn off the brown-out detection fuse so that this can run ok as the voltage from the cell slowly depletes.
My question is, is there anything problematic with this design? Will there be any frequency related problems with running an IR remote protocol at 38kHz? Is setting up the LEDs in parallel going to give any advantage that more than offsets the power loss that would result by then having to include current limiting resistors?