calculating values

[zabuza™]

K so i need to find out resistor values for this circuit

http://www.reconnsworld.com/ir_ultrasonic_basicirdetectemit.html

on these datasheet values

http://docs.google.com/viewer?a=v&q=cache:4VxsHDzG5gsJ:www.fairchildsemi.com/ds/QR%252FQRD1114.pdf+qrd1114&hl=en&gl=uk&pid=bl&srcid=ADGEEShRa6Z8fwCuVthcWkpm9DDsCT8n4ZIT5Q7nZAjcl82WWaaTemYYl9mVXL5dOFkSLvPNj18DyKF-cPB9kKvGQ-hQHcRNzfMARse8BLN4Xt3q0gYt9OhAxWMonNNq4gl-EZe7QznB&sig=AHIEtbRdJKKzdD9XqLrjIq5m69rTG-vLwQ

i found the led resistance but need help with the phototransistor values

[Soeren]

Hi,

Why not go with the values in the schematic to start off?