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Electronics => Electronics => Topic started by: zabuza™ on June 08, 2010, 02:41:40 PM

Title: calculating values
Post by: zabuza™ on June 08, 2010, 02:41:40 PM
K so i need to find out resistor values for this circuit

http://www.reconnsworld.com/ir_ultrasonic_basicirdetectemit.html (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 (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
Title: Re: calculating values
Post by: Soeren on June 08, 2010, 03:44:00 PM
Hi,

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