Welcome to practical physicsPracticle physics - practical activities designed for use in the classroom with 11 to 19 year olds

Infra-red transmitter

To make the infrared transmitter you need

  • 75W resistor (from Rapid metal film resistor MR25 kit. 13-0270) 
  • infrared-emitting diode SFH487 (Maplin CY88V) 
  • 3 mm LED clip (JPR 850-090) 
  • socket 4 mm red (JPR 705-205) 
  • socket 4 mm black (JPR 705-206) 
  • halved square section 'plastic down pipe' approx 9 cm long (DIY store) 
  • connecting wire 

Assemble as shown in the diagram.

Infra-red Transmitter

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