Infra Red (IR) Transmitter (Tx)

This Semiconducting device can emit infra red light that is invisible to humans.

CH10 refers to the Maplin Electronics part number, or Tesco's part no 648-9497

side looking Infra Red Emitter IR908-7C-F made from GaAlAs

Maximum forward current for the diode is 100mA continuous, 1A peak (300pps, 1uS pulse).

Luminous intensity is 1.8mW at IF=50mA, with a 30° viewing angle.

940nm

Forward Voltage - 1.2V - 1.5V

Short pin is the Collector (Cathode) (connects to -ve)

long pin is the Emitter (Anode) (connects to +ve)

Emitter (IR Tx)

Forward voltage will be around 1.5V so to limit the current use a resistor of around 68-100 ohms with a 5V supply

you should be able to use a video camera to view the infra red output

1A peak (300pps, 1uS pulse) means that you can transmit a 1 micro Second pulse of data at a current of 1 amp up to 300 times every second without over heating or damaging the emitter, this will enable increased range/higher intensity.

At the side of the device is a small lens that focuses the beam emitted to around 30 degrees.

Rx and Tx

Use with CH11 IR Rx Phototransistor

CH11M =

PT5529B? 940nm or PT908-7C?

Phototransistor VCEO is 30 Volts, with a max dissipation of 100mW. Light IC = 20mA max and dark current is 100nA max, viewing angle 70°, rise/fall times=5uS @ RL=1K.