50 Khz center frequency optical transmitter

Posted on Jul 21, 2012

The pulse repetition rate is relatively insensitive to temperature, and power supply voltage and is a linear function of V1N, the modulating voltage. Useful information transfer was obtained in free air ranges of 12 feet (~ 4m). Greater range can also be obtained by using a higher power output IRED such as the F5D1 in combination with the L14P2 phototransistor. Average power consumption of the transmitter circuit is less than`3 watts.

50 Khz center frequency optical transmitter
Click here to download the full size of the above Circuit.

Lenses or reflectors at the light emitter and detector increases range and minimizes stray light noise effects.

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