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Can an ir transistor(fototransistor) detect a narrow range of frequency?? Answered

i am making wireless controlled led suits for dance show so i want to know if such transistors exist

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iceng

5 years ago

YES, you can use an 8 pin IC that strobes an IR LED and reads a synced photo detector.
IF the LED pulsing matches the gated photo sensor
Then it flags a line.

Obviously this ignores stage lights even if they are incandescent IR sources.
Further adding a FET gain stage the IR strobe can drive a power IR LED and
the Si1102 can drive a detection range in meters.

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steveastrouk

5 years ago

Do you mean optical frequency (colour, Thz) or transmission frequency (Khz?

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Josehf Murchison

5 years ago

Yes IR phototransistors and Pin diodes have a frequency they work best in if you look at the datasheets in them you will find “Relative Spectral Sensitivity” graph. That is what you are looking for.

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steveastrouk

5 years ago

Yes, easily. The harder problem is getting good modulation to the SOURCE of light, if the bandwidth is wide.

Steve