(5) Light Sensitive PHOTO-TRANSISTOR - eXtreme Range - eBay (item 370273687766 end time Nov-10-09 13:51:33 PST)


This listing has ended. Item:(5) Light Sensitive PHOTO-TRANSISTOR - eXtreme Range

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(5) Light Sensitive Photo-Cells

0612

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(5) Photo-Cells / Photo-Transistors
eXtremely Wide Dynamic Range
4000:1 Dark:Light Resistance Ratio
f_c 170 kHz - suitable for IR modulation detection
Datasheet: BPW39A (391K PDF)
Auction is for lots of(5) pieces.

Use in light activating circuits.
Make an optical Theremin for
weird sci-fi audio effects. Give your robot the gift of sight.
Make an automatic light dimmer.
Use in magic tricks.

These Photo-Cells are light sensitive NPN photo-transistors. Their 170 kHz cutoff frequency makes them suitable as de-modulators for IR transmitters such as TV remote controls. The detector acceptance angle is ± 65° and the spectral range is from Green to deep Infared at half sensitivity. Actual resistance ratio depends on light levels and wavelength, applied voltage and series resistance. These variables are not critical. A good start would be 12 VDC (32 V max) applied through a 1 Meg Ohm resistor. Experimentation is necessary to achieve the maximum L/D ratio but the suggested values are easy to achieve and will give excellent results.
We used a digital ohmmeter with a 2 Meg max range to make our resistance measurements. In complete darkness, the meter went into over-range. With a bright LED, the resistance dropped below 500 Ohms. Facing the flat surface, the left lead is negative. Note: they do respond if wired backwards, but performance suffers tremendously.
If you are a musician and experimenter, build an oscillator/amp using photo-cells in the R-C timing and gain control circuits and make a THEREMIN to create those eerie wavy / warbly sounds heard in old sci-fi movies. One photo-cell to control frequency and another to control volume.

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Condition of Goods
Unless otherwise noted above:
NOS or better, clean, unused
14 day Non-DOA, Good-on-Arrival Guarantee
Untested, but NO JUNK or suspect parts
PCB parts are thru-hole, NO SMD/SMT
Small parts may be bulk shipped
Manufacturers may vary from picture

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Item location: South Central, United States

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