Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A transistor that regulates current based not on an electrical signal but on the intensity of light hitting its photosensitive base.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any
semiconductor device whoseelectrical characteristics arelight -sensitive .
Etymologies
Sorry, no etymologies found.
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Examples
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To do this, we'll use an infrared emitter and phototransistor detector.
Wired Top Stories How-To Wiki 2011
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To do this, we'll use an infrared emitter and phototransistor detector.
Wired Top Stories howto_admin 2011
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FODM8801 consists of an aluminum gallium arsenide AlGaAs infrared light emitting diode optically coupled to a phototransistor.
unknown title 2011
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To make things interesting, we'll use an infrared LED and phototransistor to make the table rotate with just a wave of your hand.
MAKE Magazine 2010
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If no tube is present, the phototransistor sinks current between the dark fluid and clear fluid states.
The Gadgeteer 2010
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The presence of clear liquid causes the phototransistor to sink the maximum current, while the presence of dark liquid causes it to sink the minimum current.
The Gadgeteer 2010
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The output phototransistor features a maximum collector-emitter voltage of 24 or 30V, with collector dc current of 50mA and power dissipation to 100mW.
The Gadgeteer 2010
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Like the original OPB350 Series sensors, these devices use an LED/phototransistor to sense the change in refractive properties between full and empty tubing as it passes through the sensor housing, creating multiple output states such as "fluid present," "no fluid present," and "no tube present."
The Gadgeteer 2010
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When the system calibrates the sensor, it raises the current through the LED from 0mA to 14mA, until the phototransistor reaches the preset point.
The Gadgeteer 2010
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The OCB350 Series sensor consists of an infrared LED and phototransistor packaged in an opaque plastic housing that enhances ambient light rejection.
The Gadgeteer 2010
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