Take a remote control unit (thingy) that you know works well, and at a distance of less than a foot, point it at the Thingumajig's phototransistor
. Press a button.
The machine language subroutine checked and rechecked the output from a phototransistor
at intervals of [approximately equals] 50 [micro]s.
COMPONENTS FOR A MAGNETOMETER (Radio Shack part numbers in parentheses) Item Remarks Magnetic compass Needs to have transparent housing Op-amp integrated LM-741 circuit or equivalent (276-007) Resistor 820 ohms, 1/2 watt (271-022) Resistor 4.7 megohms, 1/4 watt (can use five 1-megohm resistors, 271-1356, in series) Light-emitting diode Infrared type (276-143) Phototransistor
Infrared-sensitive NPN type (276-145) Solenoid The coil of a dismantled reed relay (about 20,000 turns of 0.06-mm wire) Rod Made of soft iron, about 50 mm long Potentiometer 10-kilohms, 15-turn type (271-343) Power supply Regulated, +15 and -15 volts DC, 100 milliamperes Circuit board (276-147) Sheets of acrylic Ideally 8 mm thick for rigidity
The team now hopes that the new phototransistor
would have thousands of applications from digital cameras, night-vision headsets, and smoke detectors to satellites, military equipment, and many other devices that are embedded with electronic light sensors.
employ the principle of photodiodes, but the amplifying action of the transistor makes these devices more sensitive.
can help in recording high definition and clearer images even in low-light conditions, according to the research paper.
The receiver part consist of a phototransistor
detector SFH 350V, a 5 V voltage, two resistors with 471[OMEGA] and headphone amplifier circuit.
Since IR emitters and receivers are used in combination, matching the wavelength of the emitter output with the peak sensitivity of the phototransistor
receiver can result in improved performance and lower power consumption.
MOC3022 and 4N35 general purpose phototransistor
optocouplers are used for isolation.
Designated the OPB733TR device, the infrared sensor uses a lensed IR LED and phototransistor
elements to collimate the light beam, giving the device an optimizing detection range from 0.4" to 1.0" (10 to 25.4 mm).
The ERT-3280 Series is a sub-miniature (2.7 mm x 3.2 mm x 1.4 mm) reflective high-speed optical sensor combining a high-output GaAs IRED with a high sensitivity phototransistor
. This sensor is designed for applications requiring a light-weight device and minimum installation space.
A standard optocoupler provides complete electrical isolation of electronic circuits from input to output while transmitting information across that electrical isolation barrier using infrared light from the phototransistor
contained inside the optocoupler.