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P

PHASE SPLITTER

A device that provides two output signals from a single input signal. The two output signals differ from each other in phase (usually by 180 degrees) [8].


PHASE-SHIFT DISCRIMINATOR

See FOSTER-SEELEY DISCRIMINATOR [12].

PHASE-SHIFT KEYING

Similar to ON-OFF cw keying in AM systems and frequency-shift keying in
FM systems. Each time a mark is received, the phase is reversed. No phase reversal takes place when a space is received [12].


PHOSPHOR

The material used to convert the energy of electrons into visible light [6].

PHOTOCELL

A light-controlled variable resistor which has a light-to-dark resistance ratio of 1:1000. Used in various types of control and timing circuits [7].


PHOTODIODE

A light-controlled PN junction. Current flow increases when the PN junction is exposed to an external light source [7].


PHOTOELECTRIC VOLTAGE

A voltage produced by light [1].

PHOTOETCHING

Chemical process of removing unwanted material in producing printed circuit boards [14].


PHOTOTRANSISTOR

An optoelectronic device that conducts current when exposed to light. Produces more current and is much more sensitive to light than the photodiode [7].


PHOTOVOLTAIC CELL

(SOLAR CELL)—A device that acts much like a battery when exposed to
light and converts light energy into electrical energy [7].



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