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thick-film capacitor
Capacitor consisting of two thick-film layers of conductive film separated by a deposited thick-layer dialectric film.

thick film resistor
Fixed value resistor consisting of thick-film resistive element made from metal particles and glass powder.

thin film capacitor
Capacitor in which both the electrodes and the dialectric are deposited in layers on a substrate.

thin film detector
(TFD) A temperature detector containing a thin layer of platinum and used for precise temperature readings.

three phase supply
AC supply that consists of three AC voltages 120° out of phase with each other.

threshold
Minimum point at which an effect is produced or detected.

threshold voltage
For an enhancement MOSFET, the minmum gate source voltage required for conduction of source drain current.

thyristor
A term used to classify all four layer semiconductot devices. SCRs and triacs are examples of thyristors.

time constant
(t) Time required for a capacitor in an RC circuit to charge to 63% of the remaining potential across the circuit. Also time required for current to reach 63% of maximum value in an RL circuit. Time constant of an RC circuit is the product of R and C. Time constant of an RL circuit is equal to inductance divided by resistance.

time division multiplexing
(TDM) Transmission of two or more signals on the same path, but at different times.

time-domain analysis
A method of representing a waveform by plotting amplitude over time.

toggle switch
Spring loaded switch that is put in one of two positions either on or off.

tolerance
Permissable deviation from a specified value normally expressed as a percentage.

TO package
Cylindrical, metal can type of package of some semiconductor components.

toroidal coil
Coil wound on a doughnut shaped core.

transconductance
Also called mutual conductance. Ratio of a change in output current to the change in input voltage that caused it.

transducer
Device that converts energy from one form to another.

transformer
Inductor with two or more windings. Through mutual inductance, current in one winding called a primary will induce current into the other windings called secondaries.

transformer coupling
Also called inductive coupling. Coupling of two circuits by means of mutual inductance provided by a transformer.

transistor
Term derived from "transfer resistor." Semiconductor device that can be used as an amplifier or as an electronic switch.

transmission
Sending of information.

transmission line
Conducting line used to transmit signal energy between two points.

transmitter
Equipment used to achieve transmission.

triac
Bidirectional gate controlled thyristor similar to an SCR, but capable of conducting in both directions. Provides full wave control of AC power.

triangular wave
A repeating wave that has equal positive going and negative going ramps. The ramps have linear rates of change with time.

trigger
Pulse used to initiate a circuit action.

triggering
Initiation of an action in a circuit which then functions for a predetermined time. Example: The duration of one sweep in a cathode ray tube.

trimmer
Small value variable capacitor, resistor or inductor used to fine tune a larger value.

trivalent element
One having three valence electrons. Used as an impurity in semiconductor material to produce p-type material. Most commonly used trivalent elements are: Aluminum, Gallium and Boron.

troubleshooting
Systematic approach to locating the cause of a fault in an electronic circuit or system.

tuned circuit
Circuit that can have its component values adjusted so that it responds to one selected frequency and rejects all others.

tunnel diode
Heavily doped junction diode that has negative resistance in the forward direction of its operating range.

turn-off time
Sum of storage time and fall time.

turn-on time
Sum of delay time and rise time.

turns ratio
Ratio of the number of turns in the secondary winding of a transformer to the number of turns in the primary winding.

two phase
Two repeating waveforms having a phase difference of 90°.
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