18WuD2x

506 output-transformerless • overdesign
output-transformerless Abbreviation, OTL. Pertaining
to an oscillator, amplifier, or generator
that requires no output coupling transformer.
output transistor A transistor in the final stage of
an amplifier or generator; usually, it is a power
transistor.
output tube A vacuum tube in the final stage of an
amplifier or generator; usually, it is a power tube.
output unit See OUTPUT DEVICE.
output voltage 1. Symbol, E o or V o . The voltage delivered
by a source, such as a battery, generator,
or amplifier. Compare INPUT VOLTAGE, 2. 2.
Symbol, E o or V o . The voltage across the output
leg or electrode of a circuit or device. Compare IN-
PUT VOLTAGE, 2.
output voltage compliance In an integrated circuit,
the voltage range over which the output can
be made to swing, while keeping the operation of
the circuit within a certain maximum allowable
nonlinearity limit. It is measured in volts or millivolts.
output voltage noise In an integrated circuit, the
output noise over a given range of frequencies, as
measured in peak-to-peak millivolts or microvolts.
It can also be measured as the rootmean-square
(rms) value.
output voltage swing In an integrated circuit with
a specified load, the output-voltage change measured
as a difference between maximum and
minimum in volts or millivolts.
output voltage tracking For an integrated-circuit
dual regulator, the difference between the absolute
values of the output voltages of a dual regulator.
It can be expressed as a specific voltage or
as a percentage of the specified output voltage of
the device.
output winding The secondary coil of an output
transformer.
outside antenna See OUTDOOR ANTENNA.
outside booster See OUTDOOR BOOSTER.
outside diameter Abbreviation, OD. The outermost
diameter of a body or figure having two concentric
diameters (e.g., tubing or conduit).
Compare INSIDE DIAMETER.
outside lead See FINISH LEAD.
outside transformer 1. See OUTDOOR TRANS-
FORMER. 2. A transformer mounted outside of
an equipment in whose circuit it is included.
External mounting can eliminate hum in the
equipment circuit, and can help to prevent
overheating.
oven 1. Also called crystal oven. A chamber providing
a closely controlled operating temperature for
an electronic component, such as a quartz crystal.
2. An enclosure in which electronic equipment
can be tested at selected, precise high
temperatures. Compare COLD CHAMBER.
overall feedback Positive or negative feedback
around an entire system (such as a publicaddress
system), as opposed to feedback confined
to one stage or a few stages within the system.
overall gain The total gain of an entire system
(such as a multistage amplifier), as opposed to
that of one or several stages.
overall loudness The apparent intensity of an
acoustic disturbance, generally measured with
respect to the threshold of hearing, and expressed
in decibels, relative to the threshold level.
overbiased unit A component, such as a transistor
or vacuum tube, whose bias current or voltage
is higher than the correct value for a given mode
of operation. Compare UNDERBIASED UNIT.
overbunching In a velocity-modulated tube, such
as a Klystron, the condition in which the buncher
voltage exceeds the value required for optimum
bunching.
overcharging In a secondary cell or battery, the
application of charging current longer than necessary
to obtain full charge. This can sometimes
cause problems, such as cell heating.
overcompounded generator A dynamo-type generator
having a compound field winding in which
the series-field winding increases the field intensity
beyond the point needed to maintain the output
voltage. Compare UNDERCOMPOUNDED
GENERATOR.
overcompounding A characteristic of electromechanical
motors, resulting in increased running
speed with decreasing load resistance.
overcoupled transformer A transformer having
greater than critical coupling between its primary
and secondary windings. In tuned circuits, such
as intermediate-frequency (IF) transformers, this
produces a double-peak response.
overcoupling Extremely close coupling (see
CLOSE COUPLING).
overcurrent A current greater than the specified,
nominal, or desired level. Compare UNDERCUR-
RENT.
overcurrent circuit breaker A circuit breaker that
opens when current exceeds a predetermined
value.
overcurrent protection The use of a circuit
breaker, relay, or other device to protect a circuit
or system from damage resulting from an excessive
flow of current.
overcurrent relay A protective relay that opens a
circuit when current exceeds a predetermined
value. Compare UNDERCURRENT RELAY.
overcutting In disc recording, the condition in
which an excessively high amplitude signal
causes the stylus to cut through the wall between
adjacent grooves. Compare UNDERCUTTING.
overdamping Damping greater than the critical
value (see DAMPING ACTION, 2). Compare UN-
DERDAMPING.
overdesign Also called overengineering. 1. To use
an unnecessarily high safety factor in the design
of equipment. 2. To design equipment for performance
superior to that which is required in the
intended application. 3. A design that results
from operations defined in 1 and 2.