Epson L90P - TM Two-color Thermal Line Printer Instrukcja Użytkownika Pobierz pdf (Strona 107)

WHICH TRANSFORMER

QUIZ ANSWERS

(Quiz is on page

40)

1 -K

An

f.m.

discriminator

transformer

is

tuned

to the

i.f. frequency and provides two

180°

out -of

-phase signals which are

added to a

reference signal.

At

the

resonant

frequency,

these signals are

each 90° out of

phase

with

the

reference

signal,

but shift

in phase to

change

the

vector sum as the

f.m. carrier varies

above and

below resonance.

2 -C

A driver transformer

is used to

couple

signals to a

following amplifier

stage.

For push -

pull circuits,

the

driver

transformer

provides

two

180°

out

-of

-phase signals.

3 -A A filament transformer

reduces line

voltage

to common tube

heater

voltages such

as 12.6,

6.3 and 5.0

volts.

4 -J

A

flyback or horizontal output

transformer

is used in television

receivers

to

simultaneous-

ly produce the kinescope

second

anode

high

voltage, to match

the

horizontal

output tube to

the yoke

windings,

and to produce

a boosted

B -plus voltage.

5 -F An intermediate- frequency transformer

uses

primary and

secondary windings that are

individually

tuned

by

a sliding

iron core,

or

by

use of

compression mica capacitors.

6 -H

An

oscillator coil is actually a

transformer

(if

a two- winding

coil)

or an autotransformer

(if

a single, tapped coil) used

to provide ex-

ternal positive feedback from

the output to

input circuits

of an

oscillator.

7 -B An

output

transformer

couples

the signal

from

a power output

tube to a speaker

while

matching the high impedance

of the tube to

the low impedance

of the

voice coil.

8 -D

A pulse transformer has

a

resonant fre-

quency matched

to the

rise

time

for

the

input

pulse in order

to

couple

the signal

without

distortion.

9 -E

A quadrature

transformer in

a

color tele-

vision

circuit

receives a

3.58 -MHz

signal

from

a

local

oscillator and

provides

two 90° out

-of-

phase (quadrature) secondary voltages

to be

used as

CW reference

signals

for

the

I

and

Q

demodulators.

10 -G

A

voltage

-correction transformer has

a

tapped secondary which

enables the

output

voltage to be

adjusted

to

compensate for

changes

in line voltage.

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CIRCLE NO.

31 ON READER

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CIRCLE NO. sa

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