Epson L90P - TM Two-color Thermal Line Printer Manual de usuario Pagina 91

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associated
with the
acoustic
wave
penetrates
the
semiconductor material
and provides a
transfer
of energy.
Diffused silicon planar epitaxial
power
transistors
with 100 -watt,
100 -volt ratings
and
fT specifications up to
40
MHz
are now
available
from
Fairchild
Semiconductor
(313
Fairchild
Dr., Mt. View,
Ca. 94040).
The de-
vices
are offered
in complementary
versions,
with
the npn
units identified
as
types
2N5288
and 2N5289,
and
the pnp units
as
types 2N5290 and 2N5291.
Engineer's
Transistor Guide.
One
of the
biggest
problems
facing most circuit design
engineers
is choosing a semiconductor. Mak-
ing
a selection
from the
over
65,000
"stan-
dard"
devices now available can tax even
the
best minds. Texas
Instruments
Elec-
tronic
Devices
Division decided to put
its
Fig.
5.
R.f. power
transistors
have
new
geometry to
carry
overloads
en-
countered
in
VHF
transmitters.
Rat-
ings
are
12.5 or
28
volts,
3 to
22 W.
EMITTER
CONTACT
BASE
CONTACT
DRAKE
-SW4A
DIRECT FREQUENCY
DIALING
International
Short-Wave
Broadcast
RECEIVER
No more guesswork
in identifying
stations.
Set
dial
at a
station's
frequency
and if
conditions
permit
you'll
hear
it everytime
...
Ultra- precision tuning dial
accuracy, SW
and standard
AM
Broadcast
Crystal
lattice filter for
adjacent station rejection
and
good
AF response
Dual
conversion Solid state AF output
S -meter
Preselector gives
superior sensitivity by peaking
antenna and
RF
stages
Crystal-
controlled
H.
F. Oscillator stability Amplified AVC
constant
AF output
Price
$299.00
Write
for free Brochure
P -49
R.
L.
DRAKE COMPANY
Miamisburg,
Ohio
45342
CIRCLE NO.
11
ON READER SERVICE PAGE
April, 1969
99
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