Play Meter

Issue: 1981 May 01 - Vol 7 Num 8

Gottlieb tags new team
NORTHLAKE, 111.-Major additions
and realignment of personnel as well
as projected expansion into new
product lines have been announced
by D. Gottlieb & Co .
The personnel moves were aimed
at strengthening the company's
product development and marketing
capability, said Robert W. Bloom,
president of the amusement games
manufacturer.
Gilbert G . Pollock, formerly vice
president/ operations, becomes vice
president/ product design for
Gottlieb .
C . Marshall Caras, veteran coin
machine industry sales executive,
becomes vice president/ marketing,
a position he formerly held with
Gottlieb in 1977· 78.
Howard Rubin, marketing and
product development specialist who
has been affiliated with Atari , Inc. on
both coasts during the past four
years, becomes vice president/ pro·
duct management.
Bloom, in commenting on the ap-
pointments, said: "As a company
grows and expands its product lines,
the need for fresh, innovative talent
as well as more vertical specializa·
tion becomes evident . As the
industry knows, we have recently
changed from a single -product
Pollock
Caras
games manufacturer to a multi·
product company with the addition
of our line of video games- and we
are considering expansion in other
directions. These appointments will
add immeasurably to our product
and sales potential for the future.
It is a great personal pleasure for
me to be able to welcome Marshall
Caras back to Gottlieb where we
pre-viously worked together in such
a satisfying relationship," Bloom
continued.
"Marshall, having been a
prominent distributor himself,
knows the business from both sides
of the desk, and I know that our
distributing organization will
welcome the understanding and skill
that he brings to our prime
marketing position.
"Howie Rubin gained my respect
as a knowledgeable industry figure
from the first time we became ac·
quainted. His knowledge and ex·
perience will enhance Gottlieb's
ability to develop and bring to the
market outstanding amusement
games," said Bloom.
"Gil Pollock has been concentra·
ting on the area of product design for
several months, and the success of
his effort will soon be apparent. His
new position is designed to relieve
him of the former administrative
responsibilities to assure the
continued momentum and direction
he has established in Gottlieb
product design."
In addition to these appointees,
Art Strassenberg, director of
manufacturing, and Dick Finger,
director of engineering, will repoi L
directly to Bloom, he said. "Vice
President Tom Herrick, also
reporting to me, will continue his
activities in the field of market
research, promotion, advertising,
and public relations and will assist
Marshall during this period of
transition," he added.
"The net result of these appoint·
ments and changes," concluded
Bloom, "is to considerably
strengthen our product develop·
ment and marketing teams. It should
be apparent to even a casual
observer of the industry that
Gottlieb is going to be heard from in
1981."

Top officers appointed at Bally
CHICAGO - The elections of
James M. Rochford and Walter
Wechsler to Bally Manufacturing
Corporation's board of directors
were announced recently by Robert
E. Mullane, chairman of the board
and president.
Rochford has been vice president
of corporate affairs and government·
al relations for Bally Manufacturing
since April of 1980. He has served as
vice president of corporate security
since 1977.
Wechsler has been a member of
the board of directors of Bally's Park
Place, Inc. subsidiary and a member
of its audit committee since the
casino/ hotel opened in December of
1979.
In announcing the appointments,
Mullane said, "Bally Manufacturing
is extremely fortunate to have the
knowledge and experience of Jim
Rochford and Walter Wechsler on
its board of directors. Each will
provide an integral and specific new
PLAY METER, May 1, 1981
dimension to the corporation's
planned growth and development."
Prior to his current position,
Rochford, a career law enforcement
official, was superintendent of the
Chicago Police Department from
November, 1973 to October, 1977.
Wechler has been a government
official in the State of New Jersey,
holding the office of controller of the
treasury and budget director, and in
this capacity served as chief fiscal
officer responsible for developing the
state's fiscal plan. Wechsler also
serves as a director of the United
States Savings Bank of Newark, and
a director of Yates Industries, Inc. of
Bordentown, New Jersey.
Wechsler will continue as a
member of the board of directors of
Bally's Park Place, Inc.
Bally VPs named
Jerry A. Blumenshine and William T.
O 'Donnell, Jr. have been appointed
as vice presidents of Bally
Manufacturing Corp.
Blumenshine will continue in his
position as corporate controller, a
post he has held since 1974.
O 'Donnell, Jr. will also continue as
president of Bally's Pinball Division,
a position to which he was appointed
in 1979.
Announcing the appointments,
Chairman and President Robert E.
Mullane said, "Their loyalty and
dedication to our company have
proven highly valuable to our
corporate development, and I
greatly look forward to many more
years of their association with Bally."
Blumenshine, prior to entering his
current post, served as assistant
corporate controller from 1972
through 1974. A certified public
accountant, he was previously
employed by Arthur Young & Co.
O'Donnell, who has been with the
company since 1971, was Bally's
European director of marketing until
his most recent appointment as
president of the Pinball Division.
11
Digital Circuit Design Course
LESSON 5:
Emitter Follower Design
Editor 's Note : The material below is a serialization of the Kurz Kasch correspondence course for electronics, designed
spec ifically for the coin -operated amusemen~ industry. Th is course is copyrighted and. owned_ by Kur~ K_asch of f?ayto n,
Oh io and its reprinting is being sponsored jotr_Jtly by Kurz Kasch and Play Meter magaztne. Th1s matenal 1s authonzed fo r
publication exclusively by Play Meter magaztne.
The operation and design of
emitter followers is the topic of
this lesson . The circuit is
analyzed· both mathematically
and graphically.
Definition: An emitter follower. or
common collector circuit, is a
circuit configuration in which the
output is from the emitter to
ground. In the case of the
inverter, or common emitter
circuit of Lesson Four, the output
was taken from the collector to
ground . The emitter follower is
used primarily as a current ampli-
fier. It is used in digital circuits to
drive high current devices, such
as lamps and relays , and also to
drive low impedance trans-
mission lines.
Emitter Follower Operation:
Figure 5-1 is a schematic diagram
of an emitter follower. Notice that
the collector is connected
directly to Vee and the resistor
connecting the emitter to ground .
The input to an emitter follower is
from base to ground, and the out-
put is from emitter to ground. The
circuit operates as follows:
During time, t less than 0, the
input is at a low level (OV). the
base is then zero biased, and the
only current flowing is the
leakage current. The leakage
current is too small to cause a
voltage drop across RE worth
accounting for; therefore, all of
the voltage is across the transis-
tor, collector to emitter. This
operating condition is graphically
shown at point A on the emitter-
follower load load line of fig. 5-2.
At point A, VeE is approximately
equal to Vee and le is ap-
proximately zero. Because all of
the voltage is across the transis-
tor, the voltage across RE must
then be zero .
12
The base-emi tter diode will begin to
forward bias at the knee in the curve
of fig . 5-2, and this point is termed
VB E(cu tin). As a general rule-for
silicon transistors VBE(cutin ) = 0.5 V
and for germanium transistors :
= 0 .1
VBE (cut in)
V.
- \ c;c
IIIIHII
II\ ~ J
I • II
Our pol
~v"
ov 1· 0 1 -
F ig . 5· 1. An em iUtr fo llower chc~o~l t . The Input and output
w avef orms are In phase .
.
~
~
\,._,lJ
"•
At t = 0 the voltage [Vin] rises from
OV to a level high enough to
forward-bias the base emitter
diode, a current begins to flow in
the emitter circuit [IE]. IE causes
a voltage drop across RE which
subtracts from VeE. The voltage
dropped across RE will continue
to rise with the input voltage and
continue to subtract from
VeF. Let us assume that Vin has
risen to Vin3 . This operating
condition is represented at point
B. Projecting the voltage inter-
cept, we find that VeE has de-
creased and that VE has in-
creased proportionately . The
current le can be found by pro-
jecting the current intercept.
Also , notice that le has increased .
When the input rises to the steady
voltage V, the emitter voltage will
also reach a steady state voltage.
This operating cond ition is
shown at point C. Notice that VE
has risen to almost Vee and that
VeE is almost zero. The steady
state voltage across the em itter
resistor [VE] will be equal to the
input voltage minus the voltage
base to emitter, or
VE
\ f' .. 0
\ Ct-: • 0
F ig . 5·2. The family of Input -out put t tates fOf an emi tter ·
foll ower . The output voltage W i ng the Int ercept of the load
lint wllh a partlc u ler V 111 cwrve .
VE
O urpul
Fie. 54. Aneqw lvel"t c lreu lt of tM Input circu it of en tm l lttr·
follower . The output volt ... le Ye t: Ieee t"-n the Input volta .. .
= Vin -VBE
An equivalent circuit of the
base-emitter relationship is
shown in fig . 5-3. The diode
represents the base-emitter
diode. This illustrates clearly why
the o·utput voltage is VBE less than
the input voltage.
Also, note from fig. 5-1 that the
input and output voltages are in
phase.
Collector Dissipation:
Because the transistor is
basically a resistive device, as
current flows there will be dissi-
pation and , therefore, heat. The
effects of heat regarding VF and lA
fora diode and regarding leo fora
PLAY METER, May 1, 1981

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