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COMPUTER
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Donner’s Model 3500 is a full-fledged analog computer
weighing just 28 pounds. Designed for engineers, educators
Accuracy,
Convenience,
and scientists, it can be used to study almost any physical
system that can be described by differential equations. It
can be operated on desk tops and benches by anyone who
can run a slide rule. The standard 3500 contains 10 ampli-
fiers, stabalized or unstablized as the user chooses. The
Low Cost
computer performs accurately with 1% or 0.1% computin
components, and is furnished ready-to-work for $1850, de-
pending upon specific equipment desired.
This is how you use it
FOR INSTRUCTION
The Donner 3500 uses problem boards designed espe-
cially to solve problems peculiar to classroom instruc-
tion. Two such problem boards may be associated with
the basic computer through interconnecting cables
supplied with the problem boards. When so connected,
5 amplifiers terminate at each problem board, and two
student groups can simultaneously program and con-
trol their half of the basic computer without mutual
interference.
Further, possession of more than two 3530 Problem
Boards permits additional student groups to set up the
boards away from the computer and to store their pro-
grammed boards between classes for subsequent use.
Each 3530 Problem Board terminates 5 of the com-
puter’s 10 amplifiers. Three of these amplifiers may
be used as summers or integrators and the remaining
two amplifiers may be used as summers. Integrators
can be controlled in the Reset, Compute, and Hold
modes of operation from each board without inter-
fering with the adjacent group of students.
To program a problem, students merely plug molded
resistors, capacitors, and patch cords into the jacks on
the board. The amplifier designation screened on the
problem board surface Corresponds directly to the
symbolism the students use in drawing the computer
wiring diagrams. Thus, students capture a “feel” for
computer programming by directly duplicating the
programming instructions.
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5 dual amplifiers (10 channels) are mounted on plug-in printed circuit cards.
The Model 3103 Dual Amplifier provides drift-free chopper-stabilized operation.
The first 5 amplifiers may be used as integrators or summers; the remaining
5 channels as summers.
Internally regulated supplies provide all power required by 10 amplifiers. Sources
of +105 and —105 volts at 20 ma maximum load current terminate at the prob-
lem board for additive constants and initial condition supplies. A reference volt-
age of 100 volts, positive and negative, is used with the comparison Null Volt-
meter for precision voltage measurements.
Four silicon diodes are contained within the 3500 and terminate at the problem
board. Additional diodes may be obtained to plug into the problem board for
more demanding applications.
Five single turn, ungrounded potentiometers are included and may be used to
establish problem coefficients or initial conditions. Additional potentiometers
may be obtained in groups of 8 by associating Potentiometer Strips with the
3500. The Model 3570 Potentiometer Strip provides 8 ungrounded single turn
pots, and the Model 3751 contains 8 ungrounded, ten turn helical potentiometers
with digital indicating dials. One Potentiometer Strip may be mounted on the
3500 as shown. Additional strips are supplied with protective enclosures.
Precision resistors, capacitors, and patch cords must be associated with the
computer to yield a complete facility. A large variety of plug-in resistors, capac-
itors, cords, diodes, potentiometers, relays, and shunt plugs are available, either
individually or in recommended assortments.
The voltmeter located on the 3500 front panel can be switched to function as a
conventional zero-centered meter with sensitivities of 100, 30, 10, and 3 volts
full scale or as a comparison Null Voltmeter in conjunction with the ten-turn
reference pot to yield measurements within 0.25% of full scale. The meter move-
ment is protected against burnout in all modes of operation, and the metering
system may be used to measure differential voltages as well as voltages referred
to ground.
The output voltage range of each amplifier is continuously monitored, and volt-
ages exceeding +100 volts are indicated through a bank of neon indicators.
Thus, amplifier gain fall off caused by voltage saturation is instantly indicated
at the 3500 front panel.
All vacuum tubes in the 3500 are mounted on vertically oriented printed circuit
cards, and an integral muffin blower provides ample ventilation to insure long
component life, even in elevated ambient temperatures.
Two panel mounted connectors terminate all amplifier input and output leads.
Thus, amplifiers may be programmed and controlled remotely.
PROBLEM CAPACITY The complexity of a problem which can be handled by a given computer is
determined by the number of amplifiers, initial condition circuits, coefficient potentiometers, and non-
linear accessories available. The basic Model 3500 includes 10 amplifiers and 5 initial condition circuits.
Five potentiometers are included which may be used for coefficient setting or establishment of initial
conditions. Additional potentiometers may be added to the basic 3500 in groups of eight mounted on
two types of potentiometer strips.
Thus, a basic Model 3500 computer has sufficient problem capacity to permit solution of a 5th order
differential equation with initial conditions, or a seventh order equation where at least two of the initial
conditions are zero. Higher order transfer functions may be simulated. Laplace equations of the ninth
degree are readily programmed on the problem board.
SPECIFICATIONS
STABILIZED AMPLIFIERS (Model 3103)
(Measurements made at problem board)
DC gain greater than 10 million.
Offset of a unity inverter less than 0.2 mv per day.
INITIAL CONDITIONS
5 integrators are associated with initial condition sup-
plies. Two other amplifiers may be used as integrators
Drift of a unity integrator less than 0.5 mv per second.
Phase shift of a unity inverter less than 0.5° at 1 KC.
Output range of +100 volts @ 4 ma load current.
(Note: Unstabilized amplifiers (Model 3104) exhibit a
DC gain in excess of 20,000 and an inverter offset of
20 mv per day; other specifications are as above.)
REFERENCE VOLTAGE
Positive and negative source available at problem board
for additive constants.
METER
Direct ranges of +100V, +30V, +10V, and +3 volt,
full scale. Null comparison using internal reference volt-
SIZE
with zero initial conditions.
OPERATIONAL MODES
Reset, Compute, and Hold.
POWER REQUIREMENTS
115 or 230 volts (+10%), 50 to 60 cps, single phase.
inches deep.
WEIGHT
age and precision reference potentiometer measures
any voltage within +100 volt range to 0.25% and per-
mits setting or measuring coefficient potentiometers to
Net weight, approximately 28 pounds.
approximately 40 pounds.
PRICE RANGE
Basic computer 514 inches high x 19 inches wide x 12
Shipping weight,
BURLINGAME ASSOCIATES
New York City Area:
510 South Fulton Avenue
Mount Vernon, N. Y. 10550
Phone: (914) 664-7530
Boston Area:
7 Wellington Street
Waltham, Mass. 02100
Phone: (617) 894-1955
Syracuse, N. Y. 13211
106 Pickard Building
East Molloy Road
Phone: (315) 454-2408
Washington, D.C. 20014
8218 Wisconsin Avenue
Phone: (202) 654-6400
Philadelphia Area:
222 Long Lane
Upper Darby, Pa. 19082
Phone: (215) 528-6080
E. G. HOLMES & ASSOCIATES
Atlanta Area:
3667 Clairmont Road, N.E.
Chamblee, Georgia 30005
Phone: (404) 451-6161
Greensboro, N. C. 27401
430 W. Gaston Street
Phone: (919) 272-0855
Orlando, Florida 32800
316% South Bumby Street
Phone: (305) 241-2128
Huntsville, Alabama 35803
4862 Governor's Drive, West
Phone: (205) 837-6900
Gulfport, Mississippi 39501
216 - 42nd Street
Phone: (601) 864-8434
CANADA
INSTRONICS, LTD.
P. O. Box 100
Stittsville, Ontario
Phone: (613) 828-5115
SY STERLING COMPANY
Detroit Area:
21250 - 1042 Mile Road
Southfield, Michigan 48075
Phone: (313) 442-5656
Cleveland, Ohio 44128
5827 Mayfield Road
Phone: (216) 442-8080
Dayton, Ohio 45439
3300 S. Dixie Drive
Phone: (513) 298-7573
Pittsburgh, Pa. 15227
4232 Brownsville Road
Phone: (412) 884-5515
CARTER ELECTRONICS
Chicago, Illinois 60636
7203 South Western Avenue
Phone: (312) 776-1601
Indianapolis, Indiana 46224
6333 Hollister Drive
Phone: (317) 293-0696
Minneapolis, Minnesota 55431
2401 West 66th Street
Phone: (612) 869-3261
SY STERLING COMPANY
St. Louis Area:
7849 N. Lindbergh Blvd.
Hazelwood, Missouri 63042
Phone: (314) 837-1221
ARNOLD BARNES COMPANY
Dallas Area:
740 South Sherman Street
Richardson, Texas 75081
Phone: (214) 235-4541
Houston, Texas 77027
3230 Mercer Street
Phone: (713) 622-3620
San Antonio, Texas 78213
7007 Blanco Road
Phone: (512) 342-7311
Oklahoma City Area:
3510 Mockingbird Lane
Midwest City, Oklahoma 73110
Phone: (405) 737-4556
0.25%. $1850 f.o.b. Concord, California.
SYSTRON-DONNER ENGINEERING REPRESENTATIVES
Your nearby Systron-Donner Engineering Sales Rep will be glad to provide you with more information
on the lication of S-D i and systems. For your convenience, his name and address are listed below.
NORTH and CENTRAL ATLANTIC SOUTH ATLANTIC MIDWEST SOUTH WEST
PLS ASSOCIATES
Denver Area:
7895 E. Prentice Ave.
Englewood, Colorado 80110
Phone: (303) 771-0140
Albuquerque, New Mexico 87112
9611 Acoma Road, S.E.
Phone: (505) 298-5589
WARD-DAVIS ASSOCIATES
Los Angeles Area:
770 South Arroyo Parkway
Pasadena, California 91105
Phone: (213) 684-2840
San Francisco Area:
3921 East Bayshore
Palo Alto, California 94303
Phone: (415) 968-7116
San Diego, California 92110
3492 Pickett Street
Phone: (714) 297-4619
RUSH S. DRAKE ASSOCIATES
Seattle, Washington 98108
6133 Maynard Avenue, South
Phone: (206) 725-2700
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SYSTRON SS>> DONNER
= 888 GALINDO STREET +» CONCORD, CALIFORNIA
Se ee ae oe eee Phone: (415) 682-6161 + TWX 415-687-3206
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SD/USA/7-66 ® 3M PRINTED IN U.S.A,
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This is how you use it
FOR DATA REDUCTION
AND CONTROL-—
By simply removing a few screws from the top surface
of the basic 3500, the problem board and potentiom-
eter strips can be mounted in an instrumentation cab-
inet as illustrated. The complete computer with 10
stabilized amplifiers then uses only 1714 inches of
panel space.
Using drift stabilized amplifiers, precision computing
components, and ten turn coefficient potentiometers,
the 3500 meets all requirements for analog data
handling systems with precision and versatility. All
integrators may be controlled to function in the Com-
Other areas of application include:
(@) SIGNAL GENERATION. The 3500’s oper-
ational amplifiers are easily programmed to
generate sinusoidal, cosinusoidal, triangular, ramp, and
square waveforms with shape and frequency precisely
controlled through the ten turn potentiometers.
(e@) PREAMPLIFICATION. The low noise, low
it
drift, and wide bandwidth characteristics of
the 3500 computer amplifiers permit preamplification
2 pute, Reset, and Hold modes of operation either at the of low level signals directly at the source. By inter-
panel or through remotely located contact closures. connecting two amplifiers at the problem board to
Thus, the 3500 may be left unattended and automat- function as an unloading circuit, signal amplification
— ically controlled by external timing devices with input impedances in excess of 1000 megohms
: is obtained.
Equally compact and versatile non-linear accessories — 3500 i
extend the data handling capabilities to include multi- (e) eS oS a ee ee ee
simply programmed to function as a conven-
plication and function generation.
For the first time, analog signal conditioning or data
processing can be accomplished with precision by in-
cluding an off-the-shelf analog computer right into the
instrumentation cabinetry. The versatile problem board
permits the computer to be programmed on the spot
to suit the particular requirements on hand.
tional 3 mode controller with independent adjustment
of proportional, reset, and rate control. More complex
requirements for non-linear or sampled data control-
lers, and transport delay compensation, may be in-
cluded with appropriate accessories. Process engineers
are afforded the opportunity of studying and synthe-
sizing optimum controller characteristics by inserting
the computer into the control loop.
Two rack-mounted
Model 3500 computers
provide precision data
reduction or
computer-control with
versatile at-the-site
programming.
es OO000
Basie Installation
@ SELECTION A
porns solution of protee
of average complexity wit |
CHOICE OF economy, based on 1% resis-
tors. 36 patch cords, 25 resis-
1— Model 3500 j 5 aoe :
Potentiometer 1—Plug-in @ SELECTION B
versatile assortment base
Analog Computer Strip A ile a d
with 5 ) SOO Bisa oestrus) tee
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Model 3103 bees ara Selection capacitors (0.1% polystyrene).
Bist Aaeie ‘ (plug-in resistors, SELECTION C
ual Amp lers OR AND > capacitors, and patch nities of settee oobi 4
(10 chopper stabilized 1—Model 3571 cords); choice of ity. 60 patch. cords, 25 resis- }
amplifiers); all power ee iS Component Selection eee (ogy and Ts capacitors —
supplies, metering, Potentiometer A, B, C, or D (0.1% polystyrene). aS
control circuitry Strip SELECTION D =
A versatile assortment of pre- a bs
(8 ten turn cision components. 75 patch - ~
cords, 35 resistors (0.1%), 15 =
potentiometers) high-ohm resistors (1%), and ene a
13 capacitors (0.1% polysty- Poe ee
rene). ]
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ACCESSORIES
Model 3530 Problem Board
Two Model 3530 Problem Boards may be associated
with a single 3500 simultaneously by simply plugging
associated interconnecting cables into the mating con-
nectors on the 3500 front panel. When so connected,
half of the 3500’s ten amplifiers are controlled and
programmed from each problem board without inter-
ference. This permits two independent student groups
to share the 3500 without mutual interference. A
supply of more than two Model 3530 problem boards -
permits students to set up and store the programming
away from the basic computtr between classes.
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