6AQ5A
O U T P U T
+ 3 0 0 V O LT D.C. P O W ER S U P P L Y
Figure 14
+300 VOLT DC POWER SUPPLY FOR EC-1
INITIAL CONDITION POWER SUPPLIES
The voltages for the initial conditions or the "given " quantities of the problem are supplied by
three initial condition power supplies. These use conventional half-wave re ctifie rs with OB2
regulator tubes and potentiom eters so that any voltage from 0-100 may be obtained. The sup
plies are ungrounded, making them usable for either plus or minus voltages with respect to
am plifier ground.
CONTROL CIRCUIT
While the am plifiers p erform the actual mathematical operations, it is necessary to provide
certain control functions. Before solution of the problem can com m ence, the voltage o f the
am plifier must be set to the proper value and the am plifiers must be balanced.
Provision is
made for this by means of a meter and a FUNCTION switch on the panel. By use of the FUNC
TION switch and m eter, the output of any of the operational am plifiers may also be m easu red .
An OPERATION switch turns the computer on, starting solution of the problem . A fter the prob
lem is solved, it is n ecessary to reset the computer to the starting conditions. This is a cco m
plished by setting the OPERATION switch to the RESET position, which operates a relay which
in turn rem oves residual voltages from the am plifiers and resets initial condition voltages so
that the computer is ready to again solve the problem .
REPETITIVE OSCILLATOR
Som etimes it is desirable to automatically repeat the solution a number of tim es. This is
accom plished in the E C -1 by means of a multivibrator which cy cle s the relay at an adjustable
rate of from approximately 0.1 to 15 tim es per second. In this way the effect on the solution
of changing any of the problem param eters may be observed. The rate o f repetition is changed
by a control on the panel.
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