1
20 K£2 (0.02 megohm) resisto r
1
200 K£2 (0.2 megohm) resisto r
1
500 Kfi (0.5 megohm) resisto r
1
2 megohm resisto r
1
5 megohm resisto r
4
10 megohm re sisto rs
The r e sisto rs should preferably be 1% tolerance, but 5% or even 10% re sisto rs w ill be sa tis
factory for demonstration purposes. The potentiom eters can be of the ordinary radio type.
Silicon diodes are furnished with the com puter. In addition to the above components, it is
n ecessary to set up a phase shifter to produce the Lissajous pattern which simulates the ball.
The parts required for the unit are:
1
6.3 V filament transform er (current rating not
important but must have center tap)
2
10 Kf2, 1/2 watt re sisto rs
2
25 Kf2 controls
1
0.1
M-fd, 150 volt capacitor
1
1.0 jufd, 150 volt capacitor
2
100 K£2 controls
1 0 5 -1 25V
5 0 - 6 0 "
C Y C L E -
^
B A L L S H A P E s ^
2 5 K
2 5 K
Figure 36
PHASE SHIFTER FOR BOUNCING BALL PROBLEM
These components are standard radio components. The capacitors may be paper or plastic
tubular. The com plete diagram fo r the problem , including the phase shifter, is shown in Fig
ure 38. Any good DC o scillo sco p e may be used for observing the motion of the ball. The Heath
DC O scilloscop e is especially suitable for use with the EC-1. The sweep circu it in the o s c il
loscope is not used, as the sweep voltage is provided by the com puter. Solution is shown in
Figure 37.
I f y / V w
Figure 37
BOUNCING BALL PROBLEM AS SHOWN ON OSCILLOSCOPE
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