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5.13 Power Transformer
The Color Computer 3 power
transformer accepts 120 VAC, 60 Hz
(240 VAC, SOHz: PAL) input and
transforms it to 16.2 VAC (18.52 VAC:
PAL) center-tapped for use by the
power supply. The current rating of
the secondary of the transformer is
AC 2.2 amps (ACl.O amps: PAL). The
transformer should only be replaced
with genuine Tandy replacement parts.
5.14
Joysticks
The optional joystick controllers are
two identical assemblies which can be
plugged into JKl and JK2. Figure 5-15
shows a schematic of the Joystick
WHITE
+5V
YELLOW
GREEN
RED
BLACK
Assembly. It simply consists of
a
push-button switch for the fire
button and the dual potentiometers
connected by a mechanical assembly.
The mechanical assembly allows both
potentiometers to be
ch~nged
at the
same time. This gives the effect of a
two-dimensional control.
The potentiometers are connected so
that 5 volts are applied to one side
of the variable resistor, and ground
is connected to the other. This
allows the center wiper to vary from
0 to 5 volts as the handle is moved.
The push-button switch merely
provides a momentary ground contact
for an input signal.
A
B
_ J _
SWITCH 2
SWITCH 1
_ l _
GND
GND
LUG
Figure 5-15. Joystick Schematic
-52-
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